What should you do?
Keep within your lane as it moves left and keep a steady speed alongside other traffic.
How to recognise it
Orange diamond with two parallel black arrows both stepping across to the left.
Common confusion
Do not confuse it with a lane closed sign; here no lane is lost, the lanes just shift.
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.
