Jack Williams

What is 'Hydroplaning?'

It has nothing to do with those pontoon-equipped aircraft that can take off on water-those are seaplanes-but hydroplaning is something you need to be aware of when you're at the wheel and raindrops start hitting your windshield.

The main function of the tread pattern on typical vehicle tires is to provide escape routes for any water that gets stuck under your wheels as you drive.

In heavy rain or flooding conditions, though, your tires' treads may not be able to force all that water away from your car. The treads become flooded, and water starts to accumulate in a layer between the tire and the road surface. Once the tire loses contact with the road, the wheel is no longer helping you control your car. It's sitting atop a sheet of water, like a water ski. This is hydroplaning. Depending upon which wheels are hydroplaning, you could lose control of your vehicle.

Hydroplaning can happen at speeds as low as 35 mph. The safest way to avoid hydroplaning is to reduce your speed when there's a lot of water on the road surface.

If you start to hydroplane, take your foot off the gas pedal. Turn your wheel in the direction of the skid and keep your eyes pointed in the direction where you want the car to go. If your car has antilock brakes, apply the brakes. You will feel them pulsate as the braking system tries to regain the tires' grip on the road. If you don't have antilock brakes, do not apply the brakes. You'll only make it harder to regain control of your car.