What Is Hydroplaning?
Hydroplaning occurs when a layer of water builds up between your tires and the road surface, causing your tires to lose contact with the road. When this happens, you lose the ability to steer, brake, or accelerate effectively. It can happen at speeds as low as 35 mph.
When Does Hydroplaning Happen?
Hydroplaning is most likely during the first 10 to 15 minutes of a rainstorm, when oil and water mix on the road surface. It is also more likely at higher speeds, with worn tires, and on roads with standing water.
How to Prevent Hydroplaning
Keep your tires properly inflated and replace them when the tread is worn. The penny test is a quick way to check: insert a penny into the tread with Lincoln's head facing down. If you can see all of Lincoln's head, your tires need replacing. Slow down during rain, especially in the first few minutes. Avoid puddles and standing water when possible. Do not use cruise control in wet conditions.
What to Do If You Hydroplane
Stay calm. Do not slam the brakes or turn the wheel sharply. Ease off the gas pedal and let the car slow down naturally. Keep the steering wheel straight or gently steer in the direction you want to go. Once you feel the tires regain traction, you can gently brake and resume normal driving.
DMV Test Questions
Hydroplaning is a common topic on the DMV written test. Key facts to remember: hydroplaning can happen at 35 mph or more, worn tires increase the risk, do not brake suddenly if you hydroplane, and the first few minutes of rain are the most dangerous.