Road signs in the Republic of Ireland do not differ greatly from those used elsewhere in Europe – with the notable exception that hazard or warning signs follow the 'MUTCD' style of a yellow diamond shape. The symbols used on these warning signs do, nevertheless, resemble much more closely those used (on red-bordered white or yellow triangles) in the rest of Europe than many of those seen in the United States.
Regulatory signs differ very little from those used in the rest of Europe, the main exception being that red-bordered white signs indicate a restriction as opposed to a prohibition, which is instead indicated with an additional red diagonal line across the sign.
The system of directional signs is based upon, and is very similar to, that employed in the United Kingdom, but is bilingual everywhere except in the Gaeltacht, where only the Irish language is used on signs.