Answer:visibility, traction, speed, distance
Explanation: Visibility is reduced when there are heavy rains or any other extreme weather conditions which means the driver will be unable to see clearly while driving on the road.
Which means they may not see what crosses in front of them or may not even be able to predict or see what's the other driver intends to do leading to collisions.
It may hinder their ability to react in time.
They have to slow down to the point where they even go below the actual average driving speed because the road becomes slippery which may mean the car may roll over if its heavy rains or they may even be things flying to the road.
They have to keep a double safe following distance , double than of the normal following distance since extreme weather conditions introduces so many different risks such as not be able to see a standing car on the road or the the crossing animals.
