Streets and highways are most slippery:

On the day before it starts to rain.
Just after it starts to rain.
While it is raining.
When it's been raining for one hour or more.
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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