CN109754597B - Urban road regional congestion regulation and control strategy recommendation system and method - Google Patents
Urban road regional congestion regulation and control strategy recommendation system and method Download PDFInfo
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Abstract
The application provides a system and a method for recommending urban road regional congestion control strategies, which are used for identifying the space-time relevance between intersections and forming congestion groups; carrying out priority ordering on intersections in the congestion group, taking the intersection with the highest priority level as a key intersection, searching upstream and downstream intersections of a space-time related road section of the key intersection, and providing intersection regulation and control sequence recommendation; decomposing the regulation and control target of the key intersection into each intersection of the congestion grouping, and providing intersection regulation and control target recommendation; and providing corresponding regulation and control measure recommendation according to the congestion grouping characteristics. The method and the device have the advantages that the regulation and control strategy can be pushed quickly and in real time, and the efficiency of setting the regulation and control strategy by timing personnel is improved.
Description
Technical Field
The invention relates to the field of traffic control, in particular to a system and a method for recommending an urban road regional congestion control strategy.
Background
The urban road traffic trunk line supports the whole urban road network, and the intersection is used as a joint for connecting the trunk line, and whether the intersection is smooth or not directly influences the operation of the road network. If the traffic congestion condition is generated due to insufficient traffic capacity of a certain intersection, the traffic flow is accumulated, the congestion can spread to the periphery, and more intersections are congested.
At this time, a regional congestion situation is observed on the map, and a set of a series of congested intersections is identified in the time and space dimensions. In the time dimension, intersections in the congestion area are at approximate time nodes; in the spatial dimension, intersections in the congestion area are connected with one another and distributed in a small range.
The intersection which has important influence on traffic jam in the urban road jam area, namely the jam group, is accurately identified, and the implementation effect of signal regulation and control in the jam area is favorably improved. The congestion grouping refers to a set of a plurality of intersections and road sections connected with the intersections, and the intersections have strong space-time relevance and a strong congestion spreading relation. The congestion group is not a fixed intersection and road section set and is changed according to the traffic congestion condition. The congestion grouping is important to be concerned by signal regulating personnel when signal timing is regulated.
The identification means for the congestion grouping in the prior art comprises the following steps: dividing based on geographical positions such as business circles, residential circles and the like; and identifying and collecting intersections with higher congestion degrees based on a clustering method. The congestion spatio-temporal correlation between intersections identified by the means is low in strength, particularly the correlation in a time dimension. The traffic jam changes in real time, and when the signal regulation and control are carried out on the identified intersections in the prior art, the adaptability to the real-time change of the jam is weak, the jam relief of a single intersection can be realized mostly, and the jam relief effect of the whole area is poor.
The existing traffic regulation and control means mainly control on site of signal timing personnel, and the traffic regulation and control has higher real-time requirement. If the congestion cannot be dredged in time, the traffic characteristics of the congestion may change, and the corresponding regulation and control strategy may not achieve the ideal effect. The urban road regional congestion control strategy recommendation system can provide control reference for signal timing personnel, and personnel control efficiency is improved.
A lot of regulation and control experiences are accumulated in daily regulation and control by timing personnel, but the manual experiences are not recorded and analyzed systematically. If the manual experience needs to be summarized, the most direct feedback is the manual operation record generated by the signal control system, and the content in the record can cover all operations of timing personnel on intersections in the congested area, so that the modeling embodiment of the manual experience is realized.
When regional congestion is met, a lot of time is spent on observing and judging the intersection only by timing personnel. If the congestion area is diagnosed and a feasible regulation and control strategy is recommended based on manual experience, reference of the regulation and control strategy can be provided for timing personnel, and the regulation and control efficiency is improved.
Disclosure of Invention
The invention provides a system and a method for recommending a congestion control strategy in an urban road area, aiming at realizing the quick and real-time pushing of the control strategy and improving the efficiency of timing personnel for formulating the control strategy.
The technical scheme adopted by the invention for solving the technical problem is as follows.
A system for recommending urban road regional congestion control strategies comprises the following steps:
the congestion grouping identification module is used for identifying the space-time relevance between intersections and intersections according to the structural characteristics and traffic flow characteristics of a road network, when the congestion grouping condition is met, the intersections and the road sections between the intersections are space-time relevance road sections, the space-time relevance road sections and the intersections at two ends are gathered to form congestion grouping, and the space-time relevance refers to the mutual influence relation of the traffic flow characteristics on time and space;
and the regulation and control strategy recommendation module is used for providing corresponding regulation and control strategies according to the structural characteristics and traffic flow characteristics of the intersections in the congestion group, wherein the regulation and control measures comprise an intersection regulation and control sequence, an intersection regulation and control target and intersection regulation and control measures.
Further, the regulation strategy recommendation module comprises:
the intersection regulation and control sequence recommendation unit is used for carrying out priority division on each intersection in the congestion group according to the structural characteristics and traffic flow characteristics of each intersection in the congestion group, extracting the intersection with the highest priority level as a key intersection, searching upstream and downstream intersections of a space-time related road section where the key intersection is located, and obtaining an intersection regulation and control sequence;
the intersection regulation and control target recommendation unit takes the regulation and control target of the key intersection as a general target according to the traffic flow direction relation and the traffic flow characteristics of the intersection and the key intersection, decomposes the regulation and control target into the regulation and control targets of each intersection in the congestion group, and the key intersection is the intersection with the highest priority level in the congestion group;
and the intersection regulation and control measure recommendation unit is used for providing corresponding regulation and control measures according to the structural characteristics, traffic flow characteristics, an intersection regulation and control sequence and an intersection regulation and control target of the intersection.
Further, the quantization method of the space-time correlation comprises the following steps: a sampling area I is defined at an inlet of an upstream road section, and a sampling area II is defined at an outlet of a downstream road section; and acquiring traffic flow characteristics of the sampling area I and the sampling area II, and calculating the time difference T when the traffic flow characteristics of the sampling area I and the sampling area II reach the congestion condition.
Further, the priority is obtained by calculation according to the topological complexity and the congestion degree of the intersection: and expressing the topology complexity by using the number of space-time associated road sections connected with the intersection, expressing the priority value by using the weighted sum value after the topology complexity and the congestion degree are subjected to standardization processing, and expressing the priority level according to the priority value.
Further, the intersection regulation and control sequence acquisition method comprises the following steps: taking the intersection with the highest priority level as a key intersection, searching a downstream intersection of a space-time related road section where the key intersection is located, wherein the downstream intersection is connected with the key intersection through 1 space-time related road section and is a level 1 downstream intersection, the downstream intersection is connected with the key intersection through m space-time related road sections and is a level m downstream intersection, the level of the intersection is selected from low to high, and the downstream intersection at the same level is selected from high to low according to the congestion degree of the intersection; searching an upstream intersection of a space-time related road section where the key intersection is located, wherein the upstream intersection is connected with the key intersection through 1 space-time related road section and is a-1-level upstream intersection, the upstream intersection is connected with the key intersection through k space-time related road sections and is a-k-level upstream intersection, the level of the intersection is selected from high to low, and the upstream intersection at the same level is selected from high to low according to the congestion degree of the intersection.
