Research On Traffic Safety Of Highway Bridge-tunnel Group In Mountainous Areas

Highways with Bridge-Tunnel group located in the mountainous areas are featured bythe complex traffic environment, which have three different structural types: bridges, roads,and tunnels and belong to the sections where the road environment changes sharply, and theyare the main space distributed spots of traffic accidents. The accidents happened inBridge-Tunnel group always lead to high causalities. Nowadays, the safety research mainlyfocus on the single bridge, single tunnel, and entirety of the group of tunnels of highways.However, the research is not enough when it comes to the comprehensive analysis of thecombination of these three aspects as the counter-influenced subjects. Moreover, because thelack of relative statistics of the accidents, most researchers always qualitatively study theimportance of safety driving in groups of bridges and tunnels sections in highways andmanagement measures, and the mechanism of the accidents is not fully analyzed. The trafficaccidents in Bridge-Tunnel group in highways located in the mountainous areas are thecoupling results of complex catastrophes factors in the driving process. The traditional causetheories of normal traffic accidents cannot be applied to explain the accidents, which occur inBridge-Tunnel group. As a result, the research on the key problems of the safety mechanismof driving in the group Bridge-Tunnel group in highways located in mountain areas, thebehaviors of drivers, the safety status of vehicles, and the strategy of traffic safety control, isimportant to enhance the traffic safety of the Bridge-Tunnel group in highways located inmountain areas, effectively decrease the amount of traffic accidents, and create safe andharmonious roads traffic environment.In order to study mountainous highway bridge-tunnel group safety mechanism deeply, inthis paper, the connotation of bridge-tunnel and driving safety is defined, and bridge-tunnelgroup driving system operation mechanism and characteristics of dissipative structure areanalyzed, and the security mechanism of highway bridge-tunnel mountain group drivingsystem is proposed, using the theory of entropy and dissipative structure, safety entropy indexsystem and system entropy model are established, and the entropy value calculating method isgiven. At last, the bridge-tunnel group of the expressway from liuan to wuhan is taken as anexample to verify the model and calculating method. The results show that, maintenance of the dissipative structure in bridge-tunnel group system is the foundation of traffic safety, andthe entropy theory and dissipative structure can effectively explain the occurrence mechanismof mountain highway tunnel group of traffic accidents. When|B|>1+A2, the bridge-tunnelgroup system is dissipative structure, which in safe state. When|B|<1+A2, the bridge-tunnelgroup system is dissipative structure, which in dangerous state.The research on behaviors of drivers is the fundamental and basic parts of the drivingsafety research of the Bridge-Tunnel group in mountain areas. Mentality screen is animportant method to keep the standard to become a bus driver. Vision, perception, andjudgment are three important stages for drivers in the practical driving process. Any loss ofanyone of these three may result in traffic accidents. The characteristics of psychologybehaviors of drivers are analyzed, and the mentality screen standard for bus drivers who drivevehicles in Bridge-Tunnel group in mountains areas is set up, by using Delphi Method. themethod of percentiles is used to ensure the range of normal value of different indexes by thetests for1400bus drivers,. Then, case-contrast method is used to verify whether the normalvalue and its judgment method of psychology indexes of bus drivers in Bridge-Tunnel groupin mountain areas are suitable, by field testing of152safe and accident causing drivers. Atlast, driving suit testing equipment is adopted to test and analyze the physiology andpsychology characteristics of drivers who drive in Bridge-Tunnel group in mountain areas. Byspot testing, effect of features of vision, sense and reaction on the driving safety inBridge-Tunnel group in mountain groups is studied, and the correlation of influencing factorsis analyzed.Directing to the brittleness of the driving system of the Bridge-Tunnel group in mountainareas, adaptive Agent graph theory is applied to the research of driving safety status of theBridge-Tunnel group in mountain areas. Firstly, the connotation of safety status of cars in theBridge-Tunnel group in mountain areas is defined, and its influential factors are analyzed.“Wuxing Theory” is adopted to describe the evolution progress of safety status of cars inBridge-Tunnel group in mountain areas, and the relationship between the safety entropies ofdriving system in Bridge-Tunnel group and its brittle behavior is analyzed. The adaptiveAgent graph of brittle behaviors of driving system of Bridge-Tunnel group is established. Atlast, rear-end collision accident in Bridge-Tunnel group is set as an example to simulate the brittle behavior of driving system of Bridge-Tunnel group in order to verify the reasonabilityand feasibility of adaptive Agent graph. The simulating results show that the collapse of keypoint will cause the collapse of the whole system in short time, the initial values of the state ofall points determine that the collapse of the whole system, and the collapse of the wholesystem has retardance.In order to improve the operation quality of Bridge-Tunnel group in mountainous areas,the effectiveness of setting traffic signs at the existence of Bridge-Tunnel group in mountainareas and the conditions of passing information are analyzed by studying the features oftraffic of Bridge-Tunnel group. The effective setting module of traffic signs at the existence isestablished. The existing problems of the setting of deceleration vibration lines inBridge-Tunnel group in mountain areas are analyzed. Using the ergonomics and traffic flowtheory, the condition which can be used by drivers to pass information by effectively usingdeceleration vibration lines is analyzed. By making advantage of the relationship between thevelocity of vehicles and the comfort and the features of visions of drivers, the theory moduleof the safety distance between existences and entrances of Bridge-Tunnel group in mountainareas and deceleration vibration line is established. The influencing factors and thedetermining methods of limiting speed in Bridge-Tunnel group are analyzed, and the speedlimit values of Bridge-Tunnel group in mountain areas by TOPSIS calculation is determined.