Roads are the most slippery:
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When it's been raining for 30 minutes or more.
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After it rains.
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When it first starts to rain.
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All of the above.
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Explanation
When rain first begins to fall, it mixes with oil, dirt, and debris on the road, creating a slick surface. This reduces the friction between your tires and the road, making it more slippery. As a result, your vehicle may lose traction, increasing the risk of skidding or hydroplaning.
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Other questions in the same category: Safe Driving on Slippery Roads
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