Journal
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
Volume 574, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physa.2021.125918
Keywords
Combined bottleneck; Cellular automata; Accident; Traffic flow
Categories
Funding
- National Natural Science Foundation of China [51468034, 71861024]
- Natural Science Foundation of Gansu Province, China [18JR3RA119, 1606RJZA017]
Ask authors/readers for more resources
This study investigates the impact of traffic accidents on traffic flow in the expressway ramp system using the classic KKW model, finding that accident congestion will propagate upstream under synchronized flow, and a combined bottleneck effect exists between accidents and ramps.
Many traffic accidents occur in the merging and diverging area of expressway and ramp, which forms the combination bottleneck of traffic accidents and ramp at the same time, and has a negative impact on traffic flow. Based on the classic KKW (Kerner-Klenov-Wolf) model of three-phase traffic flow theory, this paper introduces traffic accident and defines the priority rule of vehicle lane changing in front of the accident site, proposes the traffic flow model of expressway ramp system under the accident conditions, and simulates and analyzes the impact of traffic accident on the traffic flow under the open boundary condition. It is found that the congestion caused by the accident will not propagates to the upstream basically under the free flow, but will obviously propagate to the upstream under the synchronized flow. Besides, the combined bottleneck effect of accidents and on-ramp can be clearly found under synchronized flow. This work is helpful to understand the mechanism of traffic congestion and provide reference suggestions for traffic control under accident conditions. (C) 2021 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available