|Table of Contents|

Lane-changing decision model of connected and automated vehicles driving off ramp(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2023年05期
Page:
242-252
Research Field:
交通信息工程及控制
Publishing date:
2023-11-10

Info

Title:
Lane-changing decision model of connected and automated vehicles driving off ramp
Author(s):
HAO Wei;  ZHANG Zhao-lei;  WU Qi-yu;  YI Ke-fu
(Hunan Key Laboratory of Smart Roadway and Cooperative Vehicle-Infrastructure Systems, Changsha University of Science and Technology, Changsha 410114, Hunan, China)
Keywords:
CAV;  lane-changing decision model;  cost function;  mixed traffic flow;  numerical simulation;  CAV penetration rate
PACS:
U491.2
DOI:
10.19818/j.cnki.1671-1637.2023.05.017
Abstract:
A safety risk-based lane-changing decision model of connected and automated vehicles(CAVs)driving off the ramp in mixed traffic flow was proposed to macroscopically characterize the behaviors of CAVs driving off the ramp in the CAV lane. The model abstracted the lane-changing gap selection process into Bernoulli experiments of successful or unsuccessful lane-changing, and a lane-changing success rate formula was set up based on the traffic flow theory. A driving off ramp lane-changing decision cost function considering lane-changing safety and efficiency was proposed, in which the weight parameters of safety and efficiency were determined based on different driving modes, so as to determined the optimal lane-changing intention generation point for CAVs and provided instructions for CAV lane-changing. Numerical analysis results show that the success rate of CAV driving off the ramp is determined by the preparation distance of lane-changing, traffic demand, and CAV penetration rate. The cost function has an obvious inflection point with the change of CAV penetration rate. When the traffic volume is 2 400 veh?h-1, the optimal lane-changing intention generation point for CAVs is 1 km away from the entrance of the off-ramp. When the traffic volume increases to 4 000 veh?h-1, the optimal lane-changing intention generation point is 2.5 km away from the entrance of the off-ramp. When the traffic volume is greater than 6 400 veh?h-1, the CAV needs to increase aggressiveness to drive off the highway efficiently. The cost function first decreases and then increases as the CAV penetration rate increases. If the penetration rate is lower than the inflection point penetration rate, the cost function can be reduced by increasing the preparation distance of lane-changing. If the penetration rate is higher than the inflection point penetration rate, reducing the preparation distance of lane-changing is necessary to reduce the cost function. Simulated results show that the traffic safety of driving off the ramp significantly influenced by the traffic demand and CAV penetration rate. The time-to-collision reduces to 76.23%,with the penetration rate increasing from 30% to 60%. 2 tabs, 8 figs, 31 refs.

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Last Update: 2023-11-10