In short
Most failed tests come from a small handful of marked faults: junction observation, mirror checks before changing direction, hesitation at clear roundabouts, late or missed signals, and control under pressure. Each is a habit fix, not a knowledge gap.
Updated 2026-06-06 · 8 min read · By Driving Routes Editorial
The top 10
- Junction observation — failing to look both ways at minor crossroads.
- Mirror missed before lane change (the single most-marked fault).
- Hesitation at a clear roundabout.
- Late signal at a turn.
- Not checking blind spots before pulling away.
- Rolling stop at a 'stop' sign (US) or stop line (UK).
- Steering control under pressure (oversteering or jerky inputs).
- Incorrect lane position at junctions.
- Speed inappropriate to the road (too slow as much as too fast).
- Response to traffic signs and road markings (right of way confusion).
The habit fixes
Make MSM automatic. Say it out loud on every change of direction during practice. Drive the published routes at your centre at least twice — the second drive is when habits stick.
Frequently asked questions
What's the most common reason people fail the practical test?
Junction observation — failing to make effective use of mirrors and blind-spot checks before turning. DVSA stats consistently put it at #1.
What's the difference between a driving fault and a serious fault?
A driving fault is a minor error (you can have up to 15 and still pass). A serious fault is one that could be dangerous if it happened in real traffic — one is an automatic fail.