Safety Evaluation Research Of Freeway Research On Horizontal Alignment Design And Safety Based On Drivers' Workload

In the current day, road alignment design of our country is based on the standard of vehicle dynamics and the engineering technical consideration. Sometimes it cannot meet the physical and psychology needs of the drivers and significantly reduce the level of road safety. In this paper, some classic theories such as cognitive psychology, physiological psychology, behavior, engineering psychology, were used to analyze the physiology and psychology change influenced by the variations of road alignment. The safety of alignment indexes of freeway longitudinal slope was studied considering the drivers'workload.This paper is based on the cognitive process of drivers driving on the road and related research on degree of drivers'workload. The actual driving test is tried on the road outside and detailed analysis which is the traffic safety factor in the constituent elements of horizontal curve sections on degree of drivers'workload is complied. The correlation between degree of drivers'workload and road traffic conditions was studied. And the representative value of this study is selected accordingly. Through qualitative and quantitative analysis, the traffic safety factors of horizontal curve are proposed. The models of both car and truck drivers'workload on horizontal curve ware established. According to drivers'subjective evaluation, integrating variations of drivers'workload from analysis of experimental data and the relational model established for cars and trucks, propose recommended values of horizontal curve radius for cars and trucks. Through analysis of accident data of test sections, Obtain results that accidents of horizontal curve sections occurred in the sections of designed very small horizontal curve radius, which verified the conclusions of this research better.