The answer options
- To increase visibility in thick fogCorrect
- To increase visibility when driving at high speed
- To warn drivers to drop back
- To show when a car has broken down
Why that is the answer
Rear fog lights are extra bright lights designed to make your vehicle more visible to drivers behind you when visibility is severely reduced, such as in thick fog. According to the Highway Code, you must only use them when visibility drops below 100 metres. You shouldn't use them in normal conditions or to tell drivers to drop back, as the intense light can dazzle following drivers and obscure your brake lights.
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?