Furthermore, the regulation and control targets of the key intersection are that the traffic outflow from the key intersection to the downstream intersection of the space-time related road section is increased, and the traffic inflow from the upstream intersection of the space-time related road section to the key intersection is reduced; the intersection regulation and control target is to increase or decrease the traffic flow of the intersection to the downstream intersection.
Further, the intersection regulation measures include, but are not limited to, one or a combination of the following: modifying the split ratio of the phases in the original signal timing scheme, modifying the signal control period of the intersection, modifying the phase difference between the intersection and the intersection, turning on or off the temporary phase, and turning on or off the signal coordination control scheme.
Further, still include:
the congestion group regulation and control emergency degree identification module is used for acquiring a plurality of congestion groups in the road monitoring area, and identifying the regulation and control emergency degree of each congestion group in the current road monitoring area by utilizing the established congestion group regulation and control emergency degree calculation model according to the structural characteristics and traffic flow characteristics of the congestion groups.
A method for recommending an urban road regional congestion control strategy comprises the following steps:
1) identifying a congestion group, namely defining a sampling area I at an inlet of an upstream road section and defining a sampling area II at an outlet of a downstream road section; acquiring traffic flow characteristics of the sampling area I and the sampling area II, and calculating a time difference T when the traffic flow characteristics of the sampling area I and the sampling area II reach a congestion condition; when the traffic flow characteristics of the sampling area I and the sampling area II and the time difference T meet the congestion grouping condition, the road section is used as a space-time associated road section, and the space-time associated road section and the intersections at the two ends of the space-time associated road section are used as congestion grouping units to obtain congestion grouping units; judging whether congestion space-time association exists between different congestion group units, and collecting the congestion group units related to congestion space-time to form congestion group units, wherein the congestion space-time association means that two congestion group units share the same intersection or a road section between intersections contained in the two congestion group units is a space-time association road section.
2) And identifying an intersection regulation and control sequence, carrying out priority division on each intersection in the congestion group according to the topology complexity and the traffic congestion degree of each intersection in the congestion group, extracting the intersection with the highest priority level as a key intersection, and searching upstream and downstream intersections of a space-time related road section where the key intersection is located to obtain the intersection regulation and control sequence.
3) And identifying intersection regulation targets, namely decomposing the regulation targets of all the intersections in the congestion group into the regulation targets of all the intersections in the congestion group by taking the total target of increasing the traffic flow of the key intersections to the downstream intersections of the time-space associated road sections and reducing the traffic flow of the upstream intersections of the time-space associated road sections to the key intersections as the total target according to the traffic flow direction relation and the traffic flow characteristics of all the intersections and the key intersections in the congestion group.
4) Recommending an intersection regulation and control strategy, and providing corresponding regulation and control measures according to the structural characteristics and traffic flow characteristics of the intersection, wherein the regulation and control measures comprise but are not limited to one or the combination of the following: modifying the split of the phases in the original timing scheme, modifying the signal control period of the intersection, modifying the phase difference between the intersection and the intersection, turning on or off the temporary phase, and turning on or off the coordination scheme.
Further, the priority of step 2) is specifically calculated as follows: the number of space-time associated road sections connected with the intersection is used for representing the topological complexity of the intersection, the weighted sum value after the topological complexity and the congestion degree are standardized is used for representing the priority value, and the priority level is represented according to the priority value, wherein the standardization process comprises the following steps: x is the number of*=(x-min)/(max-min)，x*Min is the minimum parameter value and max is the maximum parameter value.
The invention has the following beneficial effects: (1) the strength of the time-space relevance of the congestion of the intersection is high, the signal regulation and control are carried out on the intersections in the congestion group, and the pertinence is good. (2) And manual operation records are utilized, so that the regulation and control strategy is closer to practical application. (3) The regulation and control suggestions are pushed quickly and in real time, and the efficiency of setting the regulation and control strategies by timing personnel is improved.
Drawings
Fig. 1 is a structure of a system for recommending a congestion control strategy in an urban road area.
Fig. 2 is a schematic of congestion grouping.
Fig. 3 is a schematic diagram of signal timing phase at intersection B in fig. 2.
Fig. 4 is a schematic diagram of sampling regions in a congestion group identification process.
Fig. 5 is a schematic diagram of a normal queuing area and an ultra-long queuing area in the congestion group identification process.
Detailed Description
A system for recommending urban road regional congestion control strategies comprises the following steps: the system comprises a congestion grouping identification module, a regulation and control strategy recommendation module and a congestion grouping regulation and control emergency degree identification module.
1) And the congestion grouping identification module is used for identifying the space-time relevance between the intersections and the road junctions according to the structural characteristics and the traffic flow characteristics of the road network, when the congestion grouping condition is met, the intersections and the road sections between the intersections are space-time relevance road sections, the space-time relevance road sections and the intersections at two ends are gathered to form the congestion grouping, and the space-time relevance refers to the mutual influence relation of the traffic flow characteristics on time and space.
The structural characteristics of the road network include, but are not limited to, one or a combination of road segment length, intersection longitude and latitude coordinates, connection relationship between road segments and intersections, and position information on an electronic map. Traffic flow characteristics of a road network include, but are not limited to, one or a combination of average traffic speed, congestion index, flow, saturation, flow rate, real-time traffic capacity.
The congestion grouping refers to the aggregation of a plurality of intersections and road sections connected with the intersections, the space-time relevance between the intersections is strong, and a strong congestion spreading relation exists. The congestion group is not a fixed intersection and road section set and is changed according to the traffic congestion condition. The congestion group represents a severe congestion area, which is important to be paid attention by signal timing personnel, and signal timing regulation and control are performed on intersections in the congestion group, so that the traffic congestion condition of the area can be relieved in a targeted manner.
The congestion group identification method may be various.
1.1) in one implementation mode, through manual selection, signal timing personnel can manually identify the space-time relevance between intersections and road sections according to the structural characteristics of a road network and the characteristics of real-time traffic flow, and the signal timing personnel select the intersections and road sections according to the judgment of experience to form congestion groups. The space-time relevance between the intersections can be quantified according to the structural features and the real-time traffic flow features of the road network, and corresponding congestion grouping conditions can be set according to actual regulation and control purposes, wherein the congestion grouping conditions are not unique. And when the congestion grouping condition is met, the intersections and the road sections among the intersections are gathered to form the congestion grouping.
