CN114639254A - Urban multi-lane roundabout traffic control method and system - Google Patents

Abstract

The invention provides a traffic control method and a traffic control system for an urban multi-lane roundabout, which belong to the technical field of urban traffic operation management, and are used for analyzing and obtaining the traffic demand and the time-space distribution characteristics of each direction of each inlet channel of the roundabout based on the traffic data of the roundabout; analyzing the spatial distribution characteristics of the flow demand of each inlet channel of the roundabout in each direction based on the flow demand of each inlet channel of the roundabout in each direction and the spatial and temporal distribution characteristics of the flow demand; and (4) combining the equal queuing length principle, performing lane function division on the entrance of the roundabout, and obtaining a passing scheme according to the function division result. The method is based on the equal queuing length principle, and is used for carrying out lane function division on the roundabout entrance lane; the roundabout left turn and the straight-going vehicles can enter the roundabout in order, conflicts caused by interweaving are reduced, vehicle delay in the roundabout is reduced, passing efficiency is improved, potential safety hazards are reduced, and meanwhile construction funds and operation and maintenance costs are saved.

Description

Urban multi-lane roundabout traffic control method and system

technical field

The invention relates to the technical field of urban traffic operation management, in particular to a traffic control method and system at an urban multi-lane roundabout.

Background technique

A roundabout is a common form of road level intersection. Vehicles follow the driving rule of "enter the ring and give way", enter the intersection in a continuous and orderly manner, and travel around the island counterclockwise. Traditional roundabouts are not controlled by signals. In the case of low traffic demand, roundabouts have the advantages of less delay and high traffic efficiency, but with the increase of urban road traffic demand, many roundabouts reach Saturated, or even supersaturated, self-organized roundabouts are difficult to carry a large traffic load.

The current methods for improving the traffic efficiency of urban roundabouts mainly include increasing the number of roundabout loops and entrance lanes and adding traffic signal control facilities.

For conventional intersections, the easiest and most intuitive way to improve the traffic efficiency is to increase the size of the intersection (increase the number of lanes), but this method has a general effect on improving the traffic efficiency of roundabout intersections. After the traffic flow of the roundabout is saturated, the operation of the roundabout may become worse, and the reconstruction cost is relatively large and the cost performance is low. Increasing the number of roundabouts and entrance lanes requires a larger space at the intersection to accommodate more lanes, which is almost impossible to achieve in big cities with very tight road resources, which undoubtedly requires the roundabout to be carried out. Larger retrofits cost relatively high, and for unsignaled roundabouts, more loops or entrances mean more complex interleaving, which may not be able to effectively improve the traffic efficiency of unsignaled roundabouts .

For the addition of traffic signal control facilities, the existing signal control technologies at the roundabout mainly include: 1) One-time left-turn parking method: generally, each entrance is released in turn or coordinated by each entrance. All vehicles entering the roundabout will only stop once at the roundabout entrance and may pass when the light is green. This method is widely applicable, but the cycle is generally longer. Its phase control scheme is shown in Figure 1 (single-port rotation) and Figure 2 (coordinated control of each inlet). 2) Left-turn secondary parking method: For left-turn vehicles, secondary parking is required. Vehicles turning left and going straight enter the ring road at the same time. Vehicles going straight can pass the intersection directly, but left-turn traffic needs to stop in the ring road for a second time and wait for the signal light. This method reduces the conflict of traffic flows in different directions, greatly improves the traffic efficiency and traffic capacity of the roundabout, and is suitable for the roundabout with small left-turn flow and large radius of central island. Its phase control scheme is shown in Figure 3. 3) Left-turn clockwise detour method: The control method is similar to that of a plane cross. The left-turn vehicle does not go around the roundabout counterclockwise, but directly turns left along the curb of the central island, so this method is only suitable for left-turn traffic with relatively low traffic volume. Large four-way roundabout, and the radius of the central island cannot be too large. Its phase control scheme is shown in Figure 4.

