Question

class e general knowledge question #20 / 50
when it rains, the roads are most slippery
select a letter to choose your answer
a after several hours of light rain.
b just after the rain begins, because oil dropped from vehicles has not yet been washed away.
c just after the rain stops and the road is drying off.

Explanation:

When it rains, the roads are most slippery just after the rain begins. This is because oil dropped from vehicles has not yet been washed away. Oil and water form a mixture that reduces the friction between the tires and the road surface, making it more slippery. After several hours of light rain (Option A), the oil would have been washed away. Just after the rain stops and the road is drying off (Option C), the road is less slippery as the water is evaporating and the oil has already been washed away during the rain.

Answer:

B. Just after the rain begins, because oil dropped from vehicles has not yet been washed away.