Trunk roads in Ireland

A trunk road was a road in the Republic of Ireland of the highest classification between 1926 and 1977. The lower classifaction of main road was termed a link road. Trunk and link roads were identified by numbers prefixed with the letter T or L respectively; lesser roads had no such identifiers. In 1977 the classification was changed to national primary and secondary, regional, and local roads. Typically, each segment previously classified as trunk or link respectively became national or regional, but the numbering was done on a new basis.