Abstract
Traffic congestion on highways is a social issue that requires immediate resolution as it is a cause of economic loss, environmental problems, as well as traffic accidents. The objective of this research is to help resolve the issue of traffic congestion using connected vehicle and automated driving technologies, which have continued to make remarkable progress in recent years. This paper proposes a lane change control system and an optimization-based control algorithm running on a cloud server to rectify traffic flows. The effects of these proposals on reducing congestion at the Kashima interchange merging zone on the Hanshin Expressway was investigated using a traffic simulation with actual traffic data. This paper also studies the effects of communication delays between vehicles and the cloud server.