What should you do?
Check mirrors and blind spot, signal right and merge smoothly into the right-hand lane.
How to recognise it
A black square with four amber corner lamps and a green arrow pointing diagonally down to the right.
Common confusion
The direction of the diagonal arrow shows which lane to move into; don't confuse it with the left-pointing version.
Explanation written by the My Driving Test editorial team using the Department of Transport Traffic Signs Manual conventions and the RSA Rules of the Road.
