When is the road surface often most slippery after a long dry spell?
Answer and explanation
Correct answer: D. In the first minutes of rain
- Step 1: Dry weather leaves oil and dust on the surface. Step 2. The first rain turns this film into a slippery layer until it is washed away. Answer: In the first minutes of rain. Why not the others: After the rain has fallen for several hours: long rain has washed the film off the road. Only when the temperature is above 30 degrees: temperature alone is not the cause. Only on motorways with a concrete surface: the film forms on all kinds of road surfaces.
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