1.2) in one embodiment, intersection and intersection spatiotemporal relevance are quantified in both temporal and spatial dimensions.
A) And extracting traffic flow characteristic tracking conditions of other road sections and the initial congestion road section from time. Due to the structure of the road network and the irreversibility of the traffic flow direction, the traffic jam spreads from the initially jammed road section to the adjacent road sections. And drawing a time-traffic flow characteristic relation of the initial congestion road section and other road sections in a sampling time period, extracting a time difference when the initial congestion road section and other road sections reach a certain traffic flow characteristic value, and counting the time difference so as to quantify the time-space relevance of the intersection and the intersection in a time dimension. Statistical means include, but are not limited to, addition, subtraction, multiplication, division, power, similarity calculations.
Referring to fig. 2, an average driving speed is used as one of traffic flow characteristics, the size of the average driving speed reflects a congestion degree of a link, and the congestion degree of the link is divided into nmaxStage, when n is reachediThe road section is a congestion road section at the time of level, T is a set sampling time period, and the congestion degree of the road section L2 (B-C) reaches n at the time of T1iAnd level, which is the initially congested road segment. The congestion spreads to other links L1 (A-B), L3 (C-D) and L5 (D-E), and the congestion degree of other links is extracted to reach niThe time of the grade is t2, t3 and t4 respectively, and the congestion degree of the road section reaches niThe time difference of the stages is t2-t1, t3-t1 and t4-t1 respectively; extracting the congestion degree of the initially congested road section and other road sections to njThe time of the grade is t5, t6, t7 and t8 respectively, and the road congestion degree reaches njThe time differences of the stages are t6-t5, t7-t5, t8-t5 respectively.
The time difference is counted, and the statistical means includes but is not limited to addition, subtraction, multiplication, division, power, and similarity. The space-time relevance of the intersection and the intersection in the time dimension can be quantified as ft (L2-L1) = t2-t1, ft (L2-L3) = t3-t1, ft (L2-L5) = t4-t 1; the quantitative ratio can also be ft (L2-L1) = (t2-t1) + (t6-t5), ft (L2-L3) = (t3-t1) + (t7-t5), ft (L2-L5) = (t4-t1) + (t8-t 5); it can also be quantified as the similarity of the time difference, the similarity is calculated by cosine function, ft (L2-L1) = (t2-t1) = (t6-t5)/((t2-t1)2+(t6-t5)2）1/2Ft (L2-L1) represents the spatiotemporal relevance of road segment L2 and road segment L1 in the time dimension, reflecting the spatiotemporal relevance of intersection A, B, C in the time dimension.
| L2（B-C） | L1（A-B） | L3（C-D） | L5（D-E） | |
| t1 | ni | |||
| t2 | ni | |||
| t3 | ni | |||
| t4 | ni | |||
| t5 | nj | |||
| t6 | nj | |||
| t7 | nj | |||
| t8 | nj | |||
| … | ||||
| t1+T |
B) The space-time relevance quantification of the intersection and the intersection in the space dimension can adopt one or a combination of the following methods: the position distance between the intersections, the connection relation between the intersections and the upper and lower parts of the road sections between the intersections, and the average driving distance of the same vehicle captured between the intersections. Combining means include, but are not limited to, addition, subtraction, multiplication, division, and exponentiation.
Referring to FIG. 2, the intersections A, B, C, D, E are located at positions A (x)A,yA)、B(xB,yB)、C(xC,yC)、D(xD,yD)、E(xE,yE) The spatiotemporal relevance of the intersection and the intersection in the spatial dimension can be quantified as fs (a, B) = ((x)A-xB)2+(yA-yB)2)1/2。
The space-time related road sections of the intersection and the intersection are respectively L2 (B-C), L1 (A-B), L3 (C-D) and L5 (D-E), wherein L2 (B-C) represents that the intersection B and the intersection C are an upstream intersection and a downstream intersection of the space-time related road sections, a numerical value R represents the connection relation between the intersection and the intersection between the upstream and downstream roads, R is the minimum number of the roads passing from one intersection to the other intersection, and the space-time relevance of the intersection and the intersection in the space dimension can be quantized to fs (A, B) =1, fs (A, C) =2 and fs (A, D) = 3.
The intersection A, B captures the vehicle information of a certain vehicle in sequence, the running distance of the vehicle is obtained by multiplying the time difference delta T of the sequential capture by the average running speed of a road section L1 (A-B) in delta T, and the average running distance S of the same vehicle captured between the intersection A and the intersection B is obtained by averaging the running distances of a plurality of vehicles captured by the intersection A, B in a set sampling time period TABThe space-time relevance of the intersection and the intersection in the spatial dimension can be quantified as fs (A, B) = SAB。
The congestion grouping condition is as follows: the crossing and the spatial and temporal relevance of the crossing in the spatial dimension and the spatial dimension respectively meet the set time relevance threshold and the set spatial relevance threshold. Referring to fig. 2, intersection A, B, C and links L2, L1 form a congestion group when a spatiotemporal correlation Ft (L2-L1) > Ft of link L2 and link L1 in a time dimension, a spatiotemporal correlation Fs (a, B) < Fs of intersection a and intersection B in a space dimension, and a spatiotemporal correlation Fs (B, C) < Fs of intersection B and intersection C in a space dimension. Ft is a set temporal correlation threshold, and Fs is a set spatial correlation threshold.
The congestion group condition may further include a structural feature condition for forming a congestion group, including a connection relationship between intersections and intersections, and a topological structure condition that the number of intersections satisfies the congestion group, such as limiting the number of intersections in the congestion group to be not more than n.
The congestion group conditions may also include traffic flow characteristic conditions that form congestion groups, such as an average travel speed of the intersections A, B, C that form congestion groups being greater than a set threshold.
1.3) in one embodiment, extracting congestion spreading characteristics between intersections, wherein the congestion spreading characteristics integrate space-time relevance in time dimension and space dimension.
A sampling area I is defined at an inlet of an upstream road section, and a sampling area II is defined at an outlet of a downstream road section; acquiring traffic flow characteristics of the sampling area I and the sampling area II, and calculating a time difference T when the traffic flow characteristics of the sampling area I and the sampling area II reach a congestion condition; when the traffic flow characteristics and the time difference T of the sampling area I and the sampling area II meet the congestion grouping condition, the road section is used as a space-time associated road section, and the space-time associated road section and the intersections at the two ends of the space-time associated road section are used as congestion grouping units to obtain the congestion grouping units; judging whether congestion space-time association exists between different congestion group units, and collecting the congestion group units related to congestion space-time to form congestion group units, wherein the congestion space-time association means that two congestion group units share the same intersection or a road section between intersections contained in the two congestion group units is a space-time association road section. Namely, the road sections between any two adjacent intersections in the congestion group are all space-time related road sections.
