Mirrors, Observation & The MSM Routine

Mirror checks are one of the most heavily marked areas of the test. The examiner is watching to see whether checking around you has become an automatic habit.

Observation, Signalling & Planning (8-13)6 min readLast updated: May 2026

Reviewed by Chris Jackson, DVSA-approved ADILast reviewed: May 2026

The full guide

Checking your mirrors should be as automatic as breathing. Before every change of speed, direction, or road position, you need to know what is happening around you. The examiner watches for mirror use constantly because it is one of the strongest indicators of a safe driver.

Use your mirrors in this order: interior mirror first, then the door mirror on the side you intend to move towards. The interior mirror shows what is directly behind you. The door mirrors show your blind spots and what is travelling alongside you.

You must check mirrors before signalling at junctions, roundabouts, and bends; before changing lanes or overtaking; before slowing down or stopping; before starting any manoeuvre; and before opening your door. Missing mirror checks is one of the most common reasons for failing the test, and it is entirely avoidable.

Physical shoulder checks are just as important as mirror checks. Before moving off, changing lanes, or reversing, turn your head to check the blind spots that mirrors cannot see. Cyclists and motorbikes can sit in these invisible zones, and failing to check is a serious safety risk.

Common faults

Moving off or changing direction without checking mirrors first
Relying on mirrors alone and skipping the physical blind spot check
Checking mirrors after starting a manoeuvre rather than before
Only glancing at one mirror instead of the relevant ones
Seeing a hazard in the mirror but ignoring it and proceeding anyway
Checking mirrors so subtly that the examiner cannot see your eyes move

What the examiner looks for

You check mirrors before every signal and direction change
You use the correct sequence: interior mirror first, then the relevant door mirror
You perform physical blind spot checks before moving off or changing lanes
You respond to what you see: waiting if a vehicle is in your blind spot
You keep your mirror checks regular and obvious throughout the drive

Quick tips

Make your mirror checks visible: the examiner needs to see your eyes move
Practise saying 'mirror, mirror, signal' aloud until it becomes automatic
Before every junction and roundabout: interior mirror first, always
Your blind spot check before moving off is critical: cyclists can appear in seconds
If your mirror shows a vehicle nearby, do not ignore it: change your plan

Common questions about mirrors, observation & the msm routine

How frequently should I check mirrors?

Every few seconds while driving normally, and without fail before any change of speed, direction, or position. Regular checks build a constant picture of what is around you.

What exactly is a blind spot?

The area alongside and slightly behind your car that your mirrors do not cover. Small vehicles, cyclists, and motorbikes can hide there. You must physically turn your head to check before moving off or changing lanes.

Will one missed mirror check fail me?

A single missed check is usually a minor fault. However, repeated missed checks or a dangerous situation caused by not looking can become a serious fault. Consistency matters more than perfection on a single check.

Do I need to check mirrors before braking?

Yes, particularly if you are braking more than gently. The driver behind needs warning. A mirror check before braking shows you are aware of following traffic and can brake progressively.

Should I check mirrors when changing speed?

Yes. Before any significant speed change, glance in your interior mirror. You need to know if someone is close behind so you can slow down smoothly and give them time to react.

What if I check mirrors and see nothing?

That is perfectly fine. The examiner is assessing your habits, not requiring you to find traffic every time. Checking when the road is empty proves you are thinking about other road users. The habit itself is what scores marks.

Ready to put this into practice?

These guides are a great starting point, but nothing replaces working with a DVSA-approved instructor who can give you real-time feedback.

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