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Why is the period right after a summer thunderstorm begins especially slippery?
- A.Rain always improves grip instantly
- B.Summer rain contains no hazards
- C.The film forms only after an hour of rain
- D.Oil and dust on the hot pavement mix with the first rain to form a slick film before heavier rain washes it away
Correct answer
D. Oil and dust on the hot pavement mix with the first rain to form a slick film before heavier rain washes it away
Why
The most treacherous minutes are at the start of the shower, when water lifts accumulated oil into a lubricant layer. Reducing speed early, before the road looks fully wet, avoids the classic first-rain loss of traction.
Manual topic: Hot Weather - Rain · From the General Knowledge practice bank (GK-324).