What is a concern immediately after it begins raining? Question What is a concern immediately after it begins raining? Answers The water will mix with grease and oil on the road, making the roadway slippery. A driver may forget where the windshield wiper lever is located. It may stop raining. People will be using their windshield wipers needlessly. Explanation 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. This questions appears in the following tests: Arkansas Class B Knowledge Test District Of Columbia Tank Massachusetts Class B Knowledge Test Nebraska Double North Dakota Class A Knowledge Test