Roads become very slippery:
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When it's been raining for an hour or more.
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None of the other answers is correct.
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For the first 10 to 15 minutes of a rain storm.
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Right after the rain.
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Explanation
When it begins to rain after a period of dry weather, roads can become extremely slippery due to the oil and debris on the road surface mixing with the water. This phenomenon is particularly pronounced during the initial 10 to 15 minutes of a rainstorm. The rainwater causes the oil in the asphalt to rise to the surface, creating hazardous conditions for drivers.
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