Question What happens when a vehicle hydroplanes? Answers The tires lose contact with the road. The tires have extra traction. The vehicle is easier to control. The vehicle becomes heavier. Explanation Hydroplaning occurs when a vehicle's tires lose contact with the road surface and instead glide along on a film of water above the surface of the road. This questions appears in the following tests: Illinois Class B Knowledge Test Maryland Class A Knowledge Test Maryland Class B Knowledge Test Massachusetts Class A Knowledge Test Massachusetts Class B Knowledge Test Massachusetts Passenger Minnesota Class B Knowledge Test