Experimental Study On Influence Of Air Quality On Driving Safety In Long Highway Tunnel

As an important infrastructure in the transportation network,highway tunnel has the structural characteristics of large aspect ratio,limited space,diversified traffic flow structure and large traffic volume,leading to poor internal air quality,reduced visibility,affecting driving safety.At present,there are few studies on the influence of tunnel air quality on driving safety at home and abroad,among which the correlation study between tunnel air quality and visibility mainly adopts the field measurement method,which has problems such as unadjustable test parameters,poor universality and high cost.However,researches on the influence of visibility on driving safety mostly adopt qualitative methods or rely on the experience of managers,lacking scientific theoretical basis.Moreover,most of them equate visibility value with visual distance without considering the influence of background brightness and dynamic vision on visual distance.Therefore,this article adopts the method of combining theoretical analysis and experimental research,the analysis of highway tunnel air quality impact on road safety,to build the tunnel correlation model of visibility and air quality,and put forward different visibility conditions of tunnel safety level and safety control measures,in order to improve the level of tunnel traffic safety.The specific research contents are as follows:(1)Analyze the research status of tunnel air quality,tunnel visibility and the impact of visibility on driving safety,summarize the shortcomings of existing studies,and clarify the research methods and ideas of this paper.(2)Explain the related concepts of tunnel air quality,analyze the composition,nature and characteristics of tunnel air pollutants,as well as the impact on traffic safety,and make it clear that the reduced visibility caused by tunnel air pollutants is the main factor affecting traffic safety in tunnel.Based on this,the influencing factors and influencing mechanism of tunnel visibility were analyzed,and the quantitative relationship between visibility and driving visibility was established.(3)Develop feasible test Scheme,collect test data through indoor test and field test,use Origin software for statistical regression analysis of test data,build and verify the correlation model of highway tunnel air quality and visibility,and finally make a detailed analysis of the test error and its source.(4)Data related to tunnel visibility and driving speed were collected,and the standard deviation of driving speed was taken as the core index to propose tunnel safety levels under different visibility conditions.The speed limit model of tunnel low visibility was established,the speed limit standard and PM2.5 concentration control threshold under the condition of tunnel low visibility were proposed,and the control standard corresponding to tunnel safety classification was determined.(5)Taking The Shiziping tunnel of Wenma Expressway in Sichuan Province as an example,the air quality in the tunnel was detected on site,and the safety levels and driving safety control measures of each section of the tunnel were proposed according to the constructed model.In order to ensure the tunnel running safety and improve the transportation efficiency to the greatest extent,a traffic safety linkage system based on real-time tunnel air quality is proposed,and the control system operation program is written by using Matlab software.This paper aims at analyzing the influence of air quality on driving safety in long highway tunnel,and puts forward a method to measure driving safety level by using air quality of tunnel,so as to ensure driving safety in tunnel and reduce the occurrence of traffic accidents.