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

Because tyre grip improves when wet.
Because wheels rotate at a greater speed after rain.
Because wheels rotate at a slower speed after rain.
Because the required stopping distances is greater.

Explantion: On a wet road surface, your tyres do not grip the road surface as well as in dry conditions and your required stopping distance is increased. Because of that you should slow down during or after 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