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Question:

If you are driving in heavy rain, you must slow down to avoid

A hydroplaning.
Explaination

On a wet road, at speeds of up to 35 mph, modern tires will usually channel water away to maintain contact with the road. However, in deep water at higher speeds, the channeling action of the tires becomes less effective and the tires start to ride on a layer of water like water skis. This is called “hydroplaning.” It may result in a loss of braking and steering control. To prevent hydroplaning, slow down.