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In recent years, with the increasing demand of China's highway construction, the scale of the construction of the highway tunnel expanding long tunnel, highway construction in mountainous and hilly areas in the tunnel group also gradually become the focus of future development direction. Highway tunnel to tunnel, the tunnel group gradual increase of the number of tunnel sections traffic safety has brought new challenges, the tunnel the group sections accident rate high, to become one of the important factors in this stage affect highway traffic safety. Therefore, the highway tunnel accident occurred characteristics, occurrence regularity, speed limit problem become important core of this stage expressway tunnel group Traffic Safety Research, highway tunnel speed limits not only for highway management The department provides targeted security management measures can effectively reduce the social and personal property losses. In this thesis, relying on the National Natural Science Foundation project highway tunnel group traffic flow characteristics and security technology research \The definition of the base of the tunnel, the tunnel the group speed limit impact factors from the drivers, vehicles, roads, environment and driving behavior to select the angle of the impact of the speed limit for vehicles running from the rate-limiting conditions. Secondly, the speed limit section of the highway tunnel group, mainly from the distribution of traffic accidents and space running speed of the tunnel group to analyze the proposed the tunnel group speed limit control, the need to protect the safe operation of the vehicle, and on this basis carried out in-depth study on the motorway the tunnel group speed limit value and the rate-limiting methods, comparing the advantages and disadvantages of the various rate-limiting methods based on the analysis of complex operating environment of the tunnel group, proposed the establishment of a variable speed limit, and high-speed Highway Tunnels variable speed limit model, variable speed limit control system and control method, set the the tunnel group speed limit facilities study. Finally, the combination of microscopic traffic simulation software VISSIM for urban traffic, highway, highway tunnel group the actual data collection, for example, in the event of road congestion and traffic accident cases, use of variable speed limit control of the vehicle run simulation analysis method using variable speed limit on the highway tunnel group evaluate the effect of contrast with the actual situation.
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