CN106530709A - User-oriented highway traffic index publishing system - Google Patents
User-oriented highway traffic index publishing system Download PDFInfo
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- CN106530709A CN106530709A CN201611164787.0A CN201611164787A CN106530709A CN 106530709 A CN106530709 A CN 106530709A CN 201611164787 A CN201611164787 A CN 201611164787A CN 106530709 A CN106530709 A CN 106530709A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0125—Traffic data processing
- G08G1/0133—Traffic data processing for classifying traffic situation
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0137—Measuring and analyzing of parameters relative to traffic conditions for specific applications
- G08G1/0141—Measuring and analyzing of parameters relative to traffic conditions for specific applications for traffic information dissemination
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Abstract
The invention discloses a user-oriented highway traffic index publishing system comprising a traffic data acquisition module and a traffic index division module, determination module and publishing module. The traffic index division module constructs a traffic flow fundamental diagram to perform traffic state grade division according to the historical traffic flow rate and speed data and then converts the division result into the traffic index grade and determines the traffic density critical threshold of different levels of traffic index values of the same index grade. The traffic index determination module performs traffic state and traffic index grade division on the traffic flow rate and speed data acquired by the traffic data acquisition module and determines the concrete traffic index value. The traffic index publishing module publishes the traffic index grade information in real time. According to the constructed user-oriented highway traffic index publishing system, the practical application of the traffic index system and application technology on the highway is supported so that the safe, smooth and high-quality highway traveling service is provided for travelers.
Description
Technical field
The present invention relates to Operation and Management of Expressway field, especially a kind of user oriented freeway traffic index are sent out
Distribution system.
Background technology
, in Rapid development stage, highway vehicle flowrate is also year by year for the construction of China's highway in recent years and operation
It is incremented by, especially during festivals or holidays, highway is susceptible to the phenomenon of congestion.Freeway management person is faced with present and hands over
The challenge that logical imbalance between supply and demand brings, the how traffic circulation state for being understood on highway in time directly perceived, and on this basis
Science management and control is carried out to expressway entrance and exit, is become and is solved the problems, such as traffic supply and demand, and provide more excellent for highway user
Matter is serviced and alleviates the key of highway congestion.
In recent years, the concept of road traffic index becomes the focus of domestic and international field of traffic research, road traffic index (and
Claim traffic congestion index) refer to the method expression road traffic operation congestion level for quantifying.Road traffic indicial response one
Determine the impression of the average speed of road and people to road traffic congestion degree in scope.In general, traffic index numerical value is got over
Greatly, show that road traffic gets over congestion, numerical value is less, show that traffic is more unimpeded.
In sum, current Chinese scholars have carried out numerous studies to urban highway traffic index, and in the U.S.,
The cities such as Beijing of the cities such as Japan and the country, Shanghai, Shenzhen have carried out explorative research.Urban highway traffic index is all with speed
Spend the mode quantificational description road traffic running status as index.However, only having some scholars then from multi objective and cluster
The mode that algorithm quantifies is studying freeway traffic running status, but index of correlation and clustering algorithm content fail fully should
Use freeway traffic index.And almost do not have research of the scholar to freeway traffic index number system to visit with application
Beg for, further grasp traffic status of express way research and be also particularly important.Therefore freeway traffic index is based on herein
Intension, with reference to freeway traffic running status situation, the statistic algorithm framework traffic index model applied is easy in selection, and
Propose that complete traffic index issues application strategy, so as to build user oriented freeway traffic index number system, and then more preferably
Serve highway user trip.
The content of the invention
The technical problem to be solved is, there is provided a kind of user oriented freeway traffic index issues system
System, can recognize traffic congestion situation, and then degree, the opportunity of accurate assurance gateway management and control, root based on traffic index system
Gateway flow is rationally controlled according to the scope and degree of congestion, service management level is further lifted for highway and skill is provided
Art is supported and is ensured, provides the highway trip service of safe, unimpeded and high-quality for traveler.
To solve above-mentioned technical problem, the present invention provides a kind of user oriented freeway traffic index delivery system,
Including：
Traffic index division module, builds traffic for the historical traffic flow rate according to express highway section and speed data
Stream parent map simultaneously carries out cluster computing to the data point in parent map, first divides traffic status of express way grade, then with traffic
Index ranking correspondence is converted, and determines the concrete traffic index level value scope of each data point, is finally determined and is divided same
The traffic density threshold limit value of varying level traffic index numerical value in index ranking；
Traffic data collection module, for set sampling period Real-time Collection express highway section traffic flow rate and
Speed data；
Traffic index determining module, for the traffic flow rate and speed data of Real-time Collection are first carried out traffic behavior and friendship
Logical index ranking is divided, then determines specific traffic index numerical value based on traffic density；
And traffic index release module, the traffic index grade or traffic for the concrete express highway section of real-time release
Exponential number.
