Anational secondary road (Irish: Bóthar Náisiúnta den Dara Grád) is a category of road in Ireland. These roads form an important part of the national route network but are secondary to the main arterial routes which are classified as national primary roads. National secondary roads are designated with route numbers higher than those used for primary roads, but with the same "N" prefix. Routes N51 and higher are all national secondary roads.
National secondary roads have a default speed limit of 100km/h, they fall into the speed limit category of national roads.
There are 2657 km of national secondary roads in Ireland, making up slightly over 50% of the entire national route (national primary and national secondary) network.[1] National secondary routes are generally more poorly maintained than primary routes (although their quality can vary widely), but often carry more traffic than regional roads. Almost the entire network of national secondary roads is single carriageway, although there are some short sections of dual carriageway on the Tallaght bypass section of the N81, on the N52atDundalk, on the N85atEnnis, on the N62atAthlone, on both the N69 and N70atTralee and on the N71 between Cork and Bandon. Typically, national secondary roads are of a similar standard or higher than regional roads although some are of lower quality than the better sections of regional roads. Many of them have been resurfaced with higher quality pavements in recent years with relatively smooth surfaces and good road markings and signposting. However, road widths and alignments are often inadequate, with many narrow and winding sections.
In the past, most national secondary roads would have run through the centres of the towns on their routes; however, recently, that is less often the case. For example:
The former N8 bypass of Mitchelstown was re-classified as the N73 when the Fermoy (Moorepark) to Kilbehenny section of the M8 was completed.
Most national secondary roads were originally Trunk Roads under the old system of road classification in Ireland, although some sections of national secondary routes were formerly Link Roads. Many less important Trunk Roads became regional roads when the road classification system changed from 1977 onward, including some roads, such as the N72 between Killarney and Killorglin, the N86 and the N87, which were originally re-classified as regional roads but later re-classified again as national secondary routes. In 1994, three national secondary roads were reclassified as national primary roads: the N57 between Swinford and Ballina became the N26, the N64 between Oranmore and Claregalway became part of the N18 and the N79 between New Ross and Enniscorthy became the N30. In addition, a section of the N60 between Castlebar and Westport became part of the N5.
Some national secondary roads, though not arterial routes between major cities, connect scenic areas to major population centres. For example, the N59 through County Galway and County Mayo, the N70 road through County Kerry (see Ring of Kerry) and the N71 through West Cork. For this reason, many national secondary roads are well-travelled by tourists.
(XXXX) = Junction with road XXXX, e.g. (N21) = Junction with N21 road
| National Secondary Roads in Ireland | ||
|---|---|---|
| Road Name | Description | Length |
 N51 |
(M1) west of Drogheda – Slane (N2) – Navan (M3) – Athboy – Delvin (N52 to Mullingar) | 52.994 km (32.929 mi) |
 N52 |
Ardee (N2) – Kells (N3) – Delvin (N51) – Mullingar – (Joins M6) near Tyrrellspass – (Leaves M6) near Kilbeggan – Durrow – Tullamore (N80) – Birr (N62) – Borrisokane (N65) – (M7 west of Nenagh) | 177.694 km (110.414 mi) |
 N53 |
DundalktoCastleblayney (a short section of the road becomes the A37 where it runs through County Armagh) | 18.122 km (11.260 mi) |
 N54 |
Monaghan (N2) – Clones – Cavan (N3) (a short section of the road becomes the A3 where it runs through County Fermanagh) | 34.626 km (21.516 mi) |
 N55 |
(N3 just outside Cavan) – Granard – Edgeworthstown (N4) – (N6 Athlone ringroad) | 78.815 km (48.973 mi) |
 N56 |
