Study on the Design of Variable Lane Demarcation in Urban Tunnels

In order to alleviate the influence of low-speed vehicles on tunnel safety, this paper discusses setting method variable lane boundaries in urban tunnels. VISSIM simulation software is used analyze traffic flow when changes are allowed and prohibited. The results show that average speed tunnels greatest, can be significantly alleviated dividing line. When 40 km/h set, delay time reduced by 30–50%. existence increased local lane, lower vehicle greater road volume, longer time. volume 1200 pcu/h, density right-hand decreases 43.5% after set. While changing prohibited, presence causes a backlog rear which leads significant increase density. Setting lane-changing permits impact flow. research provide scientific basis for operation management