What kind of road surface is indicated when the headlights change from far to near?

[StJaxson]

When driving, if the headlight illumination distance changes from far to near, it indicates that the vehicle is approaching an uphill slope, or is nearing the bottom of a downhill slope, or is approaching a curve. Additional information: 1. From near to far: When the headlight illumination distance changes from near to far, it indicates a sharp curve ahead, a large pothole, the vehicle reaching the top of a hill, or an upcoming steep downhill slope. 2. Moving from the center to the side of the road: When the headlights shift from the center to the side of the road, it indicates an upcoming curve in the opposite direction of the illuminated side. If the lights shift from one side of the road to the other, it means the vehicle is entering a series of curves. 3. Shadows appearing and disappearing: If shadows continuously appear on the road ahead and disappear as the vehicle approaches, it indicates shallow continuous depressions on the road. If the shadows do not disappear, there may be significant depressions or transverse ditches. 4. Dim light: If the headlights illuminate the road surface with dim light, it indicates an asphalt road. If the road appears bright and the light is clear, it indicates a gravel road.