In heavy rainfall, at what speeds do most cars start to lose traction and hydroplane?

Most cars typically start to lose traction and hydroplane at speeds between 35 and 55 mph when driving on wet surfaces. At this range, the amount of water on the road can exceed the tire's ability to displace it, leading to a loss of direct contact with the road. This phenomenon occurs because the water creates a barrier between the tire and the road surface, reducing friction and control.

Driving at speeds higher than this can increase the likelihood of hydroplaning, especially in heavy rainfall or when there are puddles on the road. It is essential for drivers to be aware of this speed range so they can adjust their speed and maintain control of their vehicle during adverse weather conditions. Understanding this can help in making safer driving decisions in heavy rain.