Partial hydroplaning of a typical passenger car can begin at speeds as low as

Explanation

Hydroplaning can occur where there is standing water on a roadway. Normally, the tires channel water away so they can maintain contact with the road. But at speeds of 50 mph and higher, a car's tires are no longer able to channel the water as well, and they will start to lose contact with the road and ride over the water like water skis.