Study On Layout Of Safety Facilities In Freeway Tunnels

In recent years, along with the rapid development of freeway, a large number oftunnels have been built, even in some complex terrain and dangerous mountain roadappeared an increasing number of the freeway tunnels. The tunnel and freeway tunnels arethe bottleneck section of the highway safety operation, the concomitant traffic securityproblems not only includes the traffic accident, emergency, vehicle safety performancetrouble hidden in vehicles, etc, but also as a road affiliated facilities, the problems of thesafety facilities comes out have attracted more and more traffic engineering scienceworkers’ attention.Starting from the analysis of traffic running environment, this paper mainly analyzesthe existing safety factors of traffic running environment in freeway tunnels section. On thebasis of unscrambling the national standards and specifications of the road safety facilitiesin design and setting up in detail, this paper finds out how the existing safety factors oftraffic environment to require and influence safety facilities’ design and setting up, So,which set up a foundation for the location of safety facilities.And then, with the comprehensively using and referencing thoughts and methods in thetraffic engineering, ergonomics and traffic psychology, also, referencing related nationalstandards and specifications, this paper puts forward the methods, which is traffic surveyand evaluation of coordination in speed, to the location of safety facilities. Then, themethods to location of traffic signs on tunnel entrance are derived. In order to control thespeed in freeway tunnels, the variable speed-limit scheme is adopted. Finally, using all sortsof analysis method comprehensively and orderly, through the qualitative analysis andquantitative calculation, the paper determined the "single tunnel-tunnels connecting freewaytunnels" as the main location line, and the facilities set configuration and setting matters.And also the paper finish the optimization of the safety facilities set, which provide thepractical significance reference to solve problems of the safety facilities’ location in specialstructure road and to ensure road function.Finally, in order to judge the performance for safety facilities and setting effect really and reasonably, the paper established3-level evaluation index system and determined thedistribution to evaluation index weight, then finished the Fuzzy Comprehensive Evaluation.