South Carolina Driver's Permit Practice Exam

What is hydroplaning?

1. When a vehicle's engine fails

2. When a vehicle's tires ride on a layer of water built up between the road surface and tires

3. When tires are over-inflated

4. When brakes lock up on wet roads

The correct answer is: When a vehicle's tires ride on a layer of water built up between the road surface and tires

Hydroplaning occurs when a vehicle's tires encounter a layer of water on the road surface that is deeper than what the tires can displace. As a result, the tires lose their contact with the road and essentially float on the water, leading to a loss of traction and control. This phenomenon is particularly dangerous because it can cause the driver to lose the ability to steer or brake effectively, increasing the risk of an accident. When driving conditions are wet, especially during or after rain, it’s crucial to be aware of the possibility of hydroplaning. Drivers can minimize the risk by reducing speed, ensuring their tires are properly inflated and have adequate tread depth, and avoiding sudden movements with the steering wheel. Other options do not accurately describe hydroplaning. An engine failure doesn’t relate to tire function or water on the road, over-inflated tires can lead to different issues, and locked brakes can cause skidding but are not the same as hydroplaning.