Roadways are the most slippery:

When it hasn't rained in a long time.
When it has been raining for a long time.
When it starts raining.
When it stops raining.
Explanation

Roads become most slippery during the first minutes of rainfall. Oil, dust, and road debris mix with rainwater to create a hazardous slick surface that significantly reduces tire traction. This dangerous condition gradually improves as continuing rain washes away these substances. When encountering wet roads, slow down and increase your following distance to stay safe.

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