Study On Speed Limit Of Vehicles On Freeway Tunnel Group

In recent years, as increasing demand for freeway construction of China, freeway tunnel construction scale has been expanded. long freeway tunnel and the tunnel group construction in the mountainous and hilly areas is becoming the focus of future development direction. The increase of Long freeway tunnel and tunnel group bring new challenge for the road traffic safety. High accident rate of freeway tunnel group is becoming one of the important factors in affecting freeway traffic safety. The reach of freeway tunnel accident characteristics, occurrence, speed limit becomes the important core in traffic safety research of freeway tunnel group at this stage. The speed limit reach on freeway tunnel group not only provid safety management measures for the freeway management department, but also reduce the social and personal property losses.This paper relies on National Science Foundation project《The reach of traffic flow characteristics of freeway tunnel group and Safety Technology》, collected a large number of observed data in tunnel sections, also refer to the large number of domestic and international research-related results. Firstly, giving the definition of freeway tunnel group from the drivers visual characteristic scope. Analyze speed limiting factors of freeway tunnel group from the drivers, vehicles, roads and environment. Reach the effects of speed limit in driving behavier point of view.Secondly, analyze the speed limit section of freeway tunnel group. Analyze from the tunnel traffic accident distribution and speed aspects and propose the necessary of speed limiting in freeway tunnel group to ensure the safe operation of vehicles. On this basis, carried out depth research on the value of speed limit and speed limit methods of freeway tunnel group. Comparative advantages and disadvantages of various methods of speed limit. Propose establishing Variable speed limit method relies on complex operating environment of tunnel group. Variable Speed Limits and freeway tunnels model, variable speed control system and control method, tunnel group speed facilities are studied.Finally, using freeway tunnel group collection data and urban traffic, freeway traffic simulation software Vissim to simulate the effect of vehicle operation in road congestion and traffic accidents condition with variable speed limit.Compare with the actual situation and evaluate the effect of the freeway tunnel group method using variable speed limit.