Referring to fig. 4, a section L1 (a-B) indicates that intersection a is an intersection at the entrance upstream of section L1 (a-B) and intersection B is an intersection at the exit downstream of section L1 (a-B). Usually, the position close to the intersection is influenced by intersection signal lamps, the running speed of the vehicle passing through the intersection fluctuates greatly, the sampling area I and the sampling area II are defined in an area with stable running speed of a road section, the area with large running speed fluctuation of the vehicle is avoided, and data sampling is relatively accurate. The sampling region I is defined in a section from the intersection Lu to the Lu + Ld at the upstream, and Lu and Ld are distance lengths. The sampling area II is an ultra-long queuing area, and the ultra-long queuing area is an area adjacent to the normal queuing area Lx.
The normal queuing area Lx acquiring method comprises the following steps: referring to fig. 5, when a first vehicle encounters a red light at a stop line position of an intersection, vehicles at different positions of a road section are drawn, and the vehicle gradually travels to the intersection, a relationship diagram of a distance s between the vehicle and the stop line of the intersection and a time t is drawn, a time Δ t of the vehicle which is continuously motionless at a certain s position is waiting time of the vehicle, a position where the vehicle with zero waiting time is located is a boundary position of the normal queuing area, and the other boundary is the stop line position of the intersection.
The method for acquiring the ultra-long queuing area comprises the following steps: and calculating the fluctuation value of the average driving speed of the pre-selected overlength queuing areas with different lengths in the road section when the vehicle normally runs and the variation value of the average driving speed when the vehicle normally runs and reaches the congestion condition, and selecting the pre-selected overlength queuing area with small average driving speed fluctuation value and large variation value as the overlength queuing area.
Based on floating car data, acquiring average driving speeds of a sampling area I and a sampling area II of a road section L1 (A-B), and when the average driving speed is less than V0And then, the sampling area detects congestion, and the time difference T of the congestion detected by the sampling area I and the congestion detected by the sampling area II is calculated. The time difference T represents the speed of the spread of the congestion.
The accumulation and the passing of the vehicles are a dynamic process, in order to quantify the space-time relevance of the congestion at the intersection, the congestion indexes of the upstream and downstream access channels obtained by calculation and the time difference of the spreading of each congestion are used for representing, and the space-time relevance of the congestion at the intersection is judged by using a fuzzy reasoning method.
| Congestion level of sampling region II | Congestion level of sampling region I | Grade of congestion propagation speed | Degree of crossroad congestion spatiotemporal relevance |
| Severe severity of disease | In general | Height of | Is higher than |
| In general | Severe severity of disease | Is low in | Is low in |
| Severe severity of disease | In general | Is low in | In general |
| In general | Severe severity of disease | Height of | Is higher than |
| Severe severity of disease | Severe severity of disease | Height of | Height of |
| In general | In general | Is low in | Is low in |
| Severe severity of disease | Severe severity of disease | Is low in | In general |
| In general | In general | Height of | Is higher than |
The method comprises the steps of taking intersections and associated road sections with high congestion space-time relevance as congestion grouping units, judging whether congestion space-time relevance exists between different congestion grouping units, and collecting the congestion space-time relevance congestion grouping units to form congestion grouping, wherein the congestion space-time relevance refers to the fact that two congestion grouping units share the same intersection or the road section between the intersections contained by the two congestion grouping units is a space-time associated road section.
Referring to FIG. 2, congestion group 1 is formed by L1 (A-B), L2 (B-C), L7 (A-G), A, B, C, G; l5 (D-E), L6 (E-F), D, E, F formed congestion group 2.
2) And the regulation and control strategy recommendation module is used for providing corresponding regulation and control strategies according to the structural characteristics and traffic flow characteristics of the intersections in the congestion group, wherein the regulation and control strategies comprise an intersection regulation and control sequence, an intersection regulation and control target and intersection regulation and control measures. The intersection regulation and control sequence refers to the sequence of signal regulation and control of the intersection by the signal personnel, the intersection regulation and control target refers to the target to be reached after the signal regulation and control of the intersection by the signal personnel, and the intersection regulation and control measures refer to measures adopted by the signal personnel for realizing the intersection regulation and control target.
2.1) in one embodiment, the regulation and control strategy recommendation module is provided with a corresponding relation between the structural characteristics and traffic flow characteristics of the intersections in the congestion group and the regulation and control strategy. And inputting the current congestion grouping, and providing a corresponding regulation and control strategy by the regulation and control strategy recommendation module according to the corresponding relation.
The signal timing personnel utilize the signal system to control urban road traffic, and correct the traffic rules of the intersection by observing the road congestion condition and analyzing the traffic characteristics of the congested intersection, and meanwhile, generate corresponding manual operation records. And establishing a corresponding relation on the basis of manual operation records.
The corresponding relation between the structural characteristics and traffic flow characteristics of the intersections in the congestion group and the regulation strategy can adopt the following method:
collecting manual operation records, structural characteristics of a road network and traffic flow characteristics, wherein the collected manual operation records comprise operators, operation time, operation intersections, operation types, corresponding modification values and the like; the structural characteristics of the road network comprise the geographic position of the intersection, the connection relation between the intersection and the road section, the service level grade of the intersection and the road section and the like; traffic flow characteristics include average driving speed, congestion index, flow, saturation, flow rate, real-time traffic capacity, and the like.
And (4) preprocessing data, and establishing a regulation and control record sample set. Dividing the signal timing personnel into nn groups of regulation and control records by taking one-time operation of the signal timing personnel as a unit, extracting intersection structural characteristics and traffic flow characteristics corresponding to each group of regulation and control records, and marking intersection regulation and control sequence, regulation and control targets and regulation and control strategies according to the manual operation records corresponding to each group of regulation and control records to form a regulation and control record sample set.
According to the regulation and control record sample set, establishing a corresponding relation between the congestion grouping characteristics and the regulation and control strategy, and adopting the following method:
and storing a complete regulation and control record sample set in the regulation and control strategy recommendation module, calculating the similarity between the currently obtained congestion grouping and the structural characteristics and traffic flow characteristics of the intersections in the regulation and control record sample set, and obtaining the regulation and control strategy corresponding to the regulation and control record with high similarity.
And establishing a corresponding relation model by using a machine learning algorithm, taking the intersection structural characteristics and traffic flow characteristics corresponding to each group of regulation records as input items, taking the intersection regulation and control sequence, regulation and control targets and regulation and control strategies marked by manual operation records as output items, and training by using a regulation and control record sample set to obtain the corresponding relation model on the basis of machine learning algorithm models such as an artificial neural network model, a decision tree model and the like.
