Presignal-based active public traffic signal priority control method
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A signal priority and control method technology, applied in the traffic control system of road vehicles, traffic control systems, instruments, etc., can solve the problem of lack of priority service for public transport vehicles
Inactive Publication Date: 2011-11-09
SOUTHEAST UNIV
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However, affected by the existing research results abroad, the research direction in our country also focuses on the model algorithm and applicable conditions of the two control strategies of green light extension and red light shortening. , these two control strategies lack the priority service for the bus vehicles on the entrance road whose traffic direction is red light signal and the next execution phase is still red light signal
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[0124] 4.6 Implement the red light shortening control strategy. (see point 7 of the detailed description)
[0125] 5. The logic structure and parameter model of the green light extension control strategy. (see Image 6 )
[0126] A1) Calculate the required green light extension time g 1 , execute step A2), the calculation formula is:
[0127] g 1 =(Q 0 11 -g 1 Δt )+L 2 / v
[0128] In the formula, Q 0 11 : Green light extends the duration of the current phase under control;
[0129] g 1 Δt : The remaining time of the current phase when the priority bus arrives at the main stop line;
[0130] L 2 : The length of the bus trajectory from the main parking line to when the bus enters the exit lane;
[0131] v: the average speed of the bus detected by the detector,
[0132] where L 2 For the determination method, please refer to point 9 of the specific implementation method.
[0133] A2) Control parameter initialization, let the compression signal cycle number be...
Embodiment 1
[0232] Through the field data collection of the four-phase signal control intersection of Danfeng Street-Dashiqiao Street in Nanjing, the peak hour traffic volume of the intersection is obtained, as shown in the following table:
[0233] Table 1 Peak Hour Flow Meter at Danfeng Street-Dashiqiao Street Intersection (veh / h)
[0234]
[0235] The geometric layout of the four entrance lanes at the intersection is: 3 dedicated entrance lanes (one for left-turn, one for straight, and one for right-turn), and two exit lanes. The signal timing at the intersection is: go straight from north to south (37s), turn left from north to south (17s), go straight from east to west (29s), and turn left from east to west (13s). There are no restrictions on right turns for all vehicles.
[0236] Using VISSIM micro-simulation software to implement the pre-signal-based active bus signal priority control method at the intersection, the simulation model is established respectively before and after ...
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Abstract
The invention discloses a presignal-based active public traffic signal priority control method, which aims to ensure that the service level of public traffic vehicles which pass across crossings is improved to the greatest extent while the service level of social vehicles which pass across the crossings is not obviously reduced. The method comprises the following steps of: firstly, assembling detectors at the crossings which accord with conditions, and arranging a signal machine with computer programs and a signal lamp; secondly, setting green time differences between presignal stop lines andmain signals as well as between the presignal stop lines and presignals; thirdly, judging whether to give signal priority or not according to the operating states of crossings when the detectors detect a public traffic priority application; fourthly, judging the category of an active public traffic signal priority control strategy to be executed according to the current phase state; and finally, realizing signal priority service to the public traffic vehicles according to the control logic and the algorithm of three active public traffic signal priority control strategies of prolonging green light time, inserting public traffic phases and shortening red light time.
Description
technical field [0001] The invention relates to a bus signal priority control method, in particular to an active bus signal priority control method combining pre-signal technology at multi-phase signal control intersections to realize bus priority traffic. Background technique [0002] The active bus signal priority control method is based on the bus arrival information collected by the vehicle detectors installed on the intersection entrance, and rationally adopts control strategies such as extending green lights, shortening red lights, inserting phases, skipping phases, and phase inversions to adjust the original signal The timing parameters realize the priority of public transport at the intersection, and maximize the capacity and service level of public transport at the intersection. [0003] After entering the 21st century, North America, Europe and other developed countries have paid more and more attention to the research on the priority control method of bus signals ...
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