Car following rear-end conflict risk of freeway work zone(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年02期
- Page:
- 81-88
- Research Field:
- 交通工程
- Publishing date:
Info
- Title:
- Car following rear-end conflict risk of freeway work zone
- Author(s):
- LI Yun; ZHANG Sheng-rui; RU Mian-bo
- 1. Jiangsu Key Laboratory for Traffic and Transportation Security, Huaiyin Institute of Technology, Huaian 223003, Jiangsu, China; 2. Faculty of Transportation Engineering, Huaiyin Institute of Technology, Huaian 223003, Jiangsu, China; 3. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China
- Keywords:
- traffic engineering; work zone; rear-end conflict; driver characteristics; risk threshold
- PACS:
- U491.3
- DOI:
- -
- Abstract:
- In order to quantitatively study the car following rear-end conflict risk degree of the warning area, upstream transition area, buffer space and operation area of freeway work zone on the condition that traditional method of traffic conflict evaluation can not be applied to freeway work zone, taking the vehicle deceleration rate as intermediate variable, the relationship between collision time function TTC and the driver’s characteristics was used to study the car following rear-end conflict threshold. According to physiological and psychological reactions of the driver corresponding to different vehicle deceleration rates, the relationship model among collision time function, deceleration rate and the driver’s physiological and psychological characteristics was established, and the determination method of car following rear-end conflict risk threshold in freeway work zone based on the driver’s characteristics were proposed. According to the division scope of vehicle deceleration rates and the relationship between deceleration rate and collision time function, the car following rear-end conflict risk degree of freeway work zone in each section were divided into four risk levels, namely， safe, not very safe, general conflict and serious conflict. Taking the reconstruction work zone of Xi’an to Lintong Freeway as an example, the field data was used to evaluate the conflict risk degree of freeway work zone in each section. The results show that the car following rear-end conflict risk in warning area is the highest, the conflict risk threshold, number conflict points and conflict percentage of which are significantly higher than that of other sections. The greater the traffic volume, the higher the risk of car following rear-end conflict for the same section. The research results can predict the possibility of car following rear-end conflict of freeway work zone in each section to prevent traffic accidents. At the same time, the traffic safety level can be determined quantitatively.
Last Update: 2017-04-07