Applicability Simulation Analysis of Left-in and Left-out Stereo-compound Expressway
The parallel high-speed operation of the stereo-compound expressway is performed through the stereo-level and the ground-level,which has a left-in and left-out layout due to terrain,corridor,and structural constraints.In order to study the applicability of left-in and left-out,this paper adopts the VISSIM micro simulation analysis method,uses the travel time,delay time and queue length of vehicles passing through the on-ramp connecting section as evaluation indexes,compares the traffic performance of different combinations of service levels,ramp merging ratio and vehicle composition,and put forward the composition of vehicles and the ramp merging ratio that left-in and left-out can replace the right-in connection mode under the restricted conditions.The results show that:1)Under the conditions permitted,the right-side connection should be adopted as far as possible;2)Under limited conditions,the optimal passenger-cargo ratio and on-ramp inflow ratio of left-in should be 9 ∶ 1 and 1 ∶ 1 respectively,the optimal passenger-cargo ratio and on-ramp inflow ratio for the left-out should be 8 ∶ 2 and 3 ∶ 7 respectively.
stereo-compound expresswayconnectionsleft-in and left-outapplicability
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