Answer and explanation

Correct answer: D. Only when visibility is seriously reduced

  1. Step 1: Rear fog lights are bright. Step 2. Switch them off when visibility improves. Answer: Only when visibility is seriously reduced. Why not the others: Whenever it rains lightly: rear fog lights dazzle drivers behind when visibility is not seriously reduced. Whenever you drive at night: rear fog lights are too bright for ordinary night driving and dazzle drivers behind. Whenever you follow a heavy vehicle at night: the lights would dazzle the heavy vehicle's driver in the mirror.

Practise more Lights, level crossings and special roads.

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