An Impact Analysis of the Proportion of Adaptive Cruise Control Vehicles on the Safety of Mixed Traffic Flow at the Off-ramp Diverging Area

YI Zhenpeng; LI Wei; SHI Baixi; WANG Baojie

doi:10.3963/j.jssn.1674-4861.2022.01.002

Volume 40 Issue 1

Feb. 2022

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YI Zhenpeng, LI Wei, SHI Baixi, WANG Baojie. An Impact Analysis of the Proportion of Adaptive Cruise Control Vehicles on the Safety of Mixed Traffic Flow at the Off-ramp Diverging Area[J]. Journal of Transport Information and Safety, 2022, 40(1): 10-18. doi: 10.3963/j.jssn.1674-4861.2022.01.002

Citation:

YI Zhenpeng, LI Wei, SHI Baixi, WANG Baojie. An Impact Analysis of the Proportion of Adaptive Cruise Control Vehicles on the Safety of Mixed Traffic Flow at the Off-ramp Diverging Area[J]. Journal of Transport Information and Safety, 2022, 40(1): 10-18. doi: 10.3963/j.jssn.1674-4861.2022.01.002

Citation:

YI Zhenpeng, LI Wei, SHI Baixi, WANG Baojie. An Impact Analysis of the Proportion of Adaptive Cruise Control Vehicles on the Safety of Mixed Traffic Flow at the Off-ramp Diverging Area[J]. Journal of Transport Information and Safety, 2022, 40(1): 10-18. doi: 10.3963/j.jssn.1674-4861.2022.01.002

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An Impact Analysis of the Proportion of Adaptive Cruise Control Vehicles on the Safety of Mixed Traffic Flow at the Off-ramp Diverging Area

doi: 10.3963/j.jssn.1674-4861.2022.01.002

College of Transportation Engineering, Chang'an University, Xi'an 710064, China

Received Date: 2021-03-28
Available Online: 2022-03-31

Abstract

Abstract

Based on the analyses of driving behavior of manually operated, adaptive cruise control(ACC), and cooperative adaptive cruise control(CACC)vehicles, this paper investigates the impact of proportion of CACC vehicles on the safety of mixed-traffic-flow at off-ramp diverging areas in a simulated environment, which is established based on a car-following model and a lane-changing model. Specifically, a full velocity difference model, an ACC car-following model and a CACC car-following model are used as the longitudinal car-following models for manually operated, ACC, and CACC vehicles, respectively. A discretionary lane-changing model and a mandatory lane-changing model are customized to develop the lateral lane-changing model for all types of vehicles at the main and end sections of off-ramp diverging areas, respectively. Next, a set of evaluation indices for traffic safety are proposed based on the following parameters such as time-to-collision(TTC), time exposed time-to-collision(TET) and time integrated time-to-collision(TIT). The MATLAB software is used to analyze the safety for mixed traffic flows under the scenarios with different proportions of CACC vehicles. The results show that: when the proportion of CACC vehicles ranges between 40% and 50%, the safety of mixed traffic flow deteriorates most, TET and TIT increase by about 68% and 89%, respectively, and the speed dispersion coefficient is as large as more than 0.9. Study results also indicate that the risk of rear-end collision for mixed traffic flow can be effectively reduced by adding the mandatory lane-changing area(≤ 1 000 m)at the far-end of off-ramp diverging area.
- traffic safety,
- mixed traffic flow,
- rear-end collision risk,
- freeway off-ramp,
- cooperative adaptive cruise control

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References(26)

References

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An Impact Analysis of the Proportion of Adaptive Cruise Control Vehicles on the Safety of Mixed Traffic Flow at the Off-ramp Diverging Area

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