When rain first starts
A free practice question for the California permit test, with the answer explained.
Independent practice site. We're not the DMV and aren't connected to any government agency.
When is a road often the most slippery?
The rule
Roads get very slick right when rain begins, most of all after a long dry, hot spell, because oil and dust haven't washed off yet. Slow down as soon as it starts.
The first rain after dry weather mixes with oil and dust on the road, making it very slick. Slow down as soon as it starts to rain.
From the California Driver Handbook, section 8, page 61. This question is our own wording of that rule. The handbook and the DMV have the final word.
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