Two-stage parameter calibration method for highway traffic safety simulation analysis

A highway and traffic safety technology, applied in the field of traffic simulation, can solve the problems of no evaluation purpose, no simulation of traffic flow operation characteristics, poor effect, etc.

Active Publication Date: 2017-03-22
SOUTHEAST UNIV
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Problems solved by technology

However, most of the simulation models established in engineering practice use the default parameter values ​​of the simulation software or the parameter values ​​determined according to the engineer's experience. The simulation model reproduces the traffic flow in time and space. The running characteristics of the traffic flow make the simulation an animation effect that does not have the purpose of evaluation

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  • Two-stage parameter calibration method for highway traffic safety simulation analysis
  • Two-stage parameter calibration method for highway traffic safety simulation analysis
  • Two-stage parameter calibration method for highway traffic safety simulation analysis

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with embodiment and accompanying drawing.

[0036] The two-stage parameter calibration method of expressway traffic safety simulation analysis of the present invention comprises the following steps:

[0037] Step 10) collect the real-time traffic flow data of expressway, obtain the weather data in road geometry data and weather detection station, described real-time traffic flow data comprises traffic volume, space occupancy rate and speed; Further, collect real-time traffic as follows stream data:

[0038]On the expressway section, the distance between two adjacent traffic flow detection devices is 500 meters to 1500 meters, the distance between two adjacent environmental weather stations is 5 kilometers to 15 kilometers, and the traffic flow detection equipment and environmental weather The stations are evenly arranged along the expressway, and the traffic flow detection equipment described is an el...

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Abstract

The invention discloses a two-stage parameter calibration method for highway traffic safety simulation analysis. The method comprises the steps of 10) acquiring real-time traffic flow data, road design data and weather data of a highway; 20) building a real-time accident risk prediction model and a VISSIM simulation model; 30) performing first-stage parameter calibration: calibrating parameters remarkably influencing a simulated vehicle speed change; 40) performing second-stage parameter calibration: calibrating parameters remarkably influencing a simulated real-time accident risk value; and 50) if the speed and real-time accident risk of the VISSIM simulation model reach simulation precision, indicating that the calibration is finished, otherwise, calibrating excluded parameters in the two calibration steps to improve the simulation precision. According to the two-stage parameter calibration method for the VISSIM simulation model, provided by the invention, the accident risk value is further simulated on the basis of reproducing temporal and spatial variation of traffic flow, so that the VISSIM simulation can be enabled to directly evaluate a traffic accident risk.

Description

technical field [0001] The invention belongs to the field of traffic simulation, and relates to a method for automatic parameter calibration of highway traffic simulation by using a genetic algorithm. Background technique [0002] Microscopic simulation technology has been widely used in the field of traffic engineering, especially in the research of simulating highways with only motor vehicles as traffic components. A large number of studies have used simulation models to evaluate road traffic safety and operating effects. However, most of the simulation models established in engineering practice use the default parameter values ​​of the simulation software or the parameter values ​​determined according to the engineer's experience. The simulation model reproduces the traffic flow in time and space. The running characteristics of the traffic flow make the simulation an animation effect that does not have the purpose of evaluation. Contents of the invention [0003] Techn...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F2111/12
Inventor 徐铖铖欧阳鹏瑛刘攀俞灏
Owner SOUTHEAST UNIV
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