Streets and highways are most slippery:
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While it is raining.
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When it's been raining for one hour or more.
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Just after it starts to rain.
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On the day before it starts to rain.
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Explanation
Streets and highways are most slippery just after it starts to rain because the mixture of oil, dirt, and water creates a slippery film on the road. This reduces traction, making it challenging to maintain control on curves and increases stopping distance. To stay safe, slow down to adjust to these conditions.
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