The corresponding relation is manually set, and through observation of the control record sample set, when the recorded intersection in the congestion area is adjusted, signal timing personnel generally give priority to adjusting the intersection needing to increase the traffic capacity of an entrance way, so that traffic flow accumulated in the congestion area is evacuated outwards, and the traffic pressure in the congestion area is reduced; and then regulating the intersection needing to reduce traffic pressure output, and reducing traffic pressure transmitted to the congestion area from the outside after evacuating the traffic flowing out of the congestion area so as to prevent continuous congestion. Based on the regular characteristics recorded by manual operation, the method can be represented and learned by fuzzy logic, including fuzzification, fuzzy theory reasoning method and defuzzification. Fuzzification, namely obtaining membership of a fuzzy set from specific input according to a membership function; a fuzzy theory reasoning method, which obtains a fuzzy conclusion from the membership degree of a fuzzy rule and an input to a relevant fuzzy set; defuzzification is carried out, and the fuzzy conclusion is converted into specific and accurate output. The corresponding relation between the congestion grouping characteristics and the regulation strategy can be summarized and obtained.
2.2) in one embodiment, the regulation and control strategy recommendation module comprises an intersection regulation and control sequence recommendation unit, an intersection regulation and control target recommendation unit and an intersection regulation and control measure recommendation unit, and provides an intersection regulation and control sequence, an intersection regulation and control target and an intersection regulation and control measure recommendation respectively according to the structural characteristics and traffic flow characteristics of intersections in congestion groups obtained currently.
A1) In one embodiment, the intersection regulation and control sequence recommendation unit is used for performing priority classification on each intersection in the congestion group according to the structural characteristics and traffic flow characteristics of each intersection in the congestion group, extracting the intersection with the highest priority level as a key intersection, and searching upstream and downstream intersections of a space-time related road section where the key intersection is located to obtain the intersection regulation and control sequence. Methods that can be employed for prioritization: and quantifying the topological complexity of the intersection and the traffic congestion degree of the intersection, and combining to obtain the priority, wherein the combining means comprises but is not limited to addition, subtraction, multiplication, division and power. The topological complexity includes, but is not limited to, the number of connected spatiotemporal links to the intersection within the congestion group, the distance to the critical intersection.
For example: the number of the space-time associated road sections connected with the intersection is used for representing the topological complexity of the intersection, the weighted sum value after the topological complexity and the congestion degree are subjected to standardization processing represents a priority value, and the priority level is represented according to the priority value. Standardization x*=(x-min)/(max-min)，x*Min is the minimum parameter value and max is the maximum parameter value.
Referring to fig. 2, L1 (a-B), L2 (B-C), and L7 (a-G) form a congestion group 1, the group includes 4 intersections, each intersection A, B, C, G, the congestion degrees correspond to 3, 4, 3, and 2, the numbers of connected spatio-temporal associated links are 2, 1, and 1, the max of the congestion degree is 8, and the min is 0, the max of the topology complexity is 4, and the min is 1, after the normalization processing, the priority value = the normalized value of the topology complexity + the normalized value of the congestion degree, and the priority values rank the highest and the lowest, so as to obtain the priority ranking of the 4 intersections: B. a, C, G are provided.
| Crossing | Complexity of topology | Normalized value of topology complexity | Degree of congestion | Normalized value of congestion degree | Priority value |
| A | 2 | 0.33 | 3 | 0.6 | 0.93 |
| B | 2 | 0.33 | 4 | 0.8 | 1.13 |
| C | 1 | 0 | 3 | 0.6 | 0.6 |
| G | 1 | 0 | 2 | 0.4 | 0.4 |
The crossing regulation and control sequence can adopt the following method: the intersection with the highest priority level is extracted as a key intersection, the downstream intersection of the space-time related road section where the key intersection is located is searched, the downstream intersection which is connected with the key intersection through 1 space-time related road section is the 1-level downstream intersection, the downstream intersection which is connected with the key intersection through m space-time related road sections is the m-level downstream intersection, the intersection level is selected from low to high, and the downstream intersection at the same level is selected from high to low according to the intersection congestion degree; searching an upstream intersection of a space-time related road section where the key intersection is located, wherein the upstream intersection is connected with the key intersection through 1 space-time related road section and is a-1-level upstream intersection, the upstream intersection is connected with the key intersection through k space-time related road sections and is a-k-level upstream intersection, the level of the intersection is selected from high to low, and the upstream intersection at the same level is selected from high to low according to the congestion degree of the intersection. If the downstream crossing of the time-space related road section of the key crossing B is C, the upstream crossing of the time-space related road section of the key crossing B is A, the downstream crossing of the time-space related road section of the key crossing B is G, and the crossing regulation and control sequence is as follows: B. c, A, G are provided.
A2) In one embodiment, the intersection regulation and control order recommendation unit performs priority classification on each intersection in the congestion group according to the structural characteristics and traffic flow characteristics of each intersection in the congestion group, extracts the intersection with the highest priority level as a key intersection, sorts the intersections according to the priority levels, sorts the intersections with the same priority levels according to the congestion degrees of the intersections, and obtains the intersection regulation and control order. Such as: the priority levels of the intersection A, B, C, G are 2, 1, 3 and 4 respectively, and then the intersection regulation and control sequence is B, A, C, G.
And the intersection regulation and control target recommendation unit takes the regulation and control target of the key intersection as a general target and decomposes the regulation and control target into the regulation and control targets of all intersections in the congestion group according to the traffic flow direction relation and the traffic flow characteristics of the intersections and the key intersections, wherein the key intersections are the intersections with the highest priority level. The control targets of the key intersection are as follows: the traffic outflow from the key intersection to the downstream intersection of the space-time related road section is increased, and the traffic inflow from the upstream intersection of the space-time related road section to the key intersection is reduced.
B1) In one embodiment, the regulatory objective is an increase or decrease in traffic flow from the intersection to the downstream intersection. The signal timing personnel can select proper regulation measures under the guidance of the regulation target. Referring to fig. 2, a downstream intersection of the time-space related section of the key intersection B is C, an upstream intersection of the time-space related section is a, and in order to increase the capacity of the key intersection B to evacuate the traffic flow, the regulation and control target of the intersection B is as follows: increasing traffic outflow in the B-C direction; regulation and control target of intersection C: increasing traffic outflow from the intersection C and the adjacent intersection C; regulating and controlling target of intersection A: and reducing the traffic outflow from the intersection A to the intersection B, namely reducing the traffic inflow from the intersection A to the intersection B.
B2) In one embodiment, the regulatory objective is an increase or decrease in traffic flow at the intersection to a downstream intersection of the spatiotemporal correlated road segments, and an increase or decrease in traffic flow over a specific time.
