Road Network
The road network is divided into the following categories:-
| Category | Description | Length |
| Motorway | M6 | 20 Km (12.5 miles) |
| National Primary Roads | N4, N5 & N6 | 85 Km (52.5 miles) |
| National Secondary Roads | N60, N61, N63 & N83 | 147 Km (91 miles) |
| Regional Roads(Non-National) | R-various numbers | 373 Km (231 miles) |
| Local Roads (Non-National) | L-various numbers | 3362Km (2085 miles) |
National Primary Roads
There are three national primary roads in County Roscommon
- N4 Dublin to Sligo – from Cortober to Sligo County Boundary at Sheegory, North of Boyle.
- N5 Longford to Westport – from Tarmonbarry to Mayo County Boundary North West of Ballaghaderreen.
- M6 Kinnegad to Galway from the intersection with the N6 at the Old Tuam Road Bridge to the Galway County Boundary at the River Suck.
National Secondary Roads
There are four national secondary roads in the County:
- N60 Roscommon to Castlebar – From Roscommon Town to Mayo County boundary at Scregg, West of Ballinlough.
- N61 Athlone to Boyle – via Roscommon
- N63 Longford to Galway – from Lanesboro Bridge to Mount Talbot Bridge via Roscommon
- N83 Tuam to Glentavraun – from Galway County boundary at Cloonfad West to Mayo County boundary at Gorteen via Cloonfad.
Regional Roads
There are twenty one Regional Roads in the County:-
- R280 Bundoran to Carrick-on-Shannon from the Leitrim County Boundary at Cartron Beg to the Leitrim County Boundary at the Galley Bridge via Mountallen.
- R284 Carrowroe (County Sligo) to Leitrim Village (County Leitrim) – from the Sligo County Boundary near Ballyfarnon to the Leitrim County Boundary at Battlebridge via Ballyfarnon, Keadue and Drumboylan.
- R285 Ardcarn to Mountallen – from its junction with the N4 at Ardcarn to its junction with the R280 at Mountallen via Knockvicar and Keadue
- R293 Ballynaboll (County Sligo) to Ballyhaunis – from the Sligo County Boundary at Drumacoo to the Mayo County Boundary at Tully via Ballaghaderreen, Crinaun Bridge, Lisacul and Meelick.
- R294 Boyle to Ballina – from its junction with the N4 at Killbyran, Boyle to the Sligo County Boundary at Tivannagh.
- R295 Boyle to Ballymote – from its junction with the R294 at Mockmoyne, Boyle, to the Sligo County Boundary at Cornameelta.
- R325 Cloonarragh, Castlerea, to Glentavraun (County Mayo) – from its junction with the R361 at Cloonarragh to the Mayo County Boundary at Ishlaun via Loughglynn and Crinaun Bridge.
- R326 Loughglynn to Meelick – from Loughglynn to its junction with the R293 at Meelick.
- R327 Pollredmond (County Galway) to Cuilmore (County Mayo) – from the Galway County Boundary at Coolcam to the Mayo County Boundary at Culnacleha Bridge via Cloonfad.
- R357 Athleague to Blueball (County Offaly) – from Araghty Athleague to Shannonbridge via Four Roads, Dysart and Ballinasloe.
- R361 Boyle to Williamstown – from its junction with the N61 at Greatmeadow, Boyle to the Galway County Boundary at Derreenteige via Breedoge, Frenchpark, Castlerea and Trien.
- R362 Monksland to Dunmore – from its junction with the R446 at Monksland to the Galway County Boundary at Aughagower via Bealnamullia, Ballymullavill, Curraghboy, Rahara, and Athleague.
- R363 Bealnamullia to Newbridge (County Galway) – from its junction with the R362 at Ballymullavill to the Galway County Boundary at Ballyforan Bridge via Brideswell, Dysart and Ballyforan.
- R366 Roscommon to Aughagower – from Roscommon to its junction with the R362 at Aughagower via Fuerty and Castlecoote.
- R367 Ballymoe to Tulsk – from its junction with the N60 at Drimatemple to the junction with the N5 at Tulsk via Ballintober and Castleplunkett.
- R368 Four-Mile-House to Carrick-on-Shannon from its junction with the N61 at Four-Mile-House to its junction with the N4 at Cortober via Strokestown and Elphin.
- R369 Elphin to Gortnagoyne – from its junction with the R368 in Elphin to its junction with the N5 at Gortnagoyne, Ballinagare via Shankill crossroads and Mantua.
- R370 Frenchpark to Carrick-on-Shannon – from its junction with the R361 at Carrowreagh, Frenchpark, to its junction with the R368 at Mullaghmore, Carrick-on-Shannon via Ballinameen, Rathallen crossroads and Croghan.
- R371 Ballyleague to Rooskey – from its junction with the N63 at Ballyleague to the Leitrim County Boundary at Rooskey Bridge via Cloontuskert, Curraghroe, Scramogue and Kilglass.
- R377 Castlerea to Castleplunkett – from its junction with the N60 in Castlerea to Castleplunkett via Knockmurry, Ballinphuill and Lisalway.
- R446 (Old N6) Kinnegad to Galway – from Athlone Town Boundary to Ballinasloe Town Boundary via Cornafulla, Clonark and Ballydangan.
Local Roads
All other roads in the County which are not in the three categories described above are local roads.
Public Road
A Public Road means a road over which a public right of way exists and the responsibility for the maintenance of which lies with a road authority.
To declare a road public:
The road must be of general public utility and a public right of way must exist over the road. The road authority must consider the financial implications of taking on responsibility for an additional public road and must consider any objections or representations made by the public.
Roads built by a local authority are held to be public roads when their construction is intended for use by the general public. Therefore, unless the road authority decides otherwise, all roads constructed by it automatically become public roads thus eliminating the need for a formal declaration process.
To abandon a public road:
The power to abandon local roads is devolved to the elected members of the local authority but any order to abandon a national or regional road must be approved by the Minister. He in turn must consult with the NRA before making a decision affecting a national road.
Once a road has been abandoned the road authority is no longer responsible for its maintenance but the abandonment does not extinguish the public right of way over the road.
Extinguish a Public Right of Way
This power is devolved to the elected members subject to the approval of the Minister where the extinguishment applies over a national or regional road. In the case of a national road the Minister must consult with the NRA.