Taking your practical driving test can feel nerve-wracking, but understanding exactly what examiners are watching for is the best way to clear those pre-test jitters.
During your 40-minute driving test, you are allowed up to 15 minor driving faults (minors). However, making just one serious or dangerous fault results in an automatic fail.
To help you get test-ready, we’ve broken down 3 of the most common instant-fail mistakes learners make—and how you can avoid them to pass with flying colours!
1. Forgetting Your Mirrors Before Signalling
One of the most frequent serious faults recorded by DVSA examiners is incorrect mirror usage before signalling or changing speed.
The Mistake: Indicating first and checking your mirrors second (or skipping mirror checks entirely).
Why It’s a Serious Fault: Signalling without checking your surroundings can mislead or startle other road users—especially cyclists or drivers in your blind spot who might already be overtaking you.
How to Fix It: Always stick strictly to the MSM Routine (Mirrors → Signal → Manoeuvre). Every time you plan to signal, turn, or change speed, check your interior mirror and relevant side mirror first.
2. Rolling Through a STOP Sign
A STOP sign is not the same as a Give Way junction, yet many learners treat them identically.
The Mistake: Keeping the car moving slowly at a STOP sign because the road looks completely clear.
Why It’s a Serious Fault: By law, a STOP sign requires your vehicle to come to a complete standstill behind the stop line. Rolling past without stopping is a direct traffic violation and an instant serious fault.
How to Fix It: Bring your wheels to a 100% full stop behind the line. Apply the handbrake if necessary, take a full look left and right, and only move off when it is completely safe.
3. Poor Junction Observation
Year after year, ineffective observation at junctions remains the number one reason people fail their driving test in Great Britain.
The Mistake: Pulling out onto a main road without checking properly, forcing an oncoming vehicle or cyclist to slow down, swerve, or stop.
Why It’s a Serious Fault: It directly compromises road safety and creates an immediate hazard for other road users.
How to Fix It: Take your time at junctions. Remember: "If in doubt, wait it out." Always look twice, paying extra attention to vulnerable road users like cyclists and motorcyclists before pulling out.
Summary Checklist for Test Day
Before you pull out of the test centre, keep these three golden rules in mind:
🪞 Mirrors First: Check mirrors before every signal, speed change, or direction change.
🛑 Full Stop: Bring the car to a total halt at every STOP sign.
👁️ Look Twice: Ensure a safe, clear gap before emerging from any junction.
Ready to Pass Your Test on the First Try?
The key to avoiding instant test fails is building solid habits through structured, professional driving lessons. At Cambridge Driving Academy, our experienced DVSA-approved instructors specialize in teaching practical road safety, helping you eliminate bad habits and drive with total confidence.
Whether you need manual or automatic lessons, mock test preparation, or international licence conversion, we're here to help!
📲 Book Your Driving Lessons Today:
Phone: +44 1223 658217
WhatsApp: 07496842781
