What is the minimum depth of water that can cause hydroplaning?

• A. 1/4 Inch
• B. 1/10 Inch
• C. 1/2 Inch
• D. 1 Inch

Answer: (B)

Hydroplaning happens when a layer of water builds between the tire and the road, so the tire can’t grip the surface and starts to ride on top of the water. Under typical driving conditions, this can begin with only a very shallow layer of water—about a tenth of an inch. That means at common speeds on wet roads, even light rain can create enough film for the tire to lose contact, especially if the tires are worn or not properly inflated. The risk grows as water depth increases or as speed rises, and good tread depth and correct tire pressure help channel water away and reduce that risk. To stay safer in rain, slow down, maintain your tires, and if you do start to hydroplane, ease off the accelerator and steer gently to regain traction.