One of the most common questions learners ask is: "what would automatically fail me?" The answer is more nuanced than most people expect — there's no fixed list of specific actions that always fail you, because context matters. What matters is the category of fault.
Here's a clear breakdown of how the fault system works, what causes instant failures, and the specific situations Dan Stagg sees most often in lessons across Crawley and Horsham.
How driving test faults are categorised
The DVSA practical driving test assesses your driving using three levels of fault:
- Dangerous fault — an action that causes actual danger to you, the examiner, another road user, or a pedestrian. Automatic fail. The test ends at the earliest safe opportunity.
- Serious fault — a potentially dangerous action that didn't cause immediate danger but demonstrated unsafe driving. Automatic fail.
- Minor fault (driver fault) — a less significant error. You can accumulate up to 15 minor faults and still pass. 16 or more is an automatic fail. Repeated minor faults of the same type can also be treated as a serious fault.
So technically, there's no list of actions that always result in an instant fail — what matters is whether the examiner classifies the action as dangerous or serious. That classification depends on the severity and context of the error.
If a dangerous situation occurs during the test, the examiner may use the dual controls or instruct you to stop. The test is not automatically terminated at the moment of the fault — it continues to the nearest safe stopping point. The fail is recorded on your test report.
Actions that almost always result in a serious or dangerous fault
While context always plays a role, the following actions almost always result in a fail because of the level of risk they create:
Running a red light
Driving through a red traffic light is a dangerous fault in virtually all circumstances. It creates the risk of a collision with crossing traffic, which the examiner cannot control. This is one of the clearest instant fails on the test.
Pulling out in front of oncoming traffic
Emerging from a junction without adequate observation — particularly where oncoming traffic has to brake or swerve — is a dangerous fault. This is also the most common reason learners fail their test nationally, according to DVSA data. Read more in our article on the most common driving test fails.
Exceeding the speed limit
Driving above the posted speed limit during the test is a serious fault. Significantly exceeding it — such as reaching 40mph in a 30 zone — is typically a dangerous fault. The examiner will record this immediately.
Dangerous positioning on the road
This includes drifting onto the wrong side of the road (particularly on bends or around parked cars), cutting corners on right turns, or positioning in a way that forces oncoming traffic to take evasive action.
Ignoring a stop sign
A stop sign requires you to come to a complete stop at the line — not a rolling slow. Failing to stop fully at a stop sign is a serious fault. Emerging without stopping when traffic is present is a dangerous fault.
Entering a box junction when the exit is blocked
Yellow box junctions must not be entered unless your exit is clear (or you're turning right and only blocked by oncoming traffic). Entering when the exit is blocked is a serious fault.
Not stopping at a pedestrian crossing
Failing to stop for a pedestrian on a zebra crossing, or moving before a green man appears and pedestrians have cleared a controlled crossing, is a serious or dangerous fault depending on the risk created.
Causing the examiner to intervene
If the examiner uses the dual controls, gives a verbal instruction to avoid an accident, or physically intervenes, this records a dangerous fault. The test continues to a safe stopping point, then ends.
Dangerous manoeuvre execution
During reversing manoeuvres, serious and dangerous faults can occur if you mount the kerb heavily, collide with another vehicle, or create a hazard for road users by moving without adequate observation. A light touch of the kerb is typically a minor fault — see our separate article on whether hitting the kerb is an instant fail.
Situations that are more nuanced
Stalling
A single stall, handled calmly and safely (handbrake on, restart, move off with full observation), is usually a minor fault. Stalling repeatedly — especially in the same situation — accumulates to a serious fault. Stalling in a dangerous location, such as a level crossing or a busy junction, could be recorded as dangerous.
Mounting the kerb
Light kerb contact during a manoeuvre is usually minor. A heavier contact — especially one that jolts the car, creates a risk to pedestrians, or occurs while driving (not manoeuvring) — is serious or dangerous.
Hesitation and undue hesitation
Excessive hesitation at junctions — waiting so long that you disrupt traffic flow, or repeatedly refusing to emerge when it's clearly safe — is recorded as a serious fault. It's not "caution" in this context; it's a failure to make a correct and timely decision.
What happens if you get an instant fail?
The examiner will continue with the test to the nearest safe stopping point — they don't pull over immediately at the moment of the fault. When you return to the test centre, they'll show you the DL25 test report marking the fault, explain what happened, and confirm that you haven't passed.
You can rebook a new test immediately. The waiting time for a new test slot at Crawley varies — check the DVSA booking portal for current availability.
"In 18 years, I've seen pupils get instant fails for all sorts of reasons — but almost all of them were preventable with more preparation on the specific roads. When pupils are properly prepared for the junctions and roundabouts on the Crawley test route, the dangerous and serious faults simply don't appear."
How to avoid serious and dangerous faults
The underlying cause of most dangerous faults is the same: the learner encounters a situation they haven't practised enough to handle confidently. The solution is straightforward — more deliberate practice on the right roads, with an instructor who knows the test routes.
At Stagg Motoring School, Dan specifically designs lessons to include the junctions, roundabouts, and road types that appear on the Crawley test routes. By the time a pupil books their test, there should be no situation they haven't already driven multiple times.
If you're learning in Crawley, see our Crawley driving lessons page for details on how Dan structures route-specific preparation. For Horsham learners, the Horsham driving lessons page covers the same approach for your area.
Frequently asked questions
What is an instant fail on a driving test?
Any dangerous or serious fault results in a fail. A dangerous fault involves actual risk to people; a serious fault is a potentially dangerous action. Either type means you don't pass, regardless of how well the rest of the test goes.
Can you fail for stalling?
A single stall handled safely is usually a minor fault. Multiple stalls, or a stall in a dangerous location, can become serious. Stay calm — how you deal with the stall matters as much as the stall itself.
Does the test end immediately when you get a serious fault?
No — the test continues to the nearest safe stopping point. The examiner won't immediately announce the fault; you'll find out when you return to the test centre and they go through your result sheet.
Can you fail for going too slowly?
Yes. Undue hesitation at junctions or driving significantly below the speed limit when conditions don't require it can result in a serious fault. Safe driving means appropriate speed — not just staying below the limit.
