Stability and safety evaluation of mixed traffic flow with connected automated vehicles on expressways
Connected automated vehicles (CAVs) technology has deeply integrated advanced technologies in various fields, providing an effective way to improve traffic safety. However, it would take time for vehicles on the road to vehicles from human-driven vehicles (HDVs) progress to CAVs. Moreover, the Cooperative Adaptive Cruise Control (CACC) vehicle would degrade into the Adaptive Cruise Control (ACC) vehicle due to communication failure. First, the different car-following models are used to capture characteristics of different types of vehicles (e.g., HDVs, CACC, and ACC). Second, the stability of mixed traffic flow is analyzed under different penetration rates of CAVs. Then, multiple safety measures, such as standard deviation of vehicle speed (SD), time exposed rear-end crash risk (TER), time exposed time-to-collision (TET), and time-integrated time-to-collision (TIT) are used to evaluate the safety of mixed traffic flow on expressways. Finally, the sensitivity of traffic demand, the threshold of time-to-collision (TTC), and the parameters of car-following models are analyzed based on a numerical simulation. The results show that the ACC vehicle has no significant impact on the SD of mixed traffic flows, but it leads to the deterioration of TET and TIT, making the reduction proportion of TER slower. When the penetration rate exceeds 50%, the increase of CACC vehicles reduces traffic safety risks significantly. Furthermore, the increase in traffic demand and car-following parameters worsens traffic safety on expressways. This paper suggests that the CACC vehicles degenerate into ACC vehicles due to communication failure, and the safety risk of mixed traffic flow increases significantly. The application of CAVs can improve the stability and safety of traffic flow.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/oclc/1800052
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Supplemental Notes:
- © 2020 National Safety Council and Elsevier Ltd. All rights reserved. Abstract reprinted with permission of Elsevier.
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Authors:
- Yao, Zhihong
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0000-0001-6946-2367
- Hu, Rong
- Jiang, Yangsheng
- Xu, Taorang
- Publication Date: 2020-12
Language
- English
Media Info
- Media Type: Web
- Features: References;
- Pagination: pp 262-274
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Serial:
- Journal of Safety Research
- Volume: 75
- Issue Number: 0
- Publisher: Elsevier
- ISSN: 0022-4375
- Serial URL: http://www.sciencedirect.com/science/journal/00224375
Subject/Index Terms
- TRT Terms: Autonomous intelligent cruise control; Autonomous vehicles; Car following; Connected vehicles; Highway safety; Traffic flow; Vehicle mix
- Subject Areas: Highways; Safety and Human Factors; Vehicles and Equipment;
Filing Info
- Accession Number: 01762147
- Record Type: Publication
- Files: TRIS
- Created Date: Jan 11 2021 11:08AM