Although the means of adding signal control is very effective in improving traffic efficiency and capacity, the addition of signal control is also cost-intensive. In addition, for roundabouts where traffic demand is not so large, adding signal control facilities will lead to vehicle parking delays. Increase, the original unique advantages of non-signaled control roundabouts cannot be reflected.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a kind of city that does not need to add traffic signal control, effectively alleviates the problems of small traffic capacity and large potential safety hazards of non-signal control roundabouts, and saves construction funds and the cost and workload of subsequent operation management and maintenance. A traffic control method and system for a lane roundabout are provided to solve at least one technical problem existing in the above-mentioned background art.

In order to achieve the above object, the present invention has adopted the following technical solutions:

In one aspect, the present invention provides a traffic control method for an urban multi-lane roundabout, comprising:

Based on the flow data of the roundabout, analyze and obtain the flow demand in each direction of each entrance of the roundabout and its temporal and spatial distribution characteristics;

Based on the flow demand in all directions of the roundabout's inlets and its temporal and spatial distribution characteristics, the spatial distribution characteristics of the flow demand in each direction of the roundabout's inlets are analyzed;

Combined with the principle of equal queuing length, the lane function is divided at the entrance of the roundabout, and the traffic plan is obtained according to the function division result.

Optionally, analyze the spatial distribution characteristics of the flow demand in each direction of each inlet of the roundabout, and obtain the ratio of the left-turn, straight-forward, and right-turn flow to the total flow of the inlet in each inlet of the roundabout; The ratio of the left turn, straight and right turn flow at the entrance to the total flow of the entrance, combined with the principle of equal queue length, divides the lane functions at the entrance of the roundabout.

Optionally, dividing the lane functions includes: determining the number of lane groups of each entry road based on the geometric layout of the roundabout; calculating the queuing length flow of lane groups with more than one lane number; determining the lane functions in order from left to right. .

Optionally, calculating the queuing length traffic of lane groups with more than one lane number includes:

是车道组LG的等排队长度流量；V_i ^d是调查得到的d进口道i流向的高峰小时流量；N_LG为车道组LG包含的车道数。In the formula,

is the equal-queue-length flow of the lane group LG; V _i ^d is the peak hour flow of the flow direction of the d entrance i obtained from the investigation; N _LG is the number of lanes included in the lane group LG.

Optionally, according to the constraint of the equal queue length flow Va, the steering flow is sequentially allocated to the lane, and the lane function is determined according to the flow steering.

Optionally, according to the lane functions of each entrance road of the roundabout, design signs indicating the lane functions of the entrance road dedicated to the roundabout.

In a second aspect, the present invention provides an urban multi-lane roundabout traffic control system, comprising:

The acquisition module is used to analyze and obtain the flow demand in each direction of each entrance of the roundabout and its spatiotemporal distribution characteristics based on the flow data of the roundabout;

The analysis module is used to analyze the spatial distribution characteristics of the flow demand in each direction of each inlet of the roundabout based on the flow demand in each direction of each inlet of the roundabout and its temporal and spatial distribution characteristics;

The determination module is used to divide the lane function at the entrance of the roundabout in combination with the principle of equal queue length, and obtain the traffic plan according to the function division result.

In a third aspect, the present invention provides a computer device comprising a memory and a processor, the processor and the memory are in communication with each other, the memory stores program instructions executable by the processor, the processor calls The program instructions execute the above-described urban multi-lane roundabout traffic control method.

In a fourth aspect, the present invention provides an electronic device, comprising a memory and a processor, the processor and the memory communicate with each other, the memory stores program instructions executable by the processor, and the processor calls The program instructions execute the above-described urban multi-lane roundabout traffic control method.

In a fifth aspect, the present invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, implements the above-mentioned method for controlling the passage of an urban multi-lane roundabout.

