Research On Comprehensive Evaluation And Simulation Method For The Impact Of High-grade Highway Landscape On Driving Safety

With the development of High-grade Highway, more and more road accidents happened, which leads more people's attention. Transportation workers try to change the actuality of road traffic safety. they focus on the following fields: analyzing the cause of accident, evaluating the safety level of road, proposing the measure of improving driving safety. There are many factors which can leads road accident, some of them are studied separately, and a lot of measures are proposed; but there is few researchers focus on road landscape. For adapting the requirement of traffic safety technology, in this thesis we focus on the evaluation method for the impact of High-grade Highway landscape on driving safety.With the help of system engineering methodology, road safety and landscape of High-grade Highway are considered as a system, and this system is divided to two subsystem, they are line-level subsystem and point-level subsystem. Line-level subsystem is composed by the landscape and safety factors of the whole road; and point-level subsystem is someplace where there is potential danger of the landscape and driving safety.To evaluate a system, there must have perfect index system and reasonable evaluation method. In this thesis, the way to build the evaluation index system for road landscape impact driving safety is described; a new calculation method to calculate the value of evaluation factors, named fuzzy-entropy-weights method, is developed. Expert evaluation method is a useful qualitative evaluation method, and fuzzy consistent matrix method is a useful quantitative assessment method, full use of the advantages of these two methods, with the help of weighed arithmetic average method, a synthetic evaluation method is built.Comprehensive evaluation method which is established in this thesis can evaluate the integrated effect of landscape impacting the road traffic safety along the whole road. But if want to put forward the specific road traffic safety improvement measures, it must be do that evaluating the safety level of dangerous section/point. Identifying methods of the dangerous section/point are analyzed in the thesis.Through analyzing the dangerous section/point, we aware that sight distance model is the foundation theory and important tools for put forward the improvement measures. In this thesis, using sight distance theory of vehicle traveling, according the characteristic and geometry relationship of dangerous section/point, sight calculation model was built, which is about the road landscape impact on vehicle traveling.The value will be realized when the theoretical model is applied, and simulation method is a feasible and availability way to evaluate the effect of road landscape impact on the vehicle traveling. The following things are all described in this thesis, they are: foundation process of vehicle model, driver model, landscape model and road model, amending method of the model in simulation program, design method of flow of simulation procedure, compile process of simulation procedure. The sight calculation model was established in the former chapter, and it is used in the simulation procedure, which is compiled by Visual Basic, and realized the simulation and evaluation of landscape impact on the vehicle traveling.After detailed investigating"An-er"road of Jili province, analyzing the status of the landscape and road safety, built index system used to evaluate landscape impact on vehicle traveling safety; the whole road is divided to 12 parts using the road dividing technology which is built in this thesis, and was evaluated, the result showed that the rank of"An-er"road is"general". Choose four dangerous section/point which have extrude characteristic in"An-er"road, use the simulation procedure to simulate these four dangerous section/point, compared the simulation result and survey result, provide the measure to decrease the affect of road landscape to safety of"An-er"road.Landscape impact on driving safety is faintness, long-term; the comprehensive evaluation method established in this thesis, which is a combination of qualitative and quantitative evaluation methods, can overcome those problems. Simulation evaluation method can transfer a long-term impact to a relatively short time, and get the simulation results to realize the evaluation. Evaluation Method for the Impact of High-grade Highway landscape on driving safety established in this thesis can be as an important reference.