Mirrors, signal, manoeuvre
Mirrors, signal, manoeuvre is the routine you use before almost any change of speed or direction. It makes sure you know what is around you, tell others what you plan to do, and then act safely.
The Rules of the Road reminds drivers to use mirror, signal, mirror, manoeuvre before changing lane: the second check catches anything that changed after you signalled.
By the end of this topic you can
- You can use the routine before moving off, turning, changing lanes, overtaking, slowing and stopping.
- You can choose the right mirrors for each situation.
- You can decide when a signal would help others.
- You can include a blind spot check where needed.
What you need to know and understand
- Check mirrors before signalling, moving off, changing lanes, overtaking, slowing, stopping, turning and opening doors.
- Use the interior mirror plus the door mirror on the side you are moving towards.
- A signal shows your intention. It does not give you right of way.
- Signal clearly and in good time, but not so early that it misleads.
- Mirrors have blind spots. A quick look over the shoulder covers them when moving off or changing lanes.
- The routine should be a habit, done without prompting on every drive.
The routine in order
- Mirrors: check the interior mirror and the door mirror on the side you are moving to. Ask yourself how your plan affects those behind.
- Signal: if it would help any road user, including cyclists and pedestrians, signal clearly and in good time.
- Mirror or blind spot again: check that the situation has not changed, with a look over the shoulder where vehicles may be hidden.
- Manoeuvre: take up the right position, adjust your speed and gear, look properly, then turn, change lane or stop.
Using it in real situations
- Turning left: interior and left mirrors, signal left, watch for cyclists on your left.
- Turning right: interior and right mirrors, signal right, position just left of the centre line.
- Changing lanes: mirrors, signal, quick sideways glance, then move only if the lane is clear. Give way to traffic already in it.
- Stopping: interior and left mirrors, signal left if it helps, then pull in.
- Slowing: check the interior mirror before braking so you know if someone is close behind.
When things change
If your mirror check shows a problem, such as a car overtaking you or a cyclist close on your left, wait. Cancel or delay the manoeuvre rather than forcing it. Remember to cancel your indicator after a turn so it does not mislead others.
The driving test looks for proper use of mirrors and signals, so build the routine in from your very first lessons.
Common mistakes
- Signalling before checking mirrors.
- Glancing at the mirror without acting on what you see.
- Leaving the indicator on after a turn.
- Skipping the blind spot check when changing lanes.
Test yourself: Mirrors, signal, manoeuvre
Answer each question, then read the explanation. Questions come in a random order each time.
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Sources: Rules of the Road, Section 5 Good driving practice (RSA, rsa.ie, Revision 9 May 2026); Rules of the Road, Section 4 Vehicle safety: mirrors (RSA, rsa.ie); Rules of the Road, Section 7 Traffic lights and signals: signalling (RSA, rsa.ie); Rules of the Road, Section 11 Motorways: checking traffic around you, mirror, signal, mirror, manoeuvre (RSA, rsa.ie); RSA, The driving test: what it is and aspects assessed (rsa.ie). Independent guide, not affiliated with any licensing agency. Always check the latest official rules with the RSA.