According to the traffic flow characteristics of the key intersection, calculating the traffic flow output Q of the key intersection to the downstream intersection of the space-time related road section in the specified time wt by taking the goal that the current congestion degree of the key intersection reaches the specified congestion degree within the specified time wtoutAnd the traffic inflow Q from the upstream crossing to the key crossing of the space-time related road section needs to be reducedinAnd decomposing the congestion information into the regulation and control targets of all the intersections in the congestion group according to the proportion, wherein the proportion can be converted according to the congestion degree of the road sections and the intersections, so that the congestion degree of the road sections and the intersections is balanced.
And the intersection regulation and control measure recommendation unit provides corresponding regulation and control measures according to the structural characteristics and traffic flow characteristics of the intersection.
C1) In one embodiment, the regulatory measures include, but are not limited to, one or a combination of the following: modifying the split ratio of the phases in the original signal timing scheme, modifying the signal control period of the intersection, modifying the phase difference between the intersection and the intersection, turning on or off the temporary phase, and turning on or off the signal coordination control scheme. Referring to fig. 2, the control objective of the key intersection B: increasing traffic outflow in the direction of B-C. Referring to fig. 3, the regulation and control measures of the key intersection B can adopt the modified phase split ratio in the original signal timing scheme, and can increase traffic outflow from the B-C direction by increasing the split ratio of the phase 1 and the phase 4.
The intersection signal timing scheme specifies the release sequence and the release time of different lanes, and is generally composed of a plurality of phases, each phase including the traffic direction controlled by the phase and the set release time. When signal timing personnel regulate and control on site, the signal timing scheme of the intersection can only be regulated. The operation records of signal timing personnel are counted, and the regulation and control measures adopted by the signal timing personnel are ordered from high to low according to the occurrence times, and the sequence is as follows: modifying the split ratio of the phases in the original signal timing scheme, modifying the signal control period of the intersection, modifying the phase difference between the intersection and the intersection, turning on or off the temporary phase, and turning on or off the signal coordination control scheme.
The green signal ratio, the period and the phase difference are adjusted by adjusting variables in the existing regulation and control rule, the regulation and control amplitude is small, the influence on the road junction traffic is small, and the response speed is slow after the regulation and control rule is implemented; the adjustment of the temporary phase and the coordination scheme belongs to the change of the crossing traffic rule, the adjustment and control amplitude is large, the influence on the crossing traffic is large, and the response speed is high after the adjustment and control are implemented.
The implementation conditions of the regulation and control measures can be set by integrating the regulation and control objects, the regulation and control environment and the regulation and control effect of different regulation and control measures. For example, the implementation condition for modifying the phase green ratio may be: the control object is a split parameter of the intersection phase; the regulation and control environment is that the congestion degree of a key intersection does not exceed the maximum congestion upper limit value, and the maximum congestion upper limit value means that the traffic capacity of the current intersection reaches the maximum traffic capacity, and the traffic capacity of the intersection is difficult to improve through the regulation and control of the green-to-traffic ratio; the regulation and control effect is that the traffic volume of the vehicle at the intersection is improved by between Qs and Qb, and Qs and Qb are obtained by calculation according to the current traffic capacity and the maximum traffic capacity of the intersection.
The temporary phase refers to a phase which is not available in the original signal timing scheme and is added for reaching the intersection regulation and control target in a short time. If the original signal timing scheme at the intersection in the east-west straight direction does not have a green light for independent east-west straight movement, but a green light for left turning and straight movement is shared, an independent straight movement green light phase position can be temporarily increased so as to increase the traffic capacity in the east-west straight movement direction.
The signal coordination control scheme refers to that a plurality of intersections are regarded as a whole, and a signal timing scheme combination which is mutually associated with the intersections is established, so that the coordination optimization of the whole signal timing is realized. The coordination scheme aims at obtaining the maximum benefits of the overall traffic operation of the intersection, such as the minimum vehicle delay and parking times, the minimum oil consumption, the maximum traffic flow and the like. The signal timing scheme combination parameters comprise period duration, green signal ratio, phase difference and the like. The phase difference is a time difference between a start point or an end point of a red light or a green light at each intersection and a start point or an end point of a red light or a green light at a certain intersection. The signal coordination control scheme may adopt the existing regional signal coordination control technology, and may also adopt the following method:
the intersection in the congestion group is taken as a whole, the minimization of the total delay time of vehicles at the intersection is taken as a target, the upstream intersection of the key intersection, the key intersection and the downstream intersection of the key intersection in the congestion group are taken as a coordination path of signal phases, and the maximum period time length T of the key intersection is setmaxMinimum period duration TminIncreasing the amplitude Delta T of the period duration, setting a plurality of green ratio schemes S with the initial period duration Tc, setting a phase difference threshold Delta X with the initial green ratio scheme Scmax、△XminThe phase difference increase amplitude δ is set.
The method comprises the steps of obtaining the current average driving speed of each road section in a congestion group, calculating an initial phase difference delta x between intersections, taking an initial period time Tc, an initial split green ratio scheme Sc and the initial phase difference delta x as an initial signal coordination control scheme, simulating at least one signal period execution of all intersections according to a traffic flow theory, and obtaining an initial vehicle total delay time.
And adjusting the period duration Tc by increasing the amplitude Delta T according to the period duration, selecting one green ratio scheme from a plurality of green ratio schemes S, adjusting the phase difference Delta x by increasing the amplitude Delta from the phase difference to obtain a plurality of signal coordination control schemes, and selecting the scheme with the minimum total delay time of the vehicle as the optimal signal coordination control scheme.
C2) In one embodiment, the regulatory measures include, but are not limited to, one or a combination of the following: modifying the split green ratio of the phase in the original timing scheme, modifying the signal control period of the intersection, modifying the phase difference between the intersection and the intersection, opening or closing the temporary phase, and opening or closing the coordination scheme, as well as specific regulation parameters and regulation quantity. Such as: when the regulation and control target of the intersection is definite and the traffic flow passing through the intersection is Q within the designated time wt, the existing signal timing technology, such as a Webster timing method, an ARRB method, an HCM method and the like, can be adopted to obtain specific regulation and control parameters and regulation and control data.
3) The congestion group regulation and control emergency degree identification module is used for acquiring a plurality of congestion groups in the road monitoring area, and identifying the regulation and control emergency degree of each congestion group in the current road monitoring area by utilizing the established congestion group regulation and control emergency degree calculation model according to the structural characteristics and traffic flow characteristics of the congestion groups.
The congestion grouping regulation urgency reflects the severity of the influence of the congestion grouping on the traffic of the road monitoring area. The congestion grouping regulation and control urgency degree calculation model can adopt the following method:
in one embodiment, congestion group characteristics are extracted and mapped with the congestion group regulation urgency, and the congestion group characteristics include, but are not limited to, one or a combination of the following: the number of intersections in the congestion group, the number of road sections in the congestion group, the congestion degree of key intersections in the congestion group, the sum of the congestion degrees of all the road openings in the congestion group and the sum of the service level grades of all the road sections in the congestion group.
