6. Highways are most slippery: (Select one)
a. During a heavy rainstorm
b. During a light rain
c. Just when it starts to rain after a dry spell
The theory behind this question is that, after an extended dry spell, you will have oil build up in the porous surface of the roadway which will immediately be brought to the surface and make the road very slippery.
The rain will gradually wash this away.
95%... didn't read the pedestrian question closely enough.
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