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Streets and highways are most slippery:
A.  When it has been raining hard for several hours.
B.  When they are clean and dry.
C.  Just after it starts to rain.
Driving during the first half hour of rainfall is dangerous because roadways become extremely slippery when the water mixes with oil and other chemicals on the road surfaces that have not yet washed away. Use extra caution when driving on slippery roads.
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