Free road signs guide

Irish road signs and their meanings

Every road sign, road marking and traffic light pictured in the Irish Driver Theory Test (DTT) questions, 143 in all, grouped by type. Select a sign to see its question and a full explanation.

How to read Irish road signs

A sign’s shape and colour tell you what kind of message it gives, even before you can make out the symbol.

Red circle: A limit or something you must not do, such as a speed limit, no entry or no overtaking. Speed limits are in km/h.
Blue circle: An instruction you must follow, such as turn left, keep left or pass either side.
Octagon and inverted triangle: Stop is the only eight-sided sign and Yield the only inverted triangle, so you can recognise both from their shape alone.
Yellow diamond: A warning of a hazard ahead, such as a bend, a junction, a school or animals on the road.
Orange diamond: A temporary warning at roadworks, such as a lane closure, a flagman or loose chippings.
Blue rectangle: Motorway signs, and bus, tram and cycle lane signs. Direction signs are blue on motorways, green on national roads and white on regional and local roads.
White and yellow lines: Never cross a continuous white centre line; cross a broken one only when it is safe. A single yellow edge line limits parking at the times shown on a nearby plate, and a double yellow line means no parking at any time.