The traffic index division module, including：
Historical data base construction unit, for selecting the traffic flow rate and speed historical data of collection, builds historical data
Storehouse；
Traffic flow parent map construction unit, for being built at a high speed based on the magnitude of traffic flow in historical data base and speed data
Traffic Stream of Road parent map；
Traffic behavior grade classification unit, for the clusters number according to the traffic status of express way for determining, to basic
Data point in figure carries out cluster computing, and traffic status of express way is divided into different brackets；
Traffic index converting unit, for converting traffic status of express way grade corresponding with traffic index grade, really
Determine the corresponding concrete traffic index grade of each data point, and combine the traffic index level value scope for setting, determine each
The corresponding traffic index level value scope of data point；
And, traffic density threshold computation unit, for based on data point in same traffic index level value scope
The cumulative percent histogram of density values, with reference to different traffic index value class numbers in the traffic index rate range,
It is determined that dividing the threshold limit value of varying level traffic index numerical value in same index ranking.
Parent map and five intersecting through-flow theories are based in the traffic behavior grade classification unit, by the data in parent map
Point is polymerized to 5 classes with K-means clustering algorithms, corresponding to free stream, synchronous stream and blocking stream mode and the mistake between them
Cross state；Traffic index is quantified to be divided into 5 grades in the traffic index converting unit, by traffic status of express way grade
Correspond with traffic index grade and convert, using numerical value [0-10] as traffic index number range, [0-2] be the 1st grade,
(2-4] for the 2nd grade, (4-6] for the 3rd grade, (6-8] for the 4th grade and (8-10] for the 5th grade.
The traffic index division module automatically updates historical data base and re-starts friendship according to the calculating cycle of setting
Logical index is divided and is calculated.
The traffic data collection module gathers highway each road by the sampling period of 5min with 2km as long measure
The traffic flow rate and speed data of section.
The traffic index release module the flat peak period issuing time at intervals of 10-15min, in sending out for peak period
Cloth time interval is 5-10min.
The traffic index release module in several ways, is sent out in real time including variable information board, website and mobile App ends
The traffic index of cloth express highway section, and by different colors distinguishing different traffic index grades.
Compared with prior art, intension of the present invention based on freeway traffic index, runs with reference to freeway traffic
State status, selection are easy to the statistic algorithm framework traffic index model applied, and propose that complete traffic index issues application
Strategy, so as to build user oriented freeway traffic index delivery system, can be gathered around based on the identification traffic of traffic index system
Stifled situation, and then degree, the opportunity of accurate assurance gateway management and control, it is reasonable to gateway flow according to the scope and degree of congestion
Control, further lifts service management level for highway and provides technical support and guarantee, provide safe, unimpeded for traveler
With the highway trip service of high-quality.
Description of the drawings
System module schematic diagrames of the Fig. 1 for the embodiment of the present invention.
Fig. 2 is test point traffic flow rate-speed macroscopic view parent map in the embodiment of the present invention.
The schematic diagram that Fig. 3 is divided for the express highway section traffic behavior in the embodiment of the present invention.
Fig. 4 is the traffic density numerical value cumulative percent histogram in the embodiment of the present invention.
Specific embodiment
With reference to specific embodiment, the present invention is further elucidated, it should be understood that these embodiments are merely to illustrate the present invention
Rather than the scope of the present invention is limited, and after the present invention has been read, various equivalences of the those skilled in the art to the present invention
The modification of form falls within the application claims limited range.
As shown in figure 1, a kind of user oriented freeway traffic index delivery system disclosed in the embodiment of the present invention, main
To include traffic index division module, traffic data collection module, traffic index determining module and traffic index release module.Its
Middle traffic index division module is based primarily upon the traffic flow rate in historical data base and speed data carries out traffic index division, main
To include historical data base construction unit, for selecting the traffic flow rate and speed historical data of collection, build historical data base；
Traffic flow parent map construction unit, for building freeway traffic based on the magnitude of traffic flow in historical data base and speed data
Stream parent map；Traffic behavior grade classification unit, for the clusters number according to the traffic status of express way for determining, to basic
Data point in figure carries out cluster computing, and traffic status of express way is divided into different brackets；Traffic index converting unit, uses
In by conversion traffic status of express way grade corresponding with traffic index grade, determine that the corresponding concrete traffic of each data point refers to
Number grade, and the traffic index level value scope of setting is combined, determine the corresponding traffic index number of degrees of each data point
Value scope；And, traffic density threshold computation unit, for based in same traffic index level value scope data point it is close
The cumulative percent histogram of number of degrees value, with reference to different traffic index value class number in the traffic index rate range, really
Surely divide the threshold limit value of varying level traffic index numerical value in same index ranking.
