Research on Optimization Model of Signal Control at Short-Length Intersections Considering Queuing Constraints

In urban road networks, when the distance between adjacent intersections is short, and the traffic demand is relatively high, there will be a spillover of queued vehicles from the downstream intersection to the upstream, which would affect its normal function. In this paper, the signal control strategies of two short-length intersections are optimized considering queuing constraints and collaborative benefits. First, the cycle length and offset optimization models are proposed considering the queuing constraints of adjacent intersections. Then, microscopic traffic simulation software is applied to verify the model proposed in this paper. The results show that the optimization model proposed in this paper has a better effect on average delay, queue length, and stop times without spillover. Besides, it shows better compatibility in near-saturation states. In conclusion, the model proposed in this paper has practical significance for improving the operational efficiency of short-length intersections and mitigating traffic congestion.