Motorways in the Republic of Ireland

In Ireland, the highest category of road is a motorway (mótarbhealach, plural: mótarbhealaí), indicated by the prefix M followed by a one- or two-digit number (the number of the national route of which each motorway forms a part). The motorway network consists entirely of motorway-grade dual carriageways and is largely focused upon Dublin. There are several three-lane motorways. Ireland's busiest road, the M50, incorporates four-lane, five-lane, and six-lane stretches.

The completion of the Major Inter-Urban Motorway Project in December 2010, connected Dublin to the cities of Cork, Limerick, Waterford and Galway by continuous motorway, as well as a number of other projects, increased Ireland's motorway network to 916 km. Planned new road construction will possibly lead to almost 1,100 km of motorway by 2035, subject to the availability of funding.

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