The answer options
- Wear a hi-vis jacket
- Reduce tyre pressures
- Allow plenty of timeCorrect
- Have a caffeinated drink
Why the other options are wrong
- “Wear a hi-vis jacket” is a distractor. It does not meet the standard the question is testing, which allow plenty of time 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.
- “Reduce tyre pressures” is a distractor. It does not meet the standard the question is testing, which allow plenty of time 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.
- “Have a caffeinated drink” is a distractor. It does not meet the standard the question is testing, which allow plenty of time 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
The Highway Code advises allowing plenty of time for your journey in foggy weather. Poor visibility forces you to drive much slower to maintain a safe distance from the vehicle in front, so rushing dramatically increases your risk of a crash. You must never reduce your tyre pressures, as this compromises vehicle handling and grip. Wearing hi-vis clothing or drinking caffeine will not make driving in fog any safer.
What safety margins covers
- · Thinking, braking and overall stopping distances at each speed
- · The two-second rule and when to extend it
- · Skid causes, anti-lock braking and how to steer out of a skid
- · Driving in rain, fog, ice, snow and strong crosswinds
Mistakes learners repeat on this topic
- · Quoting the braking distance when asked for the overall stopping distance
- · Using the two-second rule unchanged in the wet instead of doubling it
- · Believing ABS shortens the stopping distance on loose or icy surfaces
- · Steering against the skid rather than into it
Instructor tip: Learn 20mph = 12m and add 6m per 10mph of thinking plus a growing braking figure — the pattern is easier than the raw table.
How this comes up in the real test
Questions from safety margins 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 safety margins questions
- What circumstances will cause an increase in your total stopping distance?
- As you approach a right-hand bend, you should keep well to the left. Why is this?
- How can the engine of your car be used as a brake?
- How can you avoid wheelspin when you’re driving on an icy road?
- How can you tell if your vehicle's tyres are losing their grip on a wet road surface?
- How should you make sure your brakes are working properly after passing through floodwater?