Author: Fan, Tingting
Title: V2X-assisted integrated lane-changing and variable speed limit control for weaving segments
Advisors: Ho, Ivan (EIE)
Degree: M.Sc.
Year: 2022
Subject: Traffic engineering
Traffic flow
Hong Kong Polytechnic University -- Dissertations
Department: Department of Electronic and Information Engineering
Pages: 87 pages : color illustrations
Language: English
Abstract: With the rapid growth of traffic demand, the weaving concentration problem is significant on the highway, resulting in decreased operation efficiency and road safety. The cooperative intelligence transportation system (C-ITS) with vehicle-to-everything (V2X) technology provided the possibility for emerging new cooperative strategies to alleviate that problem. In this research, two traffic control strategies are proposed and investigated along with the integrated strategy of the two control methods. One is the longitude lane-changing (LC) distribution strategy, which is verified in a real V2X simulation environment by sending LC advisory messages to connected vehicles (CV) via a roadside unit (RSU) and tested under different packet loss rate scenarios. The other one is the variable speed limit (VSL) control strategy based on the deep deterministic policy gradient (DDPG) algorithm of reinforcement learning (RL).
In terms of simulation platform, a joint-simulator-based digital twin platform is applied for verification of the proposed algorithm, in which traffic simulator SUMO models traffic network and vehicular mobility, and network simulator OMNeT++ establishes a V2X communication environment.
The results indicate that LC control alleviates the concentration area at around 50 m to 150 m by distributing LC behaviors more evenly. When the packet loss rate is lower than 0.2, LC advisory control brings a positive effect on the traffic performance, but it reduces the road efficiency when the packet loss is higher than 0.4. On the other hand, the RL-based VSL control algorithm has limited effect on mitigating the concentrated LC behaviors, but it can improve the overall traffic efficiency in terms of average speed and travel time. In comparison, the integrated strategy has the most effective impact on alleviating LC concentration as well as improving vehicle mobility performance. In addition, the RL-based VSL control can compensate for the impact of serious packet loss on LC control to a certain extent, which can effectively improve the traffic efficiency especially under poor communication situations.
Rights: All rights reserved
Access: restricted access

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