Three main factors contribute to hydroplaning, or the loss of traction on wet roads:

• Vehicle speed: As speed increases, wet traction is considerably reduced.
• Water depth: The deeper the water, the sooner you will  lose traction, although even thin water layers can cause a loss of traction, even at low speeds.
• Tire tread depth: As your tires become worn, their ability to resist hydroplaning is reduced.

Since hydroplaning can result in a complete loss of traction and vehicle control, you should always reduce speed with consideration to the traffic around you.

This post courtesy of Toyo Tires