Research on Design Index for Continuous Uphill Gentle Slope of Expressway in Mountainous Area

Abstract On the basis of analyzing the measured data of the uphill slope and establishing the relationship model between the decrease of truck operation speed and the traffic accident rate, put forward admissible speed reduction standard. According to the distribution of truck load truckload tonnage and power weight power-weight ratio, select the researching dominant vehicle comprehensively. The design index of uphill gentle slope is obtained based on recovering the operation speed of trucks and considering the climbing performance curve of the leading vehicle on the uphill gentle slope section. The research results can provide a reference for the design of uphill gentle slope of expressway in mountainous area.