Calculating the Lengths of Auxiliary Lane and its Channelization of Urban Expressway Exit Using Simulation

The rational lengths of auxiliary lane and its channelization of urban expressway exit play an important role in increasing the exit capacity and decrease the influence to expressway traffic flow from exit. The entrance-exit style exit of diamond interchange was surveyed, and traffic flow data was collected. VISSIM microcosmic simulation model was calibrated and validated using survey data, and the exit of diamond interchange simulation model was built. Using simulation, the authors analyzed the survey data and worked out the recommendation values of auxiliary lane and its channelization length of urban expressway exits.