Combined connected vehicles and variable speed limit strategies to reduce rear-end crash risk under fog conditions

2019 ◽  
Vol 24 (5) ◽  
pp. 494-513 ◽  
Author(s):  
Yina Wu ◽  
Mohamed Abdel-Aty ◽  
Ling Wang ◽  
Md Sharikur Rahman
Keyword(s):  
Crash Risk ◽  
Connected Vehicles ◽  
Speed Limit ◽  
Variable Speed ◽  
Variable Speed Limit

scholarly journals Enhancing Freeway Safety through Intervening in Traffic Flow Dynamics Based on Variable Speed Limit Control

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Jinming You ◽  
Shouen Fang ◽  
Lanfang Zhang ◽  
John Taplin ◽  
Jingqiu Guo
Keyword(s):  
Real Time ◽  
Traffic Flow ◽  
New Technologies ◽  
Flow Dynamics ◽  
Crash Risk ◽  
Speed Limit ◽  
Variable Speed ◽  
Variable Speed Limit ◽  
Traffic Conditions ◽  
Safety Research

New technologies and traffic data sources provide great potential to extend advanced strategies in freeway safety research. The High Definition Monitoring System (HDMS) data contribute comprehensive and precise individual vehicle information. This paper proposes an innovative Variable Speed Limit (VSL) based approach to manage crash risks by intervening in traffic flow dynamics on freeways using HDMS data. We first conducted an empirical analysis on real-time crash risk estimation using a binary logistic regression model. Then, intensive microscopic simulations based on AIMSUN were carried out to explore the effects of various intervention strategies with respect to a 3-lane freeway stretch in China. Different speed limits with distinct compliance rates under specified traffic conditions have been simulated. By taking into account the trade-off between safety benefits and delay in travel time, the speed limit strategies were optimized under various traffic conditions and the model with gradient feedback produces more satisfactory performance in controlling real-time crash risks. Last, the results were integrated into lane management strategies. This research can provide new ideas and methods to reveal the freeway crash risk evolution and active traffic management.

Dynamic Variable Speed Limit Strategies for Real-Time Crash Risk Reduction on Freeways

2008 ◽  
Vol 2078 (1) ◽  
pp. 108-116 ◽  
Author(s):  
Mohamed Abdel-Aty ◽  
Ryan J. Cunningham ◽  
Vikash V. Gayah ◽  
Liang Hsia
Keyword(s):  
Risk Reduction ◽  
Real Time ◽  
Crash Risk ◽  
Speed Limit ◽  
Variable Speed ◽  
Dynamic Variable ◽  
Variable Speed Limit

Cycle-based variable speed limit methodology for improved freeway merging

2017 ◽  
Vol 11 (10) ◽  
pp. 632-640 ◽  
Author(s):  
Li Zhang ◽  
Lei Zhang ◽  
David K. Hale ◽  
Jia Hu ◽  
Zhitong Huang
Keyword(s):  
Speed Limit ◽  
Variable Speed ◽  
Variable Speed Limit
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