(N15 just east of Donegal) – (R263 near Killybegs) – Glenties – Dungloe – Gweedore – Dunfanaghy – Letterkenny (N14) | 157.304 km (97.744 mi) |
 N58 |
Foxford (N26) – (N5 between Swinford and Castlebar) | 11.259 km (6.996 mi) |
 N59 |
(N4toSligo) – Ballina (N26) – Bangor Erris – Rosturk – Westport (N5) – Clifden – Oughterard – Moycullen – Galway (N6) | 298.795 km (185.663 mi) |
 N60 |
Castlebar – Claremorris (N17) – Ballyhaunis – Castlerea – Ballymoe – Roscommon | 92.217 km (57.301 mi) |
 N61 |
Athlone (N6) – Knockcroghery – Roscommon – Tulsk (N5) – Boyle (N4) | 74.193 km (46.101 mi) |
 N62 |
M6 near AthlonetoM8atHorse and Jockey) M6 – Ferbane – Cloghan – Birr – Roscrea – Templemore – Thurles – Horse and Jockey (M8) | 96.625 km (60.040 mi) |
 N63 |
(N63 Galway city to Longford town) Galway – Claregalway – Lackagh – Turloughmore – Abbeyknockmoy – Moylough – Mountbellew – Newbridge – Ballygar – Mount Talbot – Athleague – Roscommon – Lanesborough-Ballyleague – Longford (N5) | 96.393 km (59.896 mi) |
 N65 |
M6 north of LoughreatoN52atBorrisokane; crossing the River ShannonatPortumna | 52.517 km (32.633 mi) |
 N67 |
Galway – Kinvara – Ballyvaughan – Lisdoonvarna – Ennistymon (N85) – Kilkee – Kilrush (N68) – (ferry pier near Killimer) (ferry pier near Tarbert) – Tarbert (N69) | 129.172 km (80.264 mi) |
 N68 |
KilrushtoEnnis | 40.569 km (25.208 mi) |
 N69 |
Dock Road (Limerick) – Mungret – Clarina – Kildimo – (Askeaton) – Foynes – Tarbert (N67) – Listowel – Tralee (N21, N22, N70, N86) | 97.476 km (60.569 mi) |
 N70 |
(Comprises most of the Ring of Kerry) – (N70 Killarney RoadatKenmare) – Sneem – Castlecove – Caherdaniel – Waterville – Cahersiveen – Killorglin – (N72) – Milltown – Castlemaine – (N86) – (N21, N69) Tralee | 141.691 km (88.043 mi) |
 N71 |
(N22) Cork (Wilton Road, Bishopstown Road, Bandon Road) – Halfway bypass – Innishannon – Bandon – Ballinascarty – Clonakilty – Rosscarbery – Leap – Skibbereen – (R592toBallydehob) – Bantry – Ballylickey – Glengarriff – Kenmare – (N70) – Muckross – Killarney (N22, N72) | 187.270 km (116.364 mi) |
 N72 |
Killorglin – Killarney (N22) – Rathmore – Mallow (N20) – Fermoy (M8) – Lismore – Dungarvan (N25) | 165.923 km (103.100 mi) |
 N73 |
Mitchelstown (M8) – (N72 east of Mallow) | 34.296 km (21.311 mi) |
 N74 |
(M8) Cashel – Golden – Kilfeakle – Tipperary (N24) | 19.915 km (12.375 mi) |
 N75 |
Thurles to the M8 near Two-Mile Borris | 7.552 km (4.693 mi) |
 N76 |
(N10) Kilkenny Ring Road – Ballymack – Callan bypass – Ninemilehouse – (N24 east of Clonmel) | 43.686 km (27.145 mi) |
 N77 |
(N10) Kilkenny Ring Road – (N78) – Ballyragget – (M7) at Portlaoise | 48.742 km (30.287 mi) |
 N78 |
(N77) – Castlecomer – (N80) – Athy – (M9) near Ballitore | 50.671 km (31.485 mi) |
 N80 |
(N52) near Tullamore – Mountmellick – crosses the (M7) at Portlaoise (connects to M7 via R445) – Stradbally – (N78) Carlow – (M9) near Tinryland – (N81) – Kildavin – Bunclody – (N11) near Enniscorthy | 114.683 km (71.261 mi) |
 N81 |
(M50) at Templeogue – Tallaght Bypass – Baltinglass – Tullow – (N80 just east of Ballon) | 76.784 km (47.711 mi) |
 N83 |
Tuam – Dunmore – Cloonfad – Ballyhaunis – Tooreen – N17 south of Charlestown | 45.222 km (28.100 mi) |
 N84 |
Galway – Cloonboo – Headford – Shrule – Kilmaine – Ballinrobe – Castlebar | 73.545 km (45.699 mi) |
 N85 |
Ennis (M18) – Ennistymon (N67) | 31.858 km (19.796 mi) |
 N86 |
Tralee – Annascaul – Lispole – Dingle | 50.235 km (31.215 mi) |
 N87 |
Belturbet (N3) – Ballyconnell – Swanlinbar – (border with Northern Ireland where it becomes the A32) | 28.136 km (17.483 mi) |
| Total | National Secondary route network | 2,657 km (1,651 mi) |
: Swinford – Ballina; upgraded to a primary route as the N26 in 1994.
: Oranmore – Claregalway; upgraded to primary route status as the N18, but after the M18/M17 route was completed to Tuam in 2017, it was downgraded to the R381.
: Gort – Loughrea; downgraded to the R380 in 2017 after the M18 was extended to the M6.
: Enniscorthy – New Ross; upgraded to a primary route as the N30 in 1994.
: N7 to the N81 in southwest Dublin; decommissioned in 2012.
