Hydroplaning occurs when a layer of water builds up between your tires and the road faster than the tire can disperse it — causing the tire to lose contact with pavement and the driver to lose steering and braking control. It can happen suddenly even at moderate speeds.
Hydroplaning (also called aquaplaning) is a phenomenon where a tire rides on top of a film of water rather than maintaining contact with the road surface. When this happens, the tire's tread grooves are overwhelmed by water and cannot evacuate it fast enough to maintain grip. The result is a sudden, dramatic loss of vehicle control — the steering feels vague, the car may want to drift, and braking is severely compromised.
Three main factors contribute: vehicle speed (higher speed = less time for water to be displaced), water depth on the road surface (standing water or heavy rain increases risk), and tire tread depth (worn tires have fewer and shallower grooves to channel water away). Tire inflation also plays a role — underinflated tires deform in ways that reduce their water-evacuation efficiency.
Reduce speed in wet conditions — this is the single most effective countermeasure. Maintain adequate tread depth; the tread is specifically designed to evacuate water from under the contact patch. Keep tires properly inflated. Avoid puddles, standing water, and wheel ruts where water accumulates. Drive in the tracks of the vehicle ahead — they have already displaced some of the water.
If you feel your car begin to hydroplane: ease off the accelerator gradually — do not brake suddenly or make sharp steering inputs. Maintain a straight course if possible. Allow the vehicle to slow naturally until tires regain contact with the road. If the car begins to rotate, steer gently in the direction of the skid to prevent a spin.
