基于三维线形的轻型高速公路纵断面指标研究

man-vehicle-road coupling system was builded based on Carsim/Trucksim to explore the key parameters of light expressway route profile design. According to the operation characteristics of light vehicles in the profile and curve slope combination sections, the control vehicle type of light expressway and the gradient and slope length parameters of route profile were determined. The results show that light trucks and minivans should be used as the control vehicles for the longitudinal design parameters of light highways. When driving at high speed, the speed attenuation of vehicles in the curve slope combination section is more severe than that in the single longitudinal slope section. According to the characteristics of speed attenuation and allowable speed reduction, when the design speed of the light expressway is 100km/h, the light truck with the specific power of 25W/kg should be used as the control vehicle when allowing small trucks to pass. The maximum longitudinal slope of the route profile is 5%, and the maximum slope length is 750m. If small trucks are not allowed to pass, the maximum longitudinal slope of the route profile is 6%, and the maximum slope length may not be limited. When the design speed is 120km/h and 140km/h, the van with the specific power of 35W/kg shall be used as the control vehicle. The maximum longitudinal slope of the route profile is 6% and 5% respectively, and the corresponding maximum slope length is 1200m.