The invention has the beneficial effects: based on the flow data of the roundabout, the flow demand in each direction of each entrance of the roundabout and its temporal and spatial distribution characteristics are obtained by analysis, and based on the principle of equal queuing length, lane functions are divided for the entrance of the roundabout. Vehicles turning left and going straight at the roundabout can enter the ring road in an orderly manner, reducing conflicts caused by interweaving, reducing vehicle delays in the roundabout, improving traffic efficiency, reducing potential safety hazards, and saving construction funds and operation and maintenance costs.

Additional aspects and advantages of the present invention will be set forth in part in the following description, which will be apparent from the following description, or may be learned by practice of the present invention.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic diagram of a method for controlling a stop signal for one turn left in the prior art (single-port wheel release).

FIG. 2 is a schematic diagram of a method for controlling a stop signal for one turn left once in the prior art (coordinated release of each entrance).

FIG. 3 is a schematic diagram of a control method of a left-turn secondary stop signal in the prior art.

FIG. 4 is a schematic diagram of a control method for a left turn clockwise detour signal in the prior art.

FIG. 5 is a schematic flowchart of lane function division according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of a traffic structure of a roundabout according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of an indication sign board for the lane function of a dedicated entrance road for a roundabout according to an embodiment of the present invention.

FIG. 8 is a schematic diagram of a road network structure of a simulation experiment according to an embodiment of the present invention.

FIG. 9 is a schematic diagram of an optimization result of delay per vehicle under different left turn ratios according to an embodiment of the present invention.

FIG. 10 is a schematic diagram of the results of the average vehicle delay (when the traffic load is large) under different left-turn ratios of the simulation experiment according to the embodiment of the present invention.

FIG. 11 is a schematic diagram of the results of the increase in delay per vehicle (when the traffic load is large) under different left-turn ratios according to the embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below through the accompanying drawings are exemplary and are only used to explain the present invention, but not to be construed as a limitation of the present invention.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as herein, are not to be taken in an idealized or overly formal sense. explain.

It will be understood by those skilled in the art that the singular forms "a", "an", "the" and "the" as used herein can include the plural forms as well, unless expressly stated otherwise. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of stated features, integers, steps, operations, elements and/or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements and/or groups thereof.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

In order to facilitate the understanding of the present invention, the present invention will be further explained and described below with reference to the accompanying drawings with specific embodiments, and the specific embodiments do not constitute limitations to the embodiments of the present invention.

Those skilled in the art should understand that the accompanying drawings are only schematic diagrams of the embodiments, and the components in the accompanying drawings are not necessarily necessary to implement the present invention.

Example 1

Embodiment 1 provides an urban multi-lane roundabout traffic control system, including:

The acquisition module is used to analyze and obtain the flow demand in each direction of each entrance of the roundabout and its spatiotemporal distribution characteristics based on the flow data of the roundabout;

The analysis module is used to analyze the spatial distribution characteristics of the flow demand in each direction of each inlet of the roundabout based on the flow demand in each direction of each inlet of the roundabout and its temporal and spatial distribution characteristics;

The determination module is used to divide the lane function at the entrance of the roundabout in combination with the principle of equal queue length, and obtain the traffic plan according to the function division result.

In this embodiment 1, a method for controlling the passage of an urban multi-lane roundabout is realized by using the above system, including:

Based on the flow data of the roundabout, analyze and obtain the flow demand in each direction of each entrance of the roundabout and its temporal and spatial distribution characteristics;

Based on the flow demand in all directions of the roundabout's inlets and its temporal and spatial distribution characteristics, the spatial distribution characteristics of the flow demand in each direction of the roundabout's inlets are analyzed;

Combined with the principle of equal queuing length, the lane function is divided at the entrance of the roundabout, and the traffic plan is obtained according to the function division result.

Among them, the spatial distribution characteristics of the flow demand in each direction of each inlet of the roundabout are analyzed, and the proportion of the left turn, straight and right turn flow in each inlet of the roundabout to the total flow of the inlet is obtained; The proportion of the flow of left turn, straight and right turn to the total flow of the entrance, combined with the principle of equal queue length, divides the lane functions at the entrance of the roundabout.

