Research On Longitudinal Slope Of Forest Road Based On Driver's Psychological And Physiological Reflection

With the constant improvement of our highway grade and the rapid development of automobile industry, considering driving safety , people have paid more and more attention to driving comfort. The traditional highway alignment design takes vehicle driving theory as a basis, it only considers the slope climbing capability, braking performance and handling stability of cars, does not take account for users'perceptions. The user of a road is the people driving; the quality of highway alignment design can directly affect drivers, and then influence the driving safety and comfort. Therefore, it is very important to consider the highway line design from the driver's psychological and physiological reaction in order to relieving the driving fatigue, reducing the traffic accidents and improving the using quality of road.This paper takes forest road as the study object, and takes a large quantity of experimental data as basis, it makes change rate of heart rate as the index of the study on driver's physiological and psychological reflection in forest region by analyzing the relationship between driving tensity and the change of heart rate. It sets up heart rate regression models based on partial correlation analysis, and analyzes the relationship between driver's psychological tensity and slope grade, slope length, driving speed under different conditions. The verification showed that these models could reflect the actual situations of driver's heart rate change in forest region.The initial experiment showed that the driver who was driving downslope was tenser than driving upslope, and the psychological burden of which was driving under heavy load is bigger than driving under no load.It was found by partial correlation analysis that both slope grade and driving speed will affect the change of heart rate when the driver was driving upslope and downslope, and the slopegrade has more influence on heart rate than driving speed. The steeper a slope is ,and the faster a speed is, the tenser a driver become, the easilier a traffic accident happen. In addition, the slope length will affect driver's heart rate when he was driving upslope, but it has less influence than slopegrade and driving speed. Furthermore, only slopegrade and driving speed affect driver's psychology when the driver was driving upslope and downslope under heavy load. The steeper a slope is ,and the faster a speed is, the tenser a driver become, the bigger a driver's driving fatigue is. Different from driving under no load, the driving speed has more influence on driver's heart rate than slopegrade.