Commercial Driver License (CDL) Class B Practice Test

What does hydroplaning refer to?

1. Tires losing contact with the road while wet

2. Tires skidding on dry pavement

3. Tires sliding down a hill

4. Tires maintaining traction on wet surfaces

The correct answer is: Tires losing contact with the road while wet

Hydroplaning refers specifically to the phenomenon where a vehicle's tires lose contact with the road due to the presence of a layer of water between the tires and the surface of the road. This occurs when water buildup on the pavement exceeds the tire's ability to displace it, leading to a situation where the tires are essentially gliding over the water rather than making direct contact with the road. This loss of traction can result in reduced control over the vehicle, making it critical for drivers to be aware of weather conditions and to adjust their driving accordingly. In contrast, other scenarios described do not align with the definition of hydroplaning. Skidding on dry pavement implies a loss of traction due to other factors, while sliding down a hill refers to a gravitational effect rather than the impact of water. Maintaining traction on wet surfaces is the opposite of hydroplaning, as it involves tires effectively gripping the road despite the moisture present. Understanding hydroplaning is essential for safe driving in rainy conditions, and recognizing the signs can help prevent accidents.