What is a concern immediately after it begins raining?

Question

Under wet conditions, roads are often most slippery when it first begins to rain. This is because the water mixes with oil and grease on the road that has not yet begun to wash away.

Accepted Answer

The water will mix with grease and oil on the road, making the roadway slippery.

Answer

A driver may forget where the windshield wiper lever is located.

Answer

It may stop raining.

Answer

People will be using their windshield wipers needlessly.