Restrict Vehicle Turning Movements To Improve The Overall Performance Of Urban Transportation Networks

Turning restriction strategy has the potential to improve network performance. This paper investigates the turning restriction design problem that optimizes the turning restriction locations so as to maximize the improvement can be made.This paper discusses the process of modeling building of turning restriction. It first transforms a transportation network into a dual graph, where traffic turning movements can be explicitly modeled. Then a bi-level network design problem is proposed. The upper level aims to get the least travel time from the prospect of decision maker while the lower level applies the user equilibrium. The asymmetric user equilibrium is incorporated in the upper level model as a set of nonlinear constraints using variational inequality. A single-level mixed-integer nonlinear formulation is derived for the turning restriction design problem. The active-set algorithm is employed to solve the problem, by sequentially solving a relaxed turning restriction design problem and a design updating problem.Numerical examples performed on six-node network and Sioux Falls network demonstrate the proposed model and solution algorithm.