The division of lane functions includes: determining the number of lane groups of each entrance based on the geometric layout of the roundabout; calculating the queue length flow of lane groups with more than one lane; determining the lane functions in order from left to right.

Calculating the queuing length traffic of lane groups with more than one lane includes:

是车道组LG的等排队长度流量；V_i ^d是调查得到的d进口道i流向的高峰小时流量；N_LG为车道组LG包含的车道数。In the formula,

is the equal-queue-length flow of the lane group LG; V _i ^d is the peak hour flow of the flow direction of the d entrance i obtained from the investigation; N _LG is the number of lanes included in the lane group LG.

According to the constraint of the equal queue length flow Va, the steering flow is allocated to the lane in turn, and the lane function is determined according to the flow steering.

Finally, according to the lane function of each entrance road of the roundabout, design the lane function indication signs of the entrance road dedicated to the roundabout.

Example 2

The second embodiment provides a method for improving the traffic efficiency of a roundabout, so as to solve the technical problem of relatively high construction cost and operation and maintenance cost in the prior art. The method technical scheme described in this embodiment 2 is as follows:

Based on the flow data of the roundabout, the flow demand in each direction of each entrance of the roundabout and its temporal and spatial distribution characteristics are obtained by analysis. Collect the flow data of a typical working day at the roundabout, obtain the peak hourly flow of each inlet and flow direction of the roundabout, and convert different types of vehicles into standard equivalent cars (PCU).

Based on the peak hourly flow of each inlet of the roundabout in each flow direction, the spatial distribution characteristics of the flow demand in each flow direction of each inlet of the roundabout are analyzed and obtained, and the flow of left, straight and right turns in each inlet of the roundabout is obtained as a percentage of the total import flow.

Based on the principle of equal queue length, the lane functions are divided at the entrance of the roundabout, so that the left-turn and straight vehicles enter the roundabout in an orderly manner, including the following steps:

Take a conventional four-way roundabout as an example, but the present invention is not limited to a conventional four-way roundabout.

S1: Determine the number of lane groups for each entrance based on the geometric layout of the roundabout;

S2: Calculate the queue length flow Va of lane groups with more than one lane number;

是车道组LG的等排队长度流量；V_i ^d是调查得到的d进口道i流向的高峰小时流量；N_LG为车道组LG包含的车道数。In the formula,

is the equal-queue-length flow of the lane group LG; V _i ^d is the peak hour flow of the flow direction of the d entrance i obtained from the investigation; N _LG is the number of lanes included in the lane group LG.

S3: Determine the lane functions in order from left to right: According to the constraint of the equal queue length flow Va, the steering flow is sequentially allocated to the lane, and the lane function is determined according to the flow steering. The specific process is shown in Figure 5. In the figure, Va is the queuing length flow of the lane group; Vi is the peak hour flow of the lane group including the flow direction (numbers 1-3 are based on the flow direction close to the road centerline); N is the number of lanes included in the lane group; Ln is the The nth lane on the side of the road centerline included in the lane group.

S4: According to the lane function of each entrance road of the roundabout, design the lane function indication signs of the entrance road dedicated to the roundabout. In order to make the driver clearly identify the driving flow line in the roundabout, in this embodiment, a lane function indication sign with a roundabout sign and a lane function indication sign capable of indicating the actual flow line of turning left and going straight may be designed. The design of the sign board shall include the functional instructions of all lanes of the entry road, and shall be accompanied by relevant explanatory text to assist the driver in recognizing the sign board information.

In practical applications of the method described in this embodiment, for the optimization of the traffic organization of the non-signal controlled roundabout, the preferred method is generally to add traffic signal control facilities, and also to divide the lane functions at the same time, but few traffic engineers will Improve the efficiency of non-signaled roundabouts by dividing the lane function.

