Streets and highways are most slippery:
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When they have just been cleaned.
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When it finally starts to rain after a long period of dry weather.
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When the weather is humid.
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When it has been raining for several hours.
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Explanation
Roads are most slippery just after it starts to rain, especially after a long dry spell, because the rain can mix with oil and debris that have accumulated on the road, making it particularly slippery at the onset of rainfall. When the road is slippery, drive more slowly than you would on a dry road. Wet road conditions increase your braking and stopping distance, so be sure to drive carefully and increase your following distance.
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