Connected autonomous vehicles (CAVs) can supplement the information from their own sensors with information from surrounding CAVs for decision making and control. This has the potential to improve traffic efficiency. CAVs face additional challenges in their driving, however, when they interact with human-driven vehicles (HDVs) in mixed-traffic environments due to the uncertainty in human's driving behavior e.g. larger reaction times, perception errors, etc. While a lot of research has investigated the impact of CAVs on traffic safety and efficiency at different penetration rates, all have assumed either perfect communication or very simple scenarios with imperfect communication. In practice, the presence of communication delays and packet losses means that CAVs might receive only partial information from surrounding vehicles, and this can have detrimental effects on their performance. This paper investigates the impact of CAVs on traffic efficiency in realistic communication and road network scenarios (i.e. imperfect communication and large-scale road network). We analyze the effect of unreliable communication links on CAVs operation in mixed traffic with various penetration rates and evaluate traffic performance in congested traffic scenarios on a large-scale road network (the M50 motorway, in Ireland). Results show that CAVs can significantly improve traffic efficiency in congested traffic scenarios at high penetration rates. The scale of the improvement depends on communication reliability, with a packet drop rate of 70% leading to an increase in traffic congestion by 28.7% and 11.88% at 40% and 70% penetration rates respectively compared to perfect communication.
翻译:连接的自动车辆(CAVs)可以通过周围的CAVs信息来补充来自其自身传感器的信息,从而补充来自其自身传感器的信息,从而做出决策和控制。这有可能提高交通效率。但是,在混合交通环境中,当与人驱动车辆(HDVs)互动时,CAV在驾驶行为方面的不确定性,例如反应时间较大、感知错误等,在混合交通中,CAVs对交通安全和效率的影响存在不确定性时,CAVs(CAVs)会面临更多的挑战。 虽然许多研究已经调查了CAVs对不同渗透率的交通安全和效率的影响,但所有研究都假设了通信通信的完美通信或通信不完善的非常简单的情况。 实际上,通信延迟和包装损失意味着CAVs可能只从周围的车辆获得部分信息,这可能会对其性能产生有害影响。本文调查了CAVS在现实通信和公路网络情景(即通信不完善和大型公路网)中通信联系率不可靠对混合交通业务的影响。我们分析了40个交通状况下的交通状况,对大型公路网络(M50车况段的交通效率分别取决于CAVs 70-revus的下降速度率的下降率。