According to the accident analysis of vehicles in the curve, the skidding, rollover, and lateral drift of vehicles are determined as\nmeans to evaluate the lateral stability of vehicles. The utility truck of rear-wheel drive (RWD) is researched, which is high accident\nrate. Human-vehicle-road simulation models are established by CarSim. Through the orthogonal experiment method, the effects\nof different road geometries, speed, and interaction factors between road geometries on vehicle lateral stability are studied. In this\npaper, skidding risk of the vehicle is characterized by the Side-way Force Coefficient (SFC). Rollover risk of the vehicle is\ncharacterized by lateral acceleration and the load transfer ratio. Lateral drift risk of the vehicle is characterized by the sideslip angle\nof wheels. The results of orthogonal analysis reveal that the maximum tire-road friction coefficient and speed are highly significant\nin skidding of the vehicle. The effects of the combination of horizontal alignment and superelevation on vehicle skidding are\nimportant. The effects of horizontal alignment and speed on vehicle rollover risk are highly significant. The effects of superelevation\non vehicle rollover risk are significant. The effects of the interaction of horizontal alignment and superelevation are also\nimportant on vehiclesâ?? rollover risk. The speed and the maximum tire-road friction coefficient have highly significant effect on the\nvehicleâ??s lateral drift. The superelevation has a significant effect on the vehicleâ??s lateral drift. The effects of the interaction of\nhorizontal alignment and superelevation and longitudinal slope are also important on the lateral drift of the vehicle.
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