After fog has cleared, it can be dangerous to leave your rear fog lights switched on. What is the reason for this?

This will overload the electrics

Direction indicators may not work

After fog has clea… — They may be confused wi…

The answer options

This will overload the electrics
The bulbs could fail
Direction indicators may not work
They may be confused with brake lightsCorrect

Why the other options are wrong

“This will overload the electrics” is a distractor. It does not meet the standard the question is testing, which they may be confused with brake lights does. Picking it in the real test costs a mark you cannot get back, and with a pass mark of 43 out of 50 you only have seven to spare.
“The bulbs could fail” is a distractor. It does not meet the standard the question is testing, which they may be confused with brake lights does. Picking it in the real test costs a mark you cannot get back, and with a pass mark of 43 out of 50 you only have seven to spare.
“Direction indicators may not work” is a distractor. It does not meet the standard the question is testing, which they may be confused with brake lights does. Picking it in the real test costs a mark you cannot get back, and with a pass mark of 43 out of 50 you only have seven to spare.

Why that is the answer

Rear fog lights are high-intensity red lights designed to make your vehicle visible in thick fog. If you leave them on when visibility improves, they can dazzle drivers behind you and be easily confused with your brake lights. This makes it harder for following traffic to notice when you actually brake. Leaving fog lights on will not overload your electrics, but the Highway Code states you must turn them off when visibility improves.

What vehicle handling covers

· Front and rear fog lights and the 100-metre visibility rule
· Descending steep hills in a lower gear and engine braking
· Traffic calming, humps, and driving over tram rails
· Night driving, dipped headlights and dazzle from oncoming traffic

Mistakes learners repeat on this topic

· Leaving rear fog lights on after visibility improves
· Coasting downhill in neutral to save fuel
· Using full beam on a lit motorway or behind another vehicle
· Accelerating between speed humps instead of holding a steady speed

Instructor tip: Any question with fog in it usually turns on the 100-metre rule — check visibility before you check the 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.

Practise Vehicle Handling Sit a full mock test