Example 3

This embodiment 3 provides a method for organizing and managing traffic flow at a roundabout, which does not require additional traffic signal control facilities at the roundabout, improves the traffic efficiency of the roundabout, and has low construction and operation and maintenance costs. Traffic organization optimization logic for roundabouts.

In this embodiment 3, based on the flow data of the roundabout, the flow demand in each direction of each entrance of the roundabout and its temporal and spatial distribution characteristics are obtained by analysis, and based on the principle of equal queuing length, the lane function is divided for the entrance of the roundabout. . Vehicles turning left and going straight at the roundabout can enter the ring road in an orderly manner, reducing conflicts caused by interweaving, reducing vehicle delays in the roundabout, improving traffic efficiency, reducing potential safety hazards, and saving construction funds and operation and maintenance costs.

(1) The geometric layout of a roundabout is shown in Figure 6. There are three lanes at the north, south, and west entrances for left-turn and straight vehicles, one lane for right-turn and advance diversion, and three lanes for left-turn at the east entrance. , Go straight, and turn right.

(2) Obtain the peak hourly flow demand of each inlet of the roundabout in each flow direction, as shown in Table 1.

Table 1. Peak hourly flow demand for each inlet channel and each flow direction of the four-way non-signal-controlled roundabout

(3) Determine the lane group according to the geometric layout of the intersection entrance road:

1) The north, south, and west entrances all include a right-turn lane, so the right-turn lane is divided into a separate lane group, which are recorded as: LG _N 1, LG _S 1, LG _W 1, and the other three lanes are divided (Turn left and go straight) are divided into a lane group LG _N 2, LG _S 2, LG _W 2; the three lanes at the east entrance (turn left, go straight and turn right) are divided into a lane group LG _E 1.

2) Based on the queuing principle, calculate the queuing length flow Va of each lane. As shown in table 2.

North import:

South import:

East import:

West imports:

Table 2 Lane group division of four-way non-signal-controlled roundabout and its equal queue length flow

3) Determine the lane functions in turn according to the lane function division method:

北进口最内侧车道N1为直左合用车道；N2、N3为直行专用车道；North import: by

The innermost lane of the north entrance, N1, is a straight-left shared lane; N2 and N3 are dedicated lanes for straight-through;

南进口最内侧车道S1为左转专用车道，由

N2为直左合用车道，N3为直行专用车道；South Imports: By

The innermost lane S1 of the south entrance is a dedicated lane for left turns.

N2 is the straight-left shared lane, and N3 is the straight-only dedicated lane;

西进口最内侧车道W1为左转专用车道，由

N2为直左合用车道，N3为直行专用车道；West imports: by

The innermost lane W1 of the west entrance is a dedicated lane for left turns.

N2 is the straight-left shared lane, and N3 is the straight-only dedicated lane;

E1为左转专用车道，由

E2为直左合用车道，由

E3为直右合用车道。East imports: by

E1 is a dedicated lane for left-turns.

E2 is the straight-left shared lane, which is

E3 is the straight right shared lane.

Table 3 Function division of four-way non-signal-controlled roundabout lanes

Taking the west entrance as an example, its lane function indicator sign is shown in Figure 7.

A simulation experiment is designed, and the present invention is further described by using Vissim simulation, and the experimental design is as follows.

Use Vissim to build a model of a roundabout without signal control (two scenarios with lane division function and no lane division function), as shown in Figure 8.

This test is designed under the condition of equilibrium OD, and does not consider the influence of pedestrians and non-motor vehicles. Since the right-turn vehicle has little influence on the traffic performance, the overall performance of the system is actually mainly determined by the straight-through and left-turn vehicles, so the simulation test is based on the fixed right-turn ratio (25%), changing the left-turn and straight-through Compared with the delay of the function of dividing the lane and the function of not dividing the lane, the random seed is modified to carry out 15 groups of experiments and the average value is obtained to reduce the random effect of the results. Table 4 shows the experimental design conditions for the flow direction ratio.

