Question 4098
The rear fog light must be used in case of...
- dense clouds of smoke.
- nighttime frost.
- sudden braking.
Show answer and explanation
Correct answer: dense clouds of smoke.
Dense clouds of smoke are one of the situations in which the rear fog light is mandatory. So are dense fog, very heavy rain, and heavy snowfall. Frost or sudden braking does not reduce your visibility, so neither justifies using it. In the image, the car ahead is entering smoke from a fire with its rear fog light on.