Philadelphia Drivers License Practice Test

What is hydroplaning?

1. Loss of control due to excessive speed

2. The buildup of water under the tires

3. Skidding due to sudden braking

4. A condition caused by driving on icy roads

The correct answer is: The buildup of water under the tires

Hydroplaning refers to the phenomenon that occurs when a layer of water builds up beneath the tires of a vehicle, causing the tires to lose contact with the road surface. This loss of traction means that the driver can no longer effectively steer or brake the vehicle, which can lead to a significant loss of control. Hydroplaning typically occurs at higher speeds when driving on wet roads, especially if there is standing water. When water accumulates on the road and the vehicle's speed generates enough pressure underneath the tires, the water cannot be displaces quickly enough, resulting in a thin film of water that essentially allows the vehicle to "float" on the surface rather than grip the road. This is why understanding and recognizing the dangers of hydroplaning is crucial for safe driving in wet conditions. Other options describe different driving issues. Loss of control due to excessive speed does not specifically denote the conditions of water and tire interaction. Skidding due to sudden braking involves losing traction from abrupt input rather than water build-up. Lastly, driving on icy roads might cause skidding or loss of control, but it does not relate to the specific conditions of hydroplaning.