Traffic data collection module for set sampling period Real-time Collection express highway section traffic flow rate and
Speed data, and store data into real-time data base.Traffic index determining module for by the traffic flow rate of Real-time Collection and
Speed data first carries out traffic behavior and traffic index grade classification, then determines specific traffic index number based on traffic density
Value.Specially calculate the magnitude of traffic flow and the corresponding data point of speed values and each traffic behavior cluster centre of Real-time Collection away from
From the data point is divided into specific traffic status of express way grade first；The corresponding traffic density number of data point is calculated again
Value, determines specific traffic index numerical value according to traffic density threshold limit value.Traffic index release module has for real-time release
The traffic index grade or traffic index numerical value of body express highway section.
As urban road has substantial amounts of floating car data, can be according to this Database urban highway traffic index.
But highway can only rely on fixed testing equipment picking rate data, another aspect highway testing equipment adopt
The higher data on flows of collection relative accuracy, such that it is able to by the use of flow and speed data as express highway section traffic index
Index.Traffic study station testing equipment is chosen as the data source of express highway section traffic flow data sampling, is gathered to be verified
The traffic data of express highway section, including traffic flow rate and speed, its sampling period be per 5 minutes once, and build institute
Choose the historical data base of express highway section.
As parent map theory can be used as the model and method for quantifying relation between traffic flow parameter in section or road network, institute
So that the traffic flow parent map feature of highway different time sections can be explored, just by building freeway traffic flow parent map
In the traffic circulation situation for grasping highway, and then initial analysis freeway traffic operation conditions.
Distributing position in traffic index division module according to scatterplot in basic graph model, comprehensive parent map and five Communicatings
Stream is theoretical, determines that the clusters number of traffic status of express way, access speed and flow, as primary evaluation index, are used in advance
Traffic status of express way is divided into different brackets by K-means clustering algorithms.
The traffic behavior grade divided based on highway, it is relative to should determine that freeway traffic index ranking, so as to
Traffic status of express way grade is corresponded into conversion with its traffic index grade, and determines the concrete traffic of each data point
Index ranking, with reference to setting traffic index level value scope, determines the traffic index level value model that each data point determines
Enclose.
Based on each data point place traffic index level value scope, the density values of data point in each classification are calculated
The ratio of speed (flow rate with), counts and draws the cumulative percent histogram of all data point density values of each classification, with reference to
In the traffic index rate range, different traffic index value class numbers, set traffic density percentage critical numerical value, and make
To divide the threshold limit value of varying level traffic index numerical value in same index ranking, so that it is determined that each data point is accordingly referring to
Concrete traffic index numerical value in number grade.
Traffic index release module is issued with reference to highway index based on the freeway traffic index ranking for obtaining
Implementation strategy can carry out real-time index issue, and implementation strategy specifically includes pavement section, time interval, color grade, issue shape
The aspects such as formula.Freeway traffic index represents different grades of corresponding strategies respectively using different colours, further defines at a high speed
Highway basic road division principle and method and optimum release cycle, and the traffic index for user adopts different realities
When published method.
Below with the implementation process that present system is illustrated with reference to specific example.With Shanghai-Nanjing Expressway Wuxi Section, pile No.
Intercommunication testing equipment in K1102+200 Wuxis is research object, arranges testing equipment in test point place section, is microwave traffic flow
Testing equipment.
Test point is sitting in the intermodulation collecting device in section with 5 minutes as a sample unit collection traffic flow rate and speed,
It is on 30 days-October of September in 2016 7 during Data Collection, sets up detection data database to carry out research and analysis.In order to protect
The accuracy of model of a syndrome, it is ensured that model can reflect the ruuning situation of traffic flow modes, sample should be sufficiently large, according to statistics
Data are 2189.
