Motorway countdown markers are rectangular blue signs with slanted white bars positioned along the left verge before an exit slip road.
They provide drivers with successive distance markers to prepare safely for leaving the motorway.
What this sign means
Each white stripe on a countdown marker represents approximately 100 yards of distance to the start of the exit slip road.
They ensure drivers have clear notice to position their vehicle in the left-hand lane without sudden late manoeuvres.
- 3 white bars: Approximately 300 yards to exit slip road.
- 2 white bars: Approximately 200 yards to exit slip road.
- 1 white bar: Approximately 100 yards to exit slip road.
What to do when you see it
Ensure you are in the left-hand lane before or by the 3-bar marker if you intend to leave at the upcoming junction.
Signal left around the 300-yard mark and maintain speed until you step onto the deceleration slip road.
How this sign is tested
Theory questions test the exact distance represented by each bar on motorway countdown markers.
Hazard perception clips assess timely positioning and signaling when preparing to leave a motorway.
Common mistakes
Cutting across middle or right-hand lanes at the last moment near the 1-bar marker to reach the exit.
Slowing down significantly on the main carriageway before entering the exit slip road.
Test yourself on this one
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Practise road sign questionsFrequently asked questions
How far apart are motorway countdown markers?
Each bar represents roughly 100 yards, spacing the markers at approximately 300, 200, and 100 yards from the exit.
Are countdown markers green on non-motorway roads?
Yes, primary A-roads use green countdown markers with white bars to indicate upcoming junction exits.
When should I signal left to leave the motorway?
Signal left at or near the 3-bar (300-yard) marker after checking your mirrors and securing your left lane position.