Show Me Tell Me Exterior Checks — UK Driving Test 2026
Published 10 Jul 2026 · By AI-Diagnostics-Pro · 10 min read
Exterior checks are a key part of the Show Me Tell Me section of the UK driving test. The examiner may ask you to check lights, tyres, mirrors, wipers, or the windscreen — either before you drive or while you're on the move.
These checks are also essential for passing your MOT and keeping your car safe on UK roads.
1. Lights Check
Lights are one of the most common Show Me Tell Me questions and a major MOT failure point.
How to check all lights:
Turn the ignition on (but don't start the engine)
Switch on the headlights (dipped beam)
Walk around the car and check:
Front headlights (both sides)
Rear tail lights (both sides)
Number plate lights
Side lights
Ask someone to press the brake pedal — check both brake lights work
Activate each indicator — check all four flash correctly
Switch on fog lights — check front and rear fog lights work
MOT connection: Faulty lights are one of the top MOT failure reasons. Check all lights regularly, especially before winter.
2. Tyre Checks
Tyres are critical for safety and are always checked during the MOT.
Tread depth check:
The legal minimum tread depth in the UK is 1.6mm across the central three-quarters of the tread
Use a tread depth gauge, or the 20p coin test:
Insert a 20p coin into the tread grooves
If the outer rim is visible, the tread is below the legal limit
Check across the width of the tyre, not just one spot
Condition check:
Look for cuts, bulges, or damage to the sidewalls
Check for uneven wear (could indicate alignment or suspension issues)
Make sure all tyres (including the spare) are inflated to the correct pressure
Illegal tyres: Driving with tyres below the legal tread limit can result in a fine of up to £2,500 and 3 penalty points per tyre.
3. Mirror Checks
Proper mirror adjustment is essential for safe driving and is checked before the test.
How to set mirrors correctly:
Interior mirror: Adjust so you can see the entire rear window without moving your head
Left door mirror: Adjust so you can just see the rear of your car in the bottom corner — this minimises blind spots
Right door mirror: Same as the left — just see the rear edge of your car
Sitting position matters: Adjust your driving seat first, then set the mirrors. If you change your seating position, the mirrors will need resetting.
4. Windscreen and Wipers
A clean, undamaged windscreen is essential for visibility.
Windscreen check:
Look at the windscreen for chips, cracks, or scratches
Check the area within the driver's swept area (roughly in front of the steering wheel)
Damage larger than 10mm in this area can cause an MOT failure
Damage up to 40mm outside the swept area is generally acceptable
Wiper check:
Turn on the wipers and check they sweep the windscreen cleanly
Look for streaks, missed areas, or squeaking noises
Check the rubber blades for tears, splits, or hardening
Wipers that leave streaks or miss areas need replacing
5. Seat Belt Checks
Seat belts are a safety essential and are checked during both the driving test and MOT.
How to check seat belts:
Pull each seat belt out smoothly — it should extend without sticking
Click it into the buckle — it should lock securely
Give it a firm tug to make sure it holds
Let it retract — it should rewind smoothly
Check the webbing for fraying, cuts, or damage
6. Horn Check
The horn must work to pass the MOT and driving test.
How to check:
With the ignition on, press the horn
It should sound clearly and be loud enough to warn other road users
If it's very quiet or doesn't work, it needs fixing
7. Number Plate Check
Your number plates must be clean, legible, and meet legal requirements.
How to check:
Make sure both front and rear number plates are clean and readable
Check the font and spacing meet UK legal standards
AI-Diagnostics-Pro provides AI-generated information for educational purposes only. Always consult your vehicle handbook and a qualified mechanic for maintenance advice. Content reviewed July 2026.