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417. Which of the following is the most correct explanation of a frozen or icy road in winter?
- It occurs mainly in tunnels, and the road surface becomes an icy road as the fog particles freeze.
- Black ice often occurs on bridges, at tunnel entrances, and on shady roads.
- Black ice occurs when snow contaminated with vehicle fumes accumulates on the road surface.
- When passing through an icy road, reduce the speed as much as possible by not operating the steering wheel and braking suddenly.
Answer : 2