What should you do?
Move into the left lane in good time and merge in turn if traffic is heavy.
How to recognise it
Orange diamond with an upward arrow on the left and a short blocked bar topped by a crossbar on the right.
Common confusion
In Ireland the offside is the right side (driver's side) and the nearside is the left, next to the kerb.
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.
