Study on Traffic Organization around Pivotal Tunnel Entrance/Exit

With increasing pressure on above ground space and surface traffic, more and more cities choose to construct underground transportation junction to speed up traffic and improve travel efficiency. This paper covers survey and VISSIM simulation of vehicles at the entrance and exit of an in-progress tunnel at Zengjiayan, Chongqing. The results show: during construction of the pivotal tunnel, the entry of trucks to the construction area near the “left-in left-out” entrance and exit will significantly affect traffic on the artery where the tunnel is located; the flow line scheme under which trucks change lanes in advance at the entrance to the construction area is optimal. In addition to optimization of entrance and exit points, traffic organization around the tunnel during construction should be optimized to mitigate traffic pressure on the artery where the tunnel is located.