A dry concrete road provides the best friction to the drivers, and they have the best traction and need less room to stop.
A dry concrete road provides the best friction because of the smooth surface which helps in better grip and friction. in the case of a dirt road, the friction will be least because the loose gravel, icy or snowy roads will be slippery which will reduce the friction. Concrete tends to be less slippery than asphalt in the rain and light snow. Ice forms more slowly on a gravel road than on asphalt or concrete. Dry sand reduces traction and can cause the vehicle to slide or skid. Wet leaves and water on the road surface can severely reduce traction.
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