A Continuous Road Network Planning Model Based on Robustness Objectives

The continuous network design problem refers to optimizing the performance of the whole system by increasing the capacity of existing links. In this study, a continuous road network planning model is established considering robustness. This model is a bi-level programming model. The upper level model is a multi-objective model within limited fund. When the system is disturbed, the goals of the upper level model are to minimize the generalized cost changes for all users and maximize the whole efficiency of the road network. The lower level model is an improved Beckmann user equilibrium assignment model, which takes into account the variation of the actual link capacity caused by emergencies. A simple road network is selected to verify the valid of the proposed model.