VMS effectiveness under influence of time control

To establish the best induction time model of variable message signs (VMS), and based on the optimum system theory, this paper uses a stated preference(SP) survey method to collect the VMS valid data of the road section and adds the time control theory to the use of VMS in order to solve the congestion caused by the overreaction of information. Finally, the paper simulates road network situations in three conditions: the non-VMS induction, the VMS induction without time control, and the VMS induction with the time control. In the contrastive analysis of the three kinds of situations, using AIMSUN is to simulate the situation with time control and without time control. The result indicates that the use of the VMS reduces the traffic jam; the effective time control may greatly enhance induction validity of VMS, especially under the serious traffic accident conditions; the time to get the traffic on the move again for VMS induction with time control is reduced by nearly half compared to the VMS induction without time control. This conclusion may provide reference for the traffic management bureau´s routine work.