Table 4 Experimental design of flow direction ratio

experiment result shows:

(1) As shown in Figure 9, when the traffic load level of the roundabout is moderate, the lane division function has a certain optimization effect on the delay of vehicles at the roundabout under different left-turn ratio scenarios. However, due to the Vissim model simulation The influence of randomness and the absolute value of the average vehicle delay are relatively small, and the optimization amplitude fluctuates to a certain extent with the change of the left turn ratio, and the peak value is relatively insignificant.

(2) In the case of high traffic load levels at roundabouts:

1) As shown in Figure 9, with the increase of the ratio of left turns at each entrance of the roundabout, the optimization effect of the lane division function on the average delay of vehicles at the intersection first increases and then decreases, and the optimization effect is about 35% of the left turn ratio. -45% is the most significant, indicating that the management measure of dividing lanes is suitable for traffic scenarios in which the ratio of left-turning at the roundabout entrance is close to that of going straight.

2) As shown in Figure 9, the peak value of the average vehicle delay optimization effect is about 40%-45%, while the non-left-turn straight ratio is closer to 1 in the interval of 30%-35%. The impact of the intersection is greater.

3) As shown in Figure 10, as the ratio of left turns increases, the average vehicle delay at the roundabout gradually increases, and the growth trend of the curve is: when the ratio of left turns is below 30%, the average vehicle delay increases slowly; When the ratio is between 30% and 50%, the average vehicle delay increases rapidly, and when the left turn ratio is above 50%, the average vehicle delay growth gradually slows down.

4) It can be seen from Figure 11 that the curve of the average vehicle delay growth rate with the function of dividing lanes has obvious lag compared with the curve without dividing the function of lanes, indicating that for the delay caused by left-turning vehicles at the roundabout, the measure of dividing the lane function has Significant optimization features.

Example 4

Embodiment 4 of the present invention provides an electronic device, including a memory and a processor, the processor and the memory communicate with each other, the memory stores program instructions that can be executed by the processor, and the processor invokes the The above-mentioned program instruction executes the traffic control method for an urban multi-lane roundabout, and the method includes the following process steps:

Based on the flow data of the roundabout, analyze and obtain the flow demand in each direction of each entrance of the roundabout and its temporal and spatial distribution characteristics;

Based on the flow demand in all directions of the roundabout's inlets and its temporal and spatial distribution characteristics, the spatial distribution characteristics of the flow demand in each direction of the roundabout's inlets are analyzed;

Combined with the principle of equal queuing length, the lane function is divided at the entrance of the roundabout, and the traffic plan is obtained according to the function division result.

Example 5

Embodiment 5 of the present invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, implements a method for controlling the passage of an urban multi-lane roundabout, and the method includes the following process steps:

Based on the flow data of the roundabout, analyze and obtain the flow demand in each direction of each entrance of the roundabout and its temporal and spatial distribution characteristics;

Based on the flow demand in all directions of the roundabout's inlets and its temporal and spatial distribution characteristics, the spatial distribution characteristics of the flow demand in each direction of the roundabout's inlets are analyzed;

Combined with the principle of equal queuing length, the lane function is divided at the entrance of the roundabout, and the traffic plan is obtained according to the function division result.

Example 6

Embodiment 6 of the present invention provides a computer device, including a memory and a processor, the processor and the memory communicate with each other, the memory stores program instructions that can be executed by the processor, and the processor invokes the The above-mentioned program instruction executes the traffic control method for an urban multi-lane roundabout, the method comprising the following steps:

Based on the flow data of the roundabout, analyze and obtain the flow demand in each direction of each entrance of the roundabout and its temporal and spatial distribution characteristics;

Based on the flow demand in all directions of the roundabout's inlets and its temporal and spatial distribution characteristics, the spatial distribution characteristics of the flow demand in each direction of the roundabout's inlets are analyzed;

Combined with the principle of equal queuing length, the lane function is divided at the entrance of the roundabout, and the traffic plan is obtained according to the function division result.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing apparatus, where a series of operational steps are performed on the computer or other programmable apparatus to produce a computer-implemented process, whereby the instructions for execution on the computer or other programmable apparatus Steps are provided for implementing the functions specified in a flow or flows of the flowcharts and/or a block or blocks of the block diagrams.

Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, they do not limit the scope of protection of the present invention. Those skilled in the art should understand that on the basis of the technical solutions disclosed in the present invention, those skilled in the art do not need to pay Various modifications or deformations that can be made by creative work shall be covered within the protection scope of the present invention.

Claims (10)

1. an urban multi-lane roundabout traffic control method, is characterized in that, comprises: Based on the flow data of the roundabout, analyze and obtain the flow demand in each direction of each entrance of the roundabout and its temporal and spatial distribution characteristics; Based on the flow demand in all directions of the roundabout's inlets and its temporal and spatial distribution characteristics, the spatial distribution characteristics of the flow demand in each direction of the roundabout's inlets are analyzed; Combined with the principle of equal queuing length, the lane function is divided at the entrance of the roundabout, and the traffic plan is obtained according to the function division result. 2. The traffic control method for an urban multi-lane roundabout according to claim 1, wherein the spatial distribution characteristics of the flow demand in each direction of each entrance of the roundabout are analyzed, and the left turn in each entrance of the roundabout, The proportion of the flow of going straight and turning right to the total flow of the inlet; based on the proportion of the flow of turning left, going straight and turning right to the total flow of the inlet at each entrance of the roundabout, combined with the principle of equal queuing length, for the roundabout entrance Perform lane function division. 3. The traffic control method for an urban multi-lane roundabout according to claim 2, wherein the division of lane functions comprises: determining the number of lane groups of each entrance based on the geometric layout of the roundabout; calculating the number of lanes to be greater than one Lane groups and other queuing length flows; determine the lane functions in order from left to right. 4. urban multi-lane roundabout traffic control method according to claim 3, is characterized in that, calculating the queuing length flow such as the lane group whose number of lanes is greater than one comprises:

In the formula,

is the equal-queue-length flow of the lane group LG;

is the peak hourly flow in the flow direction of the d inlet road i obtained from the investigation; N _LG is the number of lanes included in the lane group LG. 5. The urban multi-lane roundabout traffic control method according to claim 3, characterized in that, according to the constraint of the equal queue length flow Va, the steering flow is sequentially allocated to the lane, and the lane function is determined according to the flow steering. 6 . The traffic control method for an urban multi-lane roundabout according to claim 5 , wherein, according to the lane functions of each entrance of the roundabout, design signs indicating the lane function of the entrance road dedicated to the roundabout. 7 . 7. An urban multi-lane roundabout traffic control system, characterized in that, comprising: The acquisition module is used to analyze and obtain the flow demand in each direction of each entrance of the roundabout and its temporal and spatial distribution characteristics based on the flow data of the roundabout; The analysis module is used to analyze the spatial distribution characteristics of the flow demand in each direction of each inlet of the roundabout based on the flow demand in each direction of each inlet of the roundabout and its temporal and spatial distribution characteristics; The determination module is used to divide the lane function at the entrance of the roundabout in combination with the principle of equal queue length, and obtain the traffic plan according to the function division result. 8. A computer device comprising a memory and a processor, the processor and the memory being in communication with each other, the memory storing program instructions executable by the processor, the processor calling the program instructions to execute The traffic control method for an urban multi-lane roundabout according to any one of claims 1-6. 9. An electronic device, comprising a memory and a processor, wherein the processor and the memory communicate with each other, the memory stores program instructions executable by the processor, and the processor invokes the The program instructions execute the traffic control method for an urban multi-lane roundabout according to any one of claims 1-6. 10. A computer-readable storage medium, characterized in that it stores a computer program, and when the computer program is executed by a processor, the urban multi-lane roundabout traffic control according to any one of claims 1-6 is realized method.

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