Research On The Optimal Variable Messages Signs (VMS) Location Problem

With the development of the national society and economy, the urban traffic problem become increasingly serious, the advanced and efficient traffic guidance system has drawn attention globally, and variable message signs system is an important part of traffic guidance system. Currently, VMS is installed in the trunk road networks in China's main cities, and played a positive role in easing traffic jams. However, the decision of where to rightly install VMS on the trunk road networks was made on experiential judgment, rather than on rational, theoretic guidance. Thus the question of how to find the right position to install VMS so as to give full play to its guidance effect needs to be answered.This thesis is intended to study the VMS location based on the Beijing VMS case: First, the paper sums up the correlative literatures about the VMS and its location theory; then the traffic demand analysis and the value index is put forward, and the driver route choice behavior is analyzed. Secondly, the thesis introduces the simple and advanced incident delay model based on the deterministic queuing, then the thesis provides the VMS location model based on mathematical programming model and VMS benefit evaluation, and gives its arithmetic.Finally, the Beijing road network is chosen as the background of study, and the conclusion and the right installation position of VMS on it was figured out through dynamic traffic assignment theory, mathematical programming location model, the genetic algorithm and road network simulation.