Longitudinal Acceleration Characteristics of Vehicles on Sharp Turns Section in Low Grade Highways of Mountainous Areas

In order to clarify the longitudinal acceleration characteristics of the vehicle in the sharp bend section of the low-grade highway in the mountainous area, the section of the national Road G211 from Huadiwan to Dashuzi village was taken as the research object, and the real vehicle continuous driving test with a mileage of 9.7 km was carried out. The continuous data of longitudinal acceleration were collected, and the main distribution range of acceleration peak and deceleration valley in the curve and the mean characteristics of longitudinal acceleration and deceleration were analyzed. The correlation between average acceleration and acceleration length and the correlation between average deceleration and deceleration length were analyzed. The results show that the main distribution ranges of longitudinal acceleration peak and deceleration valley in the uphill direction are 0.8~2.0 m/s² and -1.6 ~ -0.2 m/s², respectively. In the downhill direction, the main distribution ranges are 0.4~1.2 m/s² and -3 ~ -1.8 m/s², respectively. The peak value of longitudinal acceleration and the valley value of deceleration are mainly distributed at the transition curve. The average acceleration and acceleration length and the average deceleration absolute value are negatively correlated with the deceleration length. The research results of this paper can provide reference for the design of road safety facilities and traffic safety evaluation.