Research On The Layout Of Traffic Safety Facilities In Urban Tunnel Based On Traffic Efficiency

Traffic is growing and road congestion is becoming more and more serious.The construction of urban tunnel can not only share the pressure of other main roads,but also shorten the travel distance.However,the environment of urban tunnel is different from ordinary roads,and it is necessary to strengthen the normativeness of driving for drivers.According to the nature of the urban tunnel,it belongs to the urban expressway,and can not ignore the efficiency of the road in order to pursue the safety.Therefore,based on the safety of traffic safety facilities,his paper puts forward the influence of different arrangements of traffic safety facilities on the traffic efficiency,so as to realize the arrangement mode of the safety facilities combined with the traffic efficiency.This paper,taking the traffic safety facilities in the entrance and exit of the city tunnel as well as the inside of the tunnel as the research object,the main contents include following aspects:First of all,the urban tunnel traffic flow is different from the highway tunnel and the urban road,and the specific travel environment is analyzed.Due to the different influence conditions of the road,this paper summarizes the verification methods of tunnel traffic efficiency,including speed,flow rate,vehicle speed dispersion and vehicle speed deviation,are obtained.Secondly,the evaluation of traffic safety facilities system is carried out.The fuzzy comprehensive evaluation method of AHP is adopted,the evaluation index and the calculation weight are selected,and the safety performance of the existing traffic safety facilities is evaluated as a whole.Thirdly,on the basis of specifications,the layout of guardrail,traffic signs,traffic marking,sight guidance facilities,anti-glare facilities and other traffic safety facilities are studied.The arrangement of traffic safety facilities is related to road alignment,driver's angle of view and road conditions.With the help of VISSIM,field investigation and experiment as well as literature review,the influence of different traffic safety facilities on road traffic efficiency is obtained,and the layout mode of maximizing traffic efficiency is obtained.Finally,combined with Xuanwu Lake Tunnel,the area of traffic safety facilities,vehicle speed and flow rate are investigated.Without changing the road,the arrangement mode of traffic efficiency is put forward,and the driving simulator is used to test its safety and traffic efficiency.As a result,both safety and traffic efficiency have been improved.