Most test failures aren’t dramatic. They’re small, repeated slips — the same kind of thing going wrong two or three times in ways that add up. Understanding how faults are actually scored helps you know what to focus on.

How faults are scored

Examiners mark every mistake into one of three categories:

  • Minor fault — a small error that isn’t dangerous on its own. You can have up to 15 of these across the test and still pass.
  • Serious fault — a mistake that could have caused actual danger. One of these is an automatic fail.
  • Dangerous fault — an error that caused real danger to you, the examiner, or someone else. Also an automatic fail, and treated more seriously than a serious fault.

A test isn’t failed by one bad moment in isolation as much as by a genuinely unsafe action — the categories exist precisely to separate “not perfect” from “not safe.”

The faults that come up most often

Year after year, DVSA’s own published statistics point to the same handful of categories:

  • Junctions — observation. Not looking properly before emerging, especially at give-way junctions where visibility is poor. The single most common reason for failure.
  • Mirrors — not checking, or not acting on what you see. Before signalling, changing direction, or slowing down.
  • Roundabouts. Wrong lane choice, poor observation on approach, or hesitating so long you cause following traffic to react.
  • Control during reverse manoeuvres. Not the manoeuvre itself so much as steering too late, or not observing all around while doing it.
  • Response to signs and road markings. Missing a sign, or reacting to one too late to act on it safely.

How to actually reduce these

  • Slow down at junctions you don’t know well. Most observation faults happen because a driver is going slightly too fast to properly check before committing.
  • Make mirror checks a physical habit, not a mental one — an actual head or eye movement the examiner can see, not just “I looked.”
  • Don’t rush roundabouts. A brief, controlled hesitation to get the lane and gap right costs nothing; a wrong lane change mid-roundabout is exactly the kind of thing that becomes a serious fault.
  • Practise manoeuvres until the steering timing is automatic, so you can spend your attention on observation instead.
  • Drive the actual roads near your test centre before test day. A lot of these faults cluster around junctions and roundabouts a driver has simply never seen before — familiarity fixes more of this than extra manoeuvre practice does.

Browse practice routes near your test centre to get used to the roads before you’re doing it for real.