The test point traffic flow rate-speed macroscopic view parent map is drawn with three parameter parent map relations, as shown in Figure 2.Root
Typical case's parabolic convex to the right is presented according to flow rate and the graph of a relation of speed, the distribution of National Day data scatterplot is more similar, passes through
Ability is probably demarcated as 7000pcu/h, and speed integrated distribution is interval in 20-100km/k, and average speed numerical value is slightly above current
Speed values under ability.With reference to above to traffic status of express way correlation analysis, the highway intermodulation station during National Day
Traffic flow data scatterplot be mainly distributed on that whole traffic behavior is interval, i.e., all traffic status of express way are all present, for
Traffic index model construction may be representative.
The drafting that respective quadrature adjusts station three parameter parent map of place road traffic delay is carried out based on using gathered data point, is used
The traffic flow of traffic three-phase and its status transition are theoretical, observe and learn from figure, and data scatterplot spreads over free stream, synchronous stream and blocks up
Plug flow state and the transition state between them.Therefore cluster analysis is carried out using K-means algorithms, need to will cluster number of targets
It is set as 5 classes, so as to obtain the traffic behavior dividing condition in specific Shanghai-Nanjing Expressway Wuxi intercommunication test point place section,
As shown in Figure 3.
Intercommunication traffic behavior in Wuxi divides figure Green and represents and freely flows, and redness is represented and freely flows the-synchronous transition shape for flowing
State, yellow represent synchronous stream mode, and blueness represents the transition state of synchronous stream-blocking stream, and purple represents blocking stream mode, with this
As the freeway traffic index ranking division result of ultimate criterion.And the cluster centre of traffic flow rate and speed, such as table 1
It is shown.
1 Wuxi intercommunication intermodulation station traffic behavior cluster centre of table
Based on Shanghai-Nanjing Expressway traffic behavior grade classification result, and use for reference " the road friendship of correlation in most of city
The quantization method of logical operation index ", traffic index is quantified to be divided into 5 grades, and respectively I levels (unimpeded), II levels is (substantially smooth
It is logical), III level (slight congestion), IV levels (moderate congestion) and V levels (heavy congestion or obstruction).
The traffic behavior grade divided based on highway, and use for reference " the road traffic fortune of correlation in most of city
The numerical quantization method of row index ", using numerical value [0-10] as traffic index number range, [0-2] be the 1st grade, (2-4]
For the 2nd grade, (4-6] for the 3rd grade, (6-8] for the 4th grade and (8-10] for the 5th grade, with reference to setting traffic index grade
Number range, determines the traffic index level value scope that each data point determines.
Based on each data point place traffic index level value scope, it is determined that 2 in the traffic index rate range
Traffic index value class number, calculates the density values ratio of speed (flow rate with) of data point in each classification, counts and paint
Make the cumulative percent histogram of all data point density values of each classification.
The cumulative percent histogram of all data point density values in I index rankings is drawn, is illustrated in fig. 4 shown below, root
Density cumulative percent Figure 50 % frequencies are chosen as critical point, the horizontal stroke corresponding to which according to divided class number in same grade
Coordinate density values 4pcu/km/l, therefore data point is less than 4pcu/km/l in I index rankings, traffic index is confirmed as
1；More than 4pcu/km/l, traffic index is confirmed as 2, and other traffic index rate ranges can be to all data according to the method
The concrete traffic index of point is determined.
According to the traffic index grade classification color in other cities, this project choose respectively green, light green color, it is light yellow,
Yellow, redness are used as freeway traffic index color grading.
Meet traffic index for freeway traffic and issue and require, to conventional pavement section length 500m, 1km, 2km and
The pluses and minuses of 5km are analyzed, and by above-mentioned pavement section length than selecting, adopt 2km for long measure, concrete such as table 2.
2 pavement section length pluses and minuses of table compare
For Shanghai-Nanjing Expressway traffic index release cycle, an interval time, its lower limit need to be issued towards the public
For data acquisition minimum time interval be 1min, be limited to thereon the traffic index release cycle time for 15min (because status transition need
Will).Traffic index issuing time interval should consider time interval upper and lower bound, the demand such as data source with actual conditions
Meet minimum interval to obtain and the requirement of actual large-scale calculations, can use 1-5min；Otherwise, 10- can be chosen in the flat peak period
15min (avoids frequently releasing news)；5-10min can be chosen in peak period.Optional 5min is considered as issue
Time interval, and match with intermodulation station gathered data time interval.
Data of the basic data that traffic circulation index is calculated from existing intermodulation system in the road of built-up areas, in order to
Real-time accuracy rate is improved as far as possible, and traffic index system is automatically updated once according to calculating cycle.With reference to the data of Real-time Collection,
The traffic behavior in intermodulation station place section, and the corresponding Shanghai-Nanjing Expressway traffic index that converts mutually are should determine that further, from
And issued on variable information board, related web site and app in time, so that public user real-time query Shanghai-Nanjing Expressway traffic refers to
Number, there is provided real-time highway road section traffic volume status information, can more directly serve in the demand of public user in real time trip.
