The road narrows on the right sign displays a vertical black line on the left and an inward-sloping line on the right within a red triangle.
It warns drivers that space on the right side decreases ahead, requiring vehicles in right-hand lanes or near the centre line to adjust positioning.
What this sign means
This sign alerts road users that the carriageway narrows specifically from the right-hand side ahead.
- Red triangle warning boundary
- Inward slant on the right side symbol
- Signals loss of width or lane closure on the right
What to do when you see it
Check mirrors early. If travelling on a dual carriageway where a right lane ends, move safely into the left lane using zip-merging principles where appropriate.
- Indicate and merge early if your lane closes
- Allow space for vehicles merging from the right
- Reduce speed to manage tighter space margins
How this sign is tested
Theory tests evaluate correct lane discipline, mirror usage, and safe merging techniques when lanes taper.
Common mistakes
Failing to check blind spots before merging left or speeding up to block vehicles merging from the right.
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Practise road sign questionsFrequently asked questions
How does this differ from the 'road narrows left' sign?
This sign shows the right side narrowing inward while the left side remains straight.
Who has priority when the right lane narrows into the left?
Neither lane has absolute right-of-way; drivers should merge smoothly and safely in turn.
What supplementary plates might appear below this sign?
Distance plates (e.g. '200 yards') often inform drivers where the taper begins.