Legal Basis
Signage in Ireland is prescribed under the Traffic Signs Manual 2010 (TSM), issued by the Department of Transport. Published in late 2010 after a long period of review, this replaced at least one older edition, the Traffic Signs Manual 1996.
Older signs appear in secondary legislation (see the references section at the bottom), however much of the signage (particularly directional signage) used has never been legally prescribed for. The TSM itself is not a law. However, signage is meant to be based on the principles in it. It is partially based (particularly directional signage) on the United Kingdom Traffic Signs Manual, itself based on the Traffic Signs Regulations and General Directions.
Those road signs which are prescribed in law are prescribed under the Road Traffic (Signs) Regulations 1997-2004, the 1997 regulations being the main set which repealed various traffic signs regulations dating back to 1964.
Read more about this topic: Road Signs In Ireland
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