交通运输系统工程与信息

交通运输系统工程与信息 ›› 2016, Vol. 16 ›› Issue (1): 64-70.

• 智能交通系统与信息技术 • 上一篇    下一篇

基于延误和事故损失的高速公路可变限速控制

王磊1,2，林永杰*2   

  1. 1. 长安大学公路学院，西安710064；2. 美国西北大学土木与环境工程系，美国埃文斯敦60208)
  • 收稿日期:2015-09-11 修回日期:2015-10-29 出版日期:2016-02-25 发布日期:2016-02-25
  • 作者简介:王磊(1983-)，男，陕西榆林人，博士生.
  • 基金资助:

    国家留学基金委项目/China Scholarship Council ([2014]3026)；国家自然科学基金/National Natural Science Foundation of China（51308335）.

Variable Speed Limit on Freeway Based on the Cost of Traffic Delay and Crash Damage

WANG Lei 1,2, LIN Yong-jie 2   

  1. 1. School of Highway Engineering, Chang’an University, Xi’an 710061, China; 2. Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL 60208, USA)
  • Received:2015-09-11 Revised:2015-10-29 Online:2016-02-25 Published:2016-02-25

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被引次数

1

摘要：

以交通检测系统获取的车道流量和速度为模型输入，分别提出基于延误损失、 事故损失和综合损失等3 类步进式可变限速控制.综合现有基于流量和基于车速离散性 算法估计了高速公路事故发生率，提出了基于延误和事故发生率的路段综合损失计算方 法.以青兰高速莱芜区约20 km的路段为实例，模拟了8 组可变限速牌，通过微观仿真验证 了提出的3 种算法.结果证明，相比于静态控制，建立的3 种模型均显著降低了主线车流的 停车次数、停车延误和综合延误，改善了车辆行驶的平稳性，但主线车辆旅行时间略有增 加.根据敏感性分析发现，随着驾驶员对限速值服从率的下降，可变限速控制的效益也逐 渐降低，尤其低于80%时，下降显著；当低于60%时，基本保持不变.

关键词: 智能交通, 可变限速控制, 步进式控制, 高速公路, 交通损失

Abstract:

Taking traffic volume and speed collected by traffic detection system as input variables, this paper proposes three kinds of step-by-step variable speed limit control models to minimize estimated delay cost, crash cost and comprehensive cost, respectively. The freeway crash rate is estimated based on volumeover- capacity and speed deviation by the existing model, and then the comprehensive cost is computed in terms of estimated delay and crash rate. In tests that used field freeway from about 20km segment of Qinglan freeway with eight variable speed limit signs, these developed three controls show promise in reducing the numbers of vehicle stops, stopped delay and equivalent travel delay based on micro simulation results, smoothing traffic speed and improving traffic safety. Nevertheless, travel time of freeway vehicles is increased a little. Additionally, sensitivity analysis of driver compliance rate indicates that benefits of variable speed limit are gradually reduced as compliance rate decreased. When the compliance rate is below 80%, benefits are significantly decreased; and benefits are essentially unchanged if it is less than a threshold of 60%.

Key words: intelligent transportation, variable speed limit, step control, freeway, traffic cost

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