The 10 most failed UK theory test questions (2026)
Some questions trip up learners far more than others, usually because the answer feels like common sense but isn't, or because the numbers are easy to mix up. Here are ten that catch people out most, with the correct answer and the reason it's missed.
1. Stopping distance at 70 mph
The overall stopping distance at 70 mph is 96 metres (about 315 feet, or 24 car lengths). People underestimate it badly. Remember it grows much faster than speed: doubling your speed roughly quadruples the braking distance.
2. The penalty for using a handheld phone while driving
It is 6 penalty points and a £200 fine. Many learners still answer £100 or 3 points (the old penalty). Pass your test in the first two years and 6 points means you lose your licence.
3. A flashing amber light at a pelican crossing
It means give way to any pedestrians still on the crossing. If the crossing is clear, you may go. People wrongly treat it like a normal amber and stop dead, or drive on while someone is still crossing.
4. A red X above a motorway lane
You must not drive in that lane. It usually marks an incident or closed lane ahead. Move into an open lane in good time. Ignoring a red X is an offence, not advice.
5. When you can use the hard shoulder
On a normal motorway, only in an emergency. On a smart motorway the hard shoulder may be opened as a running lane, but only when the overhead signs say so. Never assume it is yours to use.
6. Who gives way at a mini-roundabout
Give way to traffic coming from your right, the same as a normal roundabout. The small size makes people hesitate or push on when they shouldn't.
7. The national speed limit on a single carriageway
For a car it is 60 mph, not 70. The 70 mph limit applies to dual carriageways and motorways. The national speed limit sign (white circle with a black diagonal line) does not mean "no limit".
8. Minimum legal tyre tread depth
1.6 mm, across the central three-quarters of the tyre and around the whole circumference. Learners often guess 1 mm or 2 mm.
9. The first thing to do at the scene of a crash
Warn other traffic and make the area safe (hazard lights, a warning triangle if you have one), then call the emergency services. Do not move a casualty unless they are in immediate danger.
10. Following distance in the wet
Use the two-second rule in the dry, and at least double it (four seconds) in the wet. In ice it can be ten times longer. People remember the two-second rule but forget it changes with the weather.
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