After a heavy downpour, why should a driver keep a greater distance from the vehicle in front?

Because required stopping distances are decreased.
Because wheels rotate at a greater speed after rain.
Because wheels rotate at a slower speed after rain.
Because wheel-spray may impair visibility.

Explantion: Heavy rain can affect how well you can see and how well you can be seen by other road users. Because of that you should slow down in heavy rain and keep a greater distance from the vehicle in front.

Theory Tester

After a heavy downpour, why should a driver keep a greater distance from the vehicle in front?

Managing Risk