Which road surface is considered the most slippery?

Wet (melting) ice is considered the most slippery road surface primarily due to its texture and the presence of water on the surface. When ice is melting, it creates a thin layer of water over the ice, which significantly reduces traction for vehicles. This condition can lead to loss of control as tires have difficulty gripping the surface.

In comparison, wet concrete may be slick, but it does not pose the same level of risk as melting ice because it typically maintains some traction. Dry asphalt offers ample grip and is much less hazardous. Snow-covered roads can also be slippery, but they usually provide at least some traction depending on the depth and density of the snow, while wet ice presents a far higher risk for skidding and accidents.