Road Traffic Safety Comprehensive Evaluation And Simulation Of Urban And Rural Ecotone Of Central Cities

The problem of road traffic safety is one of the major issues of present and futureof human society is facing. With China's rapid economic development, urban andrural transportation are more active and road traffic safety has become an increasinglyprominent. The scale of the central city expansion, the level of urbanization increased,driven by urban and rural economic development, production and living demand inrecent years the rapid growth of traffic traveling, urban and rural ecotone trafficvolume dramatically in particular. The urban and rural ecotone road to connect thetransition sections of the city roads and highways, both the characteristics of urbanroads and highways, even the same sections of different traffic environment. Urbanand rural ecotone road conditions and traffic management lags behind the trafficdemand, resulting in the kind of road traffic accidents frequent, especially seriousaccidents growth trend.The differentiated traffic environment and dual characters of urban and ruralecotone with road traffic safety problems become more complex. More studies ofdomestic and foreign researchers on the road of urban traffic safety and highwaytraffic safety, but less on the road of urban and rural ecotone.In this dissertation the central cities of urban and rural ecotone road traffic safety,according to road conditions, the characteristics of the different behavior of the driverin this section of road traffic, through means of test and simulation, to master thevehicles acceleration and speed characteristics interlaced with roads in urban and ruralecotone, and investigate the traffic safety impact of the urban and rural ecotone keyfactors in its mechanism of action, build road conditions of road safety evaluationindex system, through constructing vehicle acceleration interference model andvelocity fluctuation model, studying the relationship between acceleration interferenceand speed discrete, research for the scientific evaluation of the central cities urban andrural ecotone road traffic safety to provide theoretical support, and prevention and toreduce the road traffic accidents is of positive significance.The main content of this dissertation include the following aspects.Firstly, to explain the background and significance of this dissertation, domesticand foreign traffic safety, traffic accidents, traffic problems of urban and rural ecotoneof research program and the main results achieved were reviewed, to ensure the goal of the dissertation and the main content and the technology roadmap for research.Secondly, from the drivers, vehicles, road conditions and environmental aspects,to conduct a comprehensive analysis of road safety elements of the urban and ruralecotone, combined with the existing theoretical research and survey, discusses theurban and rural ecotone traffic safety features, and to lay the foundation for furtherresearch.Thirdly, according to urban and rural ecotone road features, the use of qualitativeanalysis and quantitative analysis of the method of combining, road conditions, roadinfrastructure, road traffic management, access port, the intersection of five indexes toestablish two layers traffic safety evaluation index system, comprehensive applicationof the Delphi method, network-level method and entropy method, to gain the roadsafety indexes of the total weight limit by super matrix. The road of urban and ruralecotone in Harbin as an example, for evaluating the safety of the road and verifythem.Fourth, the use of fiber gyroscope experiment, choice of vehicles three-directionacceleration interference as the evaluation of road safety indexes. Based on theconcept of acceleration interference, to construct different road linear accelerationinterference model and three-direction acceleration interference model, selected urbanand rural ecotone typical segments, measured at different segments of the vehicleparameters, to gain experimental results and verify the acceleration model.Fifth, using of traffic simulation software on road speed, vehicle flow, trafficdensity, and based on the simulation results for speed discrete and road traffic safetyanalysis. Using of velocity fluctuation coefficient, to build the models to analyze therelationship between velocity fluctuation and the safety. To make use of gray relationentropy method to model, and determining the various vehicle types with speeddiscreteness relationship.