Claims (7)
1. a kind of user oriented freeway traffic index delivery system, it is characterised in that include：
Traffic index division module, builds traffic flow base for the historical traffic flow rate according to express highway section and speed data
This figure simultaneously carries out cluster computing to the data point in parent map, first divide traffic status of express way grade, then with traffic index
Grade correspondence is converted, and determines the concrete traffic index level value scope of each data point, is finally determined and is divided same index
The traffic density threshold limit value of varying level traffic index numerical value in grade；
Traffic data collection module, for the traffic flow rate and speed of the sampling period Real-time Collection express highway section of setting
Data；
Traffic index determining module, for the traffic flow rate and speed data of Real-time Collection being carried out traffic behavior first and traffic refers to
Number grade classification, then specific traffic index numerical value is determined based on traffic density；
And traffic index release module, for the traffic index grade or traffic index of the concrete express highway section of real-time release
Numerical value.
2. a kind of user oriented freeway traffic index delivery system according to claim 1, it is characterised in that institute
Traffic index division module is stated, including：
Historical data base construction unit, for selecting the traffic flow rate and speed historical data of collection, builds historical data base；
Traffic flow parent map construction unit, for building highway based on the magnitude of traffic flow in historical data base and speed data
Traffic flow parent map；
Traffic behavior grade classification unit, for the clusters number according to the traffic status of express way for determining, in parent map
Data point carry out cluster computing, traffic status of express way is divided into into different brackets；
Traffic index converting unit, for by conversion traffic status of express way grade corresponding with traffic index grade, it is determined that often
The corresponding concrete traffic index grade of one data point, and the traffic index level value scope of setting is combined, determine each data
The corresponding traffic index level value scope of point；
And, traffic density threshold computation unit, for the density based on data point in same traffic index level value scope
The cumulative percent histogram of numerical value, with reference to different traffic index value class numbers in the traffic index rate range, it is determined that
Divide the threshold limit value of varying level traffic index numerical value in same index ranking.
3. a kind of user oriented freeway traffic index delivery system according to claim 2, it is characterised in that institute
Through-flow theories are intersected based on parent map and five in stating traffic behavior grade classification unit, the data point in parent map is used into K-
Means clustering algorithms are polymerized to 5 classes, corresponding to free stream, synchronous stream and blocking stream mode and the transition state between them；Institute
Traffic index is quantified to be divided into 5 grades in stating traffic index converting unit, traffic status of express way grade and traffic are referred to
Number grades correspond conversion, using numerical value [0-10] as traffic index number range, [0-2] be the 1st grade, (2-4] be
2nd grade, (4-6] for the 3rd grade, (6-8] for the 4th grade and (8-10] for the 5th grade.
4. a kind of user oriented freeway traffic index delivery system according to claim 1, it is characterised in that institute
State traffic index division module to automatically update historical data base according to the calculating cycle of setting and re-start traffic index division
Calculate.
5. a kind of user oriented freeway traffic index delivery system according to claim 1, it is characterised in that institute
Traffic data collection module is stated with 2km as long measure, with 5min as the traffic flow of sampling period collection freeway
Rate and speed data.
6. a kind of user oriented freeway traffic index delivery system according to claim 1, it is characterised in that institute
The issuing time that traffic index release module is stated in the flat peak period is spaced in the issuing time of peak period at intervals of 10-15min
For 5-10min.
7. a kind of user oriented freeway traffic index delivery system according to claim 1, it is characterised in that institute
State traffic index release module in several ways, including variable information board, website and mobile App ends real-time release highway
The traffic index in section, and by different colors distinguishing different traffic index grades.
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| CN110796867A (en) * | 2019-11-28 | 2020-02-14 | 沈阳世纪高通科技有限公司 | Road condition determining method and device |
| CN110796867B (en) * | 2019-11-28 | 2021-04-16 | 沈阳世纪高通科技有限公司 | Road condition determining method and device |
| CN114566047A (en) * | 2022-03-02 | 2022-05-31 | 中远海运科技股份有限公司 | Early warning method and system based on short-time circuit condition prediction algorithm |
| CN114664091A (en) * | 2022-04-26 | 2022-06-24 | 中远海运科技股份有限公司 | Early warning method and system based on holiday traffic prediction algorithm |
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