If the number of the road junctions in the congestion grouping is taken as the congestion grouping characteristic, the regulation and control urgency degree of the congestion grouping is divided into four grades: very serious, severe, generally severe, reminders. The method is used for reminding when the number of the intersections in the congestion group is 2-3, is generally serious when the number of the intersections in the congestion group is 4-5, is serious when the number of the intersections in the congestion group is 6-7, and is very serious when the number of the intersections in the congestion group is more than 8.
In one embodiment, based on historical congestion clustering data, congestion clustering features are extracted as model input, congestion clustering regulation emergency degree is manually marked as model output, and a congestion clustering regulation emergency degree calculation model is established by utilizing a machine learning algorithm such as a support vector machine model, a decision tree model and the like.
In one embodiment, an operation flow of an urban road regional congestion control policy recommendation system is as follows: the system collects road network traffic flow characteristics in real time, displays congestion groups in real time, adjusts and controls the emergency degree to be in a very serious display red color, and prompts an intersection adjusting and controlling sequence, an intersection adjusting and controlling target and an intersection adjusting and controlling strategy of the congestion groups by clicking the red congestion groups by signal timing personnel.
A method for recommending a regulation and control strategy for urban road regional congestion comprises the following steps.
1. Identifying a congestion group, namely defining a sampling area I at an inlet of an upstream road section and defining a sampling area II at an outlet of a downstream road section; acquiring traffic flow characteristics of a sampling area I and the sampling area II, and calculating a time difference T when the traffic flow characteristics of the sampling area I and the sampling area II reach a congestion condition; when the traffic flow characteristics of the sampling area I and the sampling area II and the time difference T meet the congestion grouping condition, the road section is used as a space-time associated road section, and the space-time associated road section and the intersections at the two ends of the space-time associated road section are used as congestion grouping units to obtain the congestion grouping units; judging whether congestion space-time association exists between different congestion group units, and collecting the congestion group units related to congestion space-time to form congestion group units, wherein the congestion space-time association means that two congestion group units share the same intersection or a road section between intersections contained in the two congestion group units is a space-time association road section.
2. And identifying an intersection regulation and control sequence, carrying out priority division on each intersection in the congestion group according to the topology complexity and the intersection traffic congestion degree of each intersection in the congestion group, extracting the intersection with the highest priority level as a key intersection, and searching upstream and downstream intersections of a space-time related road section where the key intersection is located to obtain the intersection regulation and control sequence.
The number of space-time associated road sections connected with the intersection is used for representing the topological complexity of the intersection, the weighted sum value after the topological complexity and the congestion degree are standardized is used for representing the priority value, and the priority level is represented according to the priority value, wherein the standardization process comprises the following steps: x is the number of*=(x-min)/(max-min)，x*Min is the minimum parameter value and max is the maximum parameter value.
3. And identifying intersection regulation targets, namely decomposing the regulation targets of all intersections in the congestion group into the regulation targets of all intersections in the congestion group by taking the total target of increasing the traffic outflow of the key intersections to the downstream intersections of the space-time associated road sections and reducing the traffic inflow of the upstream intersections of the space-time associated road sections to the key intersections as the total target according to the traffic flow direction relation and the traffic flow characteristics of all intersections and key intersections in the congestion group.
4. Recommending an intersection regulation and control strategy, and providing corresponding regulation and control measures according to the structural characteristics and traffic flow characteristics of the intersection, wherein the regulation and control measures comprise one or a combination of the following measures: modifying the split green ratio of the phase in the original timing scheme, modifying the signal control period of the intersection, modifying the phase difference between the intersection and the intersection, opening or closing the temporary phase, and opening or closing the coordination scheme, as well as specific regulation parameters and regulation quantity.
Claims (9)
1. A system for recommending urban road regional congestion control strategies is characterized by comprising the following steps:
the traffic jam group identification module is used for identifying the space-time relevance between intersections and intersections according to the structural characteristics and traffic flow characteristics of a road network, when the condition of the traffic jam group is met, the intersections and the road sections between the intersections are space-time relevance road sections, the space-time relevance road sections and the intersections at two ends are gathered to form the traffic jam group, and the space-time relevance refers to the mutual influence relation of the traffic flow characteristics on time and space, wherein the quantification method of the space-time relevance comprises the following steps:
a sampling area I is defined at an inlet of an upstream road section, and a sampling area II is defined at an outlet of a downstream road section; acquiring traffic flow characteristics of the sampling area I and the sampling area II, and calculating a time difference T when the traffic flow characteristics of the sampling area I and the sampling area II reach a congestion condition; quantizing the time-space relevance by adopting a fuzzy reasoning method;
the sampling area II is an ultra-long queuing area, the ultra-long queuing area is an area adjacent to a normal queuing area Lx, and the normal queuing area Lx acquiring method comprises the following steps: drawing vehicles at different positions of a road section from the first vehicle encountering a red light at the position of a stop line at an intersection, gradually driving to the intersection, wherein the distance s between the vehicle and the stop line at the intersection and the time t are in a relational graph, the time delta t of the vehicle which is continuously motionless at a certain s position is the waiting time of the vehicle, the position of the vehicle with the zero waiting time is the boundary position of the normal queuing area, and the other boundary is the position of the stop line at the intersection; the method for acquiring the ultra-long queuing area comprises the following steps: calculating the fluctuation value of the average driving speed of the pre-selected overlength queuing areas with different lengths in the road section when the vehicle normally runs and the variation value of the average driving speed when the vehicle normally runs and reaches the congestion condition, and selecting the pre-selected overlength queuing area with small average driving speed fluctuation value and large variation value as the overlength queuing area;
and the regulation and control strategy recommendation module is used for providing corresponding regulation and control strategies according to the structural characteristics and traffic flow characteristics of the intersections in the congestion group, wherein the regulation and control strategies comprise an intersection regulation and control sequence, an intersection regulation and control target and intersection regulation and control measures.
2. The system as claimed in claim 1, wherein the regulation strategy recommendation module comprises:
the intersection regulation and control sequence recommendation unit is used for carrying out priority division on each intersection in the congestion group according to the structural characteristics and traffic flow characteristics of each intersection in the congestion group, extracting the intersection with the highest priority level as a key intersection, searching upstream and downstream intersections of a space-time related road section where the key intersection is located, and obtaining an intersection regulation and control sequence;
the intersection regulation and control target recommendation unit is used for decomposing the regulation and control target of each intersection in the congestion group by taking the regulation and control target of the key intersection as a general target according to the traffic flow direction relation and the traffic flow characteristics of the intersections and the key intersections, wherein the key intersection is the intersection with the highest priority level in the congestion group;
and the intersection regulation and control measure recommendation unit is used for providing corresponding regulation and control measures according to the structural characteristics, traffic flow characteristics, an intersection regulation and control sequence and an intersection regulation and control target of the intersection.
