当车灯光投射距离由远变近时,提示汽车驶近或驶入上坡道。当车灯光投射距离由近变远时,提示汽车已在下坡道或由陡坡进入缓坡。当车灯光离开路面时,提示前面出现急弯或车辆已驶至坡顶。当车灯光由路中移向路侧时,提示前方出现一般性弯道。当车灯光从道路的一侧移到另一侧时,提示前方为连续转弯道。当对向车射出光线较短时,表明来车将接近坡道;当对向车射出的光线与路基脱离 When the lights projected distance from far to near, suggesting that the car approaching or into the ramp. When the lights projected from the near far distance, suggesting that the car has been downhill or steep slope into the gentle slope. When the car lights left the road, suggesting a sharp bend in front or the vehicle has been driven to the top of the hill. When the lights move from the road to the roadside, suggesting a general corner in front of. When the lights from one side of the road to move to the other side, suggesting a continuous turn in front of the road. When the opposite car emits light is short, it means that the car will be close to the ramp; when the car and the light emitted from the roadbed off