Optimized layout method for variable speed limit signs on expressway mainline

A technology of speed limit signs and express roads, which is applied in the field of traffic analysis, can solve problems such as the inability to ensure layout plans, lack of theoretical and technical support, etc., achieve good results, overcome strong subjectivity, and overcome random effects

Inactive Publication Date: 2016-08-31
SOUTHEAST UNIV
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Problems solved by technology

[0004] The problem to be solved by the present invention is: in the past, the variable speed limit signs were usually set according to the s

Method used

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  • Optimized layout method for variable speed limit signs on expressway mainline
  • Optimized layout method for variable speed limit signs on expressway mainline
  • Optimized layout method for variable speed limit signs on expressway mainline

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Embodiment Construction

[0016] The present invention is based on an accident risk prediction model, considering the length of dangerous roads under different risk thresholds, the traffic safety improvement effect and cost-benefit ratio of different layout schemes, and establishes an optimal layout method for variable speed limit signs on the main line of expressways. The flow of optimized layout method of variable speed limit control signs can be referred to figure 1 .

[0017] The first step is to periodically collect multiple sets of traffic flow, traffic density and speed data on expressways with variable speed limit control, such as figure 2 shown. The specific method is to set up an induction coil detector at a certain stake number on the expressway to record information such as the passing time, driving speed, headway, and vehicle length of each vehicle passing through the detector position. Speed ​​control period and no variable speed limit control period. Integrate the information collect...

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Abstract

The invention discloses an optimized layout method for variable speed limit signs on an expressway mainline. The optimized layout method comprises the following steps: identifying a hazardous bottleneck road section on an expressway based on an accident risk forecasting model, then determining the length of a variable speed limit control road section according to threshold value setting, setting various variable speed limit sign layout density schemes, solving an optimal control strategy for each scheme, and performing investment-benefit analysis aiming at different schemes to determine an optimal speed limit sign layout scheme. According to the optimized layout method, the shortcoming that no theoretical support is provided for variable speed limit sign layout in the conventional research is overcome; the length of the variable speed limit control road section and the speed limit sign layout density are determined according to a traffic safety improvement effect and an investment-benefit ratio, so that a variable speed limit control concept and the strategy can achieve the best benefit.

Description

technical field [0001] The invention belongs to the technical field of traffic analysis, in particular to a method for optimal layout of variable speed limit signs on main lines of expressways. Background technique [0002] The variable speed limit control technology obtains real-time traffic flow information from the traffic flow detector on the main line of the expressway, and actively adjusts the traffic flow operation by changing the speed limit value issued by the variable speed limit sign located on the roadside. As more and more expressways adopt variable speed limit control, a dynamic traffic control strategy, in the variable speed limit control system, the analysis of the influence of the layout position of variable speed limit signs on the use effect of variable speed limit becomes more and more important. Hair is important. [0003] Previous scholars have studied the layout scheme of traffic flow detection equipment on expressways, and the results show that when ...

Claims

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Application Information

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IPC IPC(8): G08G1/01
CPCG08G1/0125G08G1/0137
Inventor 李志斌刘攀王炜徐铖铖
Owner SOUTHEAST UNIV
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