3. The system for recommending an urban road regional congestion control strategy according to claim 2, wherein the priority is obtained by calculating according to topology complexity and congestion degree of an intersection:
and expressing the topology complexity by using the number of space-time associated road sections connected with the intersection, expressing the priority value by using the weighted sum value after the topology complexity and the congestion degree are subjected to standardization processing, and expressing the priority level according to the priority value.
4. The system for recommending an urban road regional congestion control strategy according to claim 2, wherein the method for acquiring the intersection control sequence comprises:
taking the intersection with the highest priority level as a key intersection, searching a downstream intersection of a space-time related road section where the key intersection is located, wherein the downstream intersection is connected with the key intersection through 1 space-time related road section and is a level 1 downstream intersection, the downstream intersection is connected with the key intersection through m space-time related road sections and is a level m downstream intersection, the level of the intersection is selected from low to high, and the downstream intersection at the same level is selected from high to low according to the congestion degree of the intersection; searching an upstream crossing of a space-time related road section where the key crossing is located, wherein the upstream crossing is connected with the key crossing through 1 space-time related road section and is a-1-level upstream crossing, the upstream crossing is connected with the key crossing through k space-time related road sections and is a-k-level upstream crossing, the grade of the crossing is selected from high to low, and the upstream crossing at the same level is selected from high to low according to the congestion degree of the crossing.
5. The system according to claim 2, wherein the control of the critical intersection aims to increase the traffic outflow from the critical intersection to the downstream intersection of the space-time related section and decrease the traffic inflow from the upstream intersection of the space-time related section to the critical intersection; the intersection regulation and control target is to increase or decrease traffic flow of the intersection to the downstream intersection.
6. The system as claimed in claim 2, wherein the intersection regulation measure includes but is not limited to one or a combination of the following: modifying the split ratio of the phases in the original signal timing scheme, modifying the signal control period of the intersection, modifying the phase difference between the intersection and the intersection, turning on or off the temporary phase, and turning on or off the signal coordination control scheme.
7. The system for recommending an urban road regional congestion control strategy according to claim 1, further comprising:
and the congestion group regulation and control emergency degree identification module is used for acquiring a plurality of congestion groups in a road monitoring area, and identifying the regulation and control emergency degree of each congestion group in the current road monitoring area by utilizing the established congestion group regulation and control emergency degree calculation model according to the structural characteristics and traffic flow characteristics of the congestion groups.
8. A method for recommending a regulation and control strategy for urban road regional congestion is characterized by comprising the following steps:
1) identifying a congestion group, namely defining a sampling area I at an inlet of an upstream road section and defining a sampling area II at an outlet of a downstream road section; acquiring traffic flow characteristics of the sampling area I and the sampling area II, and calculating a time difference T when the traffic flow characteristics of the sampling area I and the sampling area II reach a congestion condition; when the traffic flow characteristics of the sampling area I and the sampling area II and the time difference T meet the congestion grouping condition, the road section is used as a space-time associated road section, and the space-time associated road section and the intersections at the two ends of the space-time associated road section are used as congestion grouping units to obtain congestion grouping units; judging whether congestion space-time association exists between different congestion group units, and collecting the congestion group units related to congestion space-time association to form congestion group units, wherein the congestion space-time association means that two congestion group units share the same intersection or a road section between intersections contained by the two congestion group units is a space-time association road section; quantizing the time-space relevance by adopting a fuzzy reasoning method;
the sampling area II is an ultra-long queuing area, the ultra-long queuing area is an area adjacent to a normal queuing area Lx, and the normal queuing area Lx acquiring method comprises the following steps: drawing vehicles at different positions of a road section from the first vehicle encountering a red light at the position of a stop line at an intersection, gradually driving to the intersection, wherein the distance s between the vehicle and the stop line at the intersection and the time t are in a relational graph, the time delta t of the vehicle which is continuously motionless at a certain s position is the waiting time of the vehicle, the position of the vehicle with the zero waiting time is the boundary position of the normal queuing area, and the other boundary is the position of the stop line at the intersection; the method for acquiring the ultra-long queuing area comprises the following steps: calculating the fluctuation value of the average driving speed of the pre-selected overlength queuing areas with different lengths in the road section when the vehicle normally runs and the variation value of the average driving speed when the vehicle normally runs and reaches the congestion condition, and selecting the pre-selected overlength queuing area with small average driving speed fluctuation value and large variation value as the overlength queuing area;
2) identifying an intersection regulation and control sequence, carrying out priority division on each intersection in the congestion group according to the topology complexity and the intersection traffic congestion degree of each intersection in the congestion group, extracting the intersection with the highest priority level as a key intersection, searching upstream and downstream intersections of a space-time associated road section where the key intersection is located, and obtaining the intersection regulation and control sequence;
3) identifying intersection regulation targets, namely decomposing the regulation targets of all intersections in the congestion group into the regulation targets of all intersections in the congestion group by taking the total target of increasing the traffic outflow of the key intersections to the downstream intersections of the time-space associated road sections and reducing the traffic inflow of the upstream intersections of the time-space associated road sections to the key intersections as the total target according to the traffic flow direction relation and the traffic flow characteristics of all intersections and key intersections in the congestion group;
4) recommending an intersection regulation and control strategy, and providing corresponding regulation and control measures according to the structural characteristics and traffic flow characteristics of the intersection, wherein the regulation and control measures comprise one or a combination of the following measures: modifying the split of the phases in the original timing scheme, modifying the signal control period of the intersection, modifying the phase difference between the intersection and the intersection, turning on or off the temporary phase, and turning on or off the coordination scheme.
9. The method for recommending an urban road regional congestion control strategy according to claim 8, wherein the priority of step 2) is specifically calculated as follows:
the topological complexity of the intersection is represented by the number of space-time associated road sections connected with the intersection, the topological complexity and the weighted sum value after the congestion degree is subjected to standardization processing represent priority values, and the priority level is represented according to the priority value, wherein the standardization processing comprises the following steps: x = (x-min)/(max-min), x = normalized value, min parameter minimum, max parameter maximum.
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Application publication date: 20190514 Assignee: ZHEJIANG YINJIANG TRAFFIC TECHNOLOGY Co.,Ltd. Assignor: Yinjiang Technology Co.,Ltd. Contract record no.: X2023980042517 Denomination of invention: A recommendation system and method for congestion control strategies in urban road areas Granted publication date: 20211008 License type: Common License Record date: 20230925 |