Final answer:
In a heavy rain, tires can lose all traction with the road at about 50 mph, a phenomenon called hydroplaning.
Step-by-step explanation:
In a heavy rain, your tires can lose all traction with the road at about 50 mph. This is called hydroplaning. Hydroplaning occurs when a layer of water builds up between the road and the tires, preventing the tires from making direct contact with the road surface. This reduces friction and makes it difficult to steer or brake effectively.