The answer options
- To allow brake lights to work
- To maintain engine power
- To stop draining the battery
- To prevent drivers behind being dazzledCorrect
Why that is the answer
Rear fog lights are exceptionally bright so that your vehicle can be seen in thick fog. Once visibility improves, these high-intensity lights will glare and dazzle drivers behind you. They can also mask your brake lights, making it difficult for following traffic to react when you slow down. The Highway Code states you must switch off your fog lights as soon as visibility improves.
How this comes up in the real test
Questions from vehicle handling appear throughout the 50-question multiple-choice section, and the wording changes between versions. Learn the rule rather than the sentence: the DVSA can ask the same point from the opposite direction, and a memorised answer falls over the moment the phrasing moves.
The pass mark is 43 out of 50, so seven wrong answers is your entire margin. If a whole category is shaky, run the topic practice below until you are getting every question right for the right reason, then go back to full mocks under the clock.
More vehicle handling questions
- A lot of snow has fallen recently. When driving in these conditions, what are some things to think about?
- After fog has cleared, it can be dangerous to leave your rear fog lights switched on. What is the reason for this?
- What colour are the reflective studs along the left-hand edge of the motorway?
- During the day, when should dipped headlight be used?
- How can you regulate your speed with the engine of your car?
- How should you deal with this hazard?