Common Driving Test Faults Explained (and How to Avoid Them)
The faults that fail driving tests are not random and they are not mysterious. The same handful of errors account for the large majority of fails, year after year, and almost all of them are about where you look and when rather than how skilfully you work the controls. Understand the common faults, recognise which ones you are prone to, and you can drill them out before test day.
This guide explains each major fault, exactly what triggers it, and how to make it disappear.
DriveRoutes is an independent app and is not affiliated with, endorsed by, or connected to the DVSA or DVLA.
How the fault system works
Before the specifics, you need the scoring, because it changes how you should think about mistakes.
The three fault grades, A minor (driving) fault is a small error with no danger. A serious fault is potentially dangerous, or a minor fault repeated enough to show a habit. A dangerous fault involves actual danger. You may collect up to 15 minors and still pass; 16 minors fails you, and any single serious or dangerous fault fails you outright.
Two things follow from this:
- The occasional small slip is fine. You have margin, 15 minors of it. Do not let one minor fault rattle you into making more.
- Repetition is the silent killer. A minor fault you make once is harmless; the same fault five times signals a habit, and habits get upgraded to serious. So your recurring weakness is far more dangerous than your one-off mistakes. Read more on minor faults, serious faults and dangerous faults.
Now, the faults themselves, in roughly the order they cost candidates their tests.
1. Junction observation
The number-one fail cause, every year. It means pulling out of, or turning at, a junction without looking properly, emerging when it is not safe, or not looking effectively enough to know it is safe.
What triggers it: rushing the emerge, looking but not really seeing, or looking only one way. Under nerves, candidates often glance without processing what they have seen.
How to drill it out: treat every junction as a deliberate routine, look right, look left, look right again, and only go when you have genuinely registered the gap. Practise effective observations until they are slow and certain rather than a panicked flick of the eyes. Busy crossroads are the classic test ground.
2. Mirrors, change of direction and speed
Second on the list: not using mirrors, or not acting on them, before changing direction or slowing down. The mirror check is not a tick-box; the examiner wants to see you use the information.
What triggers it: signalling or moving before checking, checking too late to actually respond, or forgetting the mirror entirely when slowing for a hazard.
How to drill it out: anchor mirrors to your MSM routine, Mirror, Signal, Manoeuvre, so the mirror always comes first, before the signal, before any change. Make it automatic on every change of speed and direction, not just turns.
3. Steering and positioning
This covers steering too early or late into turns, hitting or mounting the kerb, and poor road positioning, sitting too close to the centre line, or too far from it.
What triggers it: misjudging the turn-in point, over- or under-steering, and drifting out of position while distracted (often during independent driving when attention is split).
How to drill it out: practise smooth, well-timed steering and consistent positioning. For manoeuvres, lock in your reference points so steering is repeatable rather than guessed.
4. Moving off safely
Pulling away without proper observation, especially the blind-spot check, is a stubbornly common serious fault.
What triggers it: forgetting the blind spot check, moving off when it is not safe, or rolling back on a hill start.
How to drill it out: make a full observation, mirrors plus the blind spot on the side you are pulling out towards, a non-negotiable habit before every moving off. On hills, drill smooth clutch control until rolling back is a thing of the past.
5. Response to signs and signals
Misreading or ignoring traffic signs, road markings and traffic lights, and that includes not responding correctly to other road users' signals.
What triggers it: missing a sign because attention was elsewhere, hesitating at a green light, or not reading lane markings early enough at junctions.
How to drill it out: practise scanning well ahead so signs and signals register early. Strong anticipation, reading the road before you arrive at it, turns reactive scrambling into calm, planned responses.
6. Lane discipline and roundabouts
Being in the wrong lane, or wandering between lanes, particularly at roundabouts and on dual carriageways.
What triggers it: choosing the lane too late, missing the entry signal, or drifting on the roundabout itself.
How to drill it out: plan your lane before you arrive, signal correctly for your exit, and keep your road position steady through the roundabout. Mini-roundabouts and multi-lane roundabouts both reward early planning.
7. Making progress (and hesitation)
A fault people forget exists: being too cautious. Sitting at a clear junction, crawling well below a safe speed, or failing to take a reasonable gap are all faults, because they show you cannot drive confidently in real traffic.
What triggers it: nerves. Anxious candidates over-hesitate, waiting for a "perfect" gap that never comes.
How to drill it out: practise making confident, safe progress, taking reasonable gaps decisively and driving up to (not over) the limit where it is safe. This is especially important at rural and faster centres.
The pattern behind every fault
Step back and look at that list. Junction observation, mirrors, moving off, signs, lane discipline, they share a single root: where you look and when. Car control (steering, clutch) accounts for surprisingly few fails. The driving test is, overwhelmingly, an observation and anticipation test wearing a car-control costume.
That is liberating, because observation is learnable and drillable. You do not need racing-driver reflexes. You need to look early, look properly, and act on what you see.
How to find and fix your faults
The hard part is honesty: you cannot fix a fault you do not know you have. Three steps:
- Get specific feedback. Vague self-assessment ("that felt okay") hides repeating faults. You need someone, or something, pointing out exactly what you keep doing.
- Identify your one recurring weakness. Almost every learner has a signature fault: the mirror they skip, the junction they rush, the lane they pick late. Find yours.
- Drill that one thing. Targeted repetition on your weak spot is the highest-value practice there is, because it stops a repeated minor from becoming a serious fault.
This is precisely what DriveRoutes is built to do. It maps the documented routes at your test centre so you practise the real junctions and roundabouts where these faults happen, and its AI co-pilot debriefs each drive, turning "I think that went fine" into a specific list of the faults you keep making and the ones you have fixed. Knowing your pattern is most of the battle.
The bottom line
The faults that fail driving tests are predictable, repetitive and almost entirely about observation. You have margin for the occasional minor slip, what fails people is the habit that repeats or the one genuinely unsafe act. Learn the common faults, find your personal weak spot, drill it on your real test routes, and you remove the very things that fail most candidates. The test rewards drivers who look early, look properly, and act on what they see, and that is something anyone can practise into a habit.
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