Study On The Accommodation Mechanism Of Vehicle Operating On Freeway Tunnel Entrance And Exit

As the two of the most common special structures in mountainous area, tunnels and bridges has the characteristics of high frequency of accident.However,when various special structures stay connected, this phenomenon will be particularly prominent.How to keep consistent with driver,vehicle and road environment as well as the vehicle can pass on the transition sectionor of tunnel entrance and exit with safe and meanwhile ensuring the comfort of driving and reliability of the traffic in dynamic environment is a worthy of study. In this paper, taking the tapic of the transition sectionor of freeway tunnel entrance and exit as the research object, research the accommodation mechanism of vehicle operating from many aspects.Firstly,this paper makes a detailed review on the the present research status at home and abroad, comparing and analysing shortcoming of the treatment mechanism of traffic safety transition sectionor of special structures with safety and puting forward the research ideas and framework of this paper experiment.Studying fundamentally on the basis of this, this peper puts forward the connotation of characterization of the accommodation mechanism,which mainly consists of three parts.Firstly,this paper spread out exposition for the driver,vehicle,road and enviroment, analysing the factors affecting the accommodation mechanism of vehicle operating on freeway tunnel entrance and exit. Secondly, through statistical analyses on the 128 tapic traffic accident at tunnel entrance and exit, safety property at tunnel entrance and exit is further studied.Thirdly, from the traffic stream characteristics point of view, the variation characteristics of traffic flow status and characterization parameter at tunnel entrance and exit is studied.At last, establish accommodation mechanism system from changes of physiological and psychological characteristics of drivers, consistency of traffic flow status, consistency of road infrastructure and consistency of characteristics of traffic safety.Next, uesing the method of combination of virtual and reality, provide experimental scheme of driving process at tunnel entrance and exit and collected data about the characteristic parameters of the driver’s physiological psychology during driving at tunnel entrance and exit, running speed and variation characteristics.Meanwhile, mining and analysising the experimental data at depth, basing on experimental data’s function mechanism is proposed. This part mainly includes three chapters. First of all, introduce design process and implementation process of the experimental scheme as a whole.Then, analyse the experimental data of driver’s eye movement characteristics at tunnel entrance and exit,and provide corresponding expression functions.Then,in order to analyse traffic stream characteristics about tunnel entrance and exit,on the basis of the existing research, establish simulation platform about tunnel entrance and exit based on VISSIM,built microcosmic model of traffic flow at tunnel entrance and exit. This part mainly includes four chapters. First,this part defined dividing limit about traffic flow is free or not during tunnel entrance and exit, established prediction model from alignment effecting correction, tunnel entrance and exit effecting speed and the brightness in tunnel entrance and exit effecting correction.Second, analysed tunnel entrance and exit’s following feature,and established the Car Following Modelling,moreover made a stability analysis. Third, established virtual simulation platform basing on VISSIM, calibrated parameter about the Car Following Modelling.Forth, on the basis of above research, analysed traffic stream characteristics about tunnel entrance and exit from macroscopic property.Finally, built evaluation system about the accommodation mechanism of vehicle operating on freeway tunnel entrance and exit, and basing on this,this part studied key technology about applicaction of accommodation mechanism as well as example verification was also carried out. This part mainly includes three chapters.First, built evaluation system from the accommodation mechanism of vehicle operating on freeway tunnel entrance and exit. Second,study and analyse key technology about applicaction of accommodation mechanism.It mainly include the study about consistency of horizontal and vertical alignments, cross-sectional transition technology, the optimization technology of lighting and traffic management and control facilities. Third,choosing the right project, the above research of key technology is tested and analyzed.