VISSIM Simulation Based Expressway Exit Control Modes

Abstract

In order to investigate the urban expressway off-ramp control problems, the traffic simulation software VISSIM was adopted. According to the traffic characteristics of the expressway off-ramp, the parameters of traffic model were determined. Furthermore, dichotomy and control variables were used to obtain the thresholds as vehicles start queuing in off-ramp, and comprehensive zoning map was made based on the traffic flow on the side roads and the main road. By selecting delay of main and side road as accessing indices, traffic control modes of the Shoushan entrance and exit of South Second Ring Expressway in Fuzhou were built. On account of the different stages of the comprehensive zoning map, the following simulation experiments are conducted: (1) priority of vehicles on the main roads, (2) simulation of induction control of off-ramp, (3) simulation of present situation. The optimal control method was determined according to the simulation results.