Method for estimating road section free flow velocity and intersection upstream arrival flow rate
A technology of flow speed and intersection, which is applied to the traffic control system of road vehicles, traffic flow detection, traffic control system, etc. It can solve the problem of not taking into account the randomness of vehicle driving, the rationality is questionable, and the arrival situation cannot be estimated separately, etc. problems, to achieve the effect of low requirements for data accuracy and completeness
Active Publication Date: 2019-08-20
SOUTHEAST UNIV
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Based on GPS data, Zheng et al. assumed that the arrival of upstream vehicles obeyed a time-based Poisson process, and summarized the arrival flow estimation problem into a maximum likelihood problem, and used the expectation maximization algorithm to solve the problem to obtain the estimated flow value. It can obtain the arrival flow within a certain time interval, and it is impossible to estimate the arrival situation upstream of the intersection during the red light period and the green light period of the phase, so it cannot be used as the basis for evaluating the effect of the arterial coordinated control scheme
In addition, there is currently no good method for estimating the free-flow velocity of road sections at home and abroad. Generally, empirical speed or road design speed is used as the free-flow velocity of road sections.
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[0040] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, present embodiment implements under the premise of technical solution of the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention.
[0041] Such as figure 1As shown, the lane 1 at the west entrance of the intersection of Zhonghuayuan Road and Fengjing Road in Kunshan City, Jiangsu Province is taken as the research object. 5. The upstream intersection is the Zhonghuayuan Road-Renmin Road intersection. The detector numbers corresponding to the three coming entrances of the intersection are 710, 711 and 712 respectively, and the control machine number is 236. Channelization scheme and detector configuration See figure 1 .
[0042] 9:00-16:00 is selected as the research period, and the relevant number plate detector information and timing ...
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The invention discloses a method for acquiring single lane road section free flow velocity and upstream arrival flow rate from historical license plate data based on Bayesian posteriori distribution.A single lane and upstream and downstream intersections thereof are taken as research objects, a posteriori distribution function with vehicle free flow velocity, red light time arrival flow rate andgreen light time arrival flow rate as parameters is established, license plate recognition data is taken as a sample, parameter estimation is executed through a M-H algorithm, and probability distribution of each parameter is obtained. In the method provided by the invention, upstream vehicle arrival within a cycle is divided into two situations including vehicle arrival during phase red light period and vehicle arrival during phase green light period according to a timing scheme, and arrival flow rate distributions under the two situations are respectively estimated, meanwhile, the distributions obtained through estimation reflect main line vehicle flow fluctuation characteristics to a certain degree, and an estimation result can provide references for evaluation and fine adjustment of amain line coordinated timing scheme.
Description
technical field [0001] The invention relates to the field of traffic management and control, in particular to a method for estimating the free flow velocity of a road section and the arrival flow rate upstream of an intersection. Background technique [0002] In the current field of traffic management and control, signal control of traffic flow is one of the important means to improve the efficiency of road network operation. According to the different scope of traffic control, signal control can be divided into single point control, arterial coordinated control and regional coordinated control. Due to the complexity of the urban road network system and the interrelationship and mutual influence between adjacent intersections, for the arterial road system, single-point control cannot solve its traffic problems, so that the traffic flow on the arterial road can run safely and efficiently. The arterial coordinated control is adopted to improve the traffic service level of the...
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IPC IPC(8): G08G1/01
CPCG08G1/0129G08G1/0133G08G1/0145
Inventor 夏井新叶含珺安成川陆振波刘佳超严颖王寅朴
Owner SOUTHEAST UNIV