Highways are typically most slippery:
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During a heavy rainstorm in the middle of the summer.
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When they are heavily congested with traffic.
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After it has been raining for a long time.
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When it first starts to rain after a dry spell.
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Explanation
Rain can cause roads to become slippery, particularly after a dry spell. When it first starts to rain, the oil and dust on the road surface mixes with the water, causing the road to become slippery. This is why it’s important to slow down at the first sign of rain, especially after a dry spell.
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