When is the pavement most slippery?

When it's been raining from at least one hour.
If it's been raining several hours.
When it has just begun to rain.
Explanation

Many road pavements are the most slippery when it first starts to rain because the oil dropped from passing vehicles has not been washed away. At the first sign of rain, drizzle, or snow on the road, you should slow down, use extra caution, and increase your following distance.

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