What should you do?
Do not exceed 120 km/h and drop well below it in rain, fog or heavy traffic; remember learner permit holders are not allowed on motorways.
How to recognise it
A red-ringed white circle with a large black 120 and km/h beneath it.
Common confusion
120 km/h is the highest limit in Ireland and applies only on motorways; dual carriageways that are not motorways normally have a lower limit.
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.
