Traffic Signal Control in Temporarily Oversaturated Networks

Abstract This paper considers a traffic signal control strategy for a temporarily oversaturated network. A space-time network control model is derived from the temporal disaggregation of the store-and-forward control by D’Ans and Gazis. By replacing the non-linear constraints which are caused by the turning movement ratios with flow conservation constraints, the model becomes a time-dependent multicommodity store-and-forward control model under a relaxed form of user optimum route choice. The model remains a linear programming problem which can be solved relatively easily. However, the possibility of having multiple solutions and violations of the FIFO principle in the space-time network is shown by example. The violation of the FIFO principle limits the application of the model to single commodity networks.