The N51 road is a national secondary road

National secondary road

A national secondary road 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...

 in Ireland

Republic of Ireland

Ireland , described as the Republic of Ireland , is a sovereign state in Europe occupying approximately five-sixths of the island of the same name. Its capital is Dublin. Ireland, which had a population of 4.58 million in 2011, is a constitutional republic governed as a parliamentary democracy,...

.
West to east, it starts in Delvin

Delvin

Delvin is a small town in east County Westmeath, Ireland located on the N52 road at a junction with the N51 to Navan. The town is from Mullingar and is the setting of the book Valley of the Squinting Windows by Delvin native Brinsley MacNamara, described under the fictitious name of "Garradrimna"...

, County Westmeath

County Westmeath

-Economy:Westmeath has a strong agricultural economy. Initially, development occurred around the major market centres of Mullingar, Moate, and Kinnegad. Athlone developed due to its military significance, and its strategic location on the main Dublin–Galway route across the River Shannon. Mullingar...

 at a junction with the N52

N52 road (Ireland)

The N52 road is a national secondary road in Ireland. It links the M7 motorway from just south of Nenagh, County Tipperary to the M1 motorway north of Dundalk in County Louth.The road is long.-Quality of Road:...

. It passes through Athboy

Athboy

Athboy , is a small agricultural town in County Meath in Ireland. It is located on the junction of the N51 and R154 roads. The town is located on the Yellow Ford River, in wooded country near the County Westmeath border.-History:...

, a junction with M3 motorway, Navan

Navan

-People:Navan was the childhood home of Pierce Brosnan, who appeared in the television series Remington Steele and was the fifth film actor to play James Bond. TV personality Hector Ó hEochagáin, and comedians Dylan Moran and Tommy Tiernan also hail from Navan....

 and Slane

Slane

Slane is a village in County Meath, in Ireland. The village stands on a steep hillside on the left bank of the River Boyne at the intersection of the N2 and the N51 . In 2006 Slane's population was 1,099, having grown from 823 in 2002. The population of the village and the surrounding rural area...

, all in County Meath

County Meath

County Meath is a county in Ireland. It is part of the Mid-East Region and is also located in the province of Leinster. It is named after the ancient Kingdom of Mide . Meath County Council is the local authority for the county...

, before crossing the M1 motorway and terminating near Drogheda

Drogheda

Drogheda is an industrial and port town in County Louth on the east coast of Ireland, 56 km north of Dublin. It is the last bridging point on the River Boyne before it enters the Irish Sea....

 in County Louth

County Louth

County Louth is a county of Ireland. It is part of the Border Region and is also located in the province of Leinster. It is named after the town of Louth. Louth County Council is the local authority for the county...

 at a roundabout on the R132

R132 road

The R132 road is one of Ireland's newest regional roads, having been classified following the opening M1 motorway which by-passes most of the old N1 route.By-passed sections of the old N1 were reclassified R132...

.

It is an unusual arrangement for a national secondary road to terminate at a regional road. However the R132 is the former N1 route (now by-passed by the M1 motorway) and is of a higher standard than most regional roads.

Upgrade

On 15 May 2009 Phase 2B of the N51 Navan Inner Relief Road was opened to traffic. This route provides a direct link between the N3/M3 Kells Road and the N51 Athboy Road. On the same day a further 3.9 kilometres of the realigned N51 which has been constructed as part of the M3 motorway scheme was opened to traffic, 2.5 kilometres of which is Type 1 dual carriageway.

See also

• Roads in Ireland
  Roads in Ireland
  The island of Ireland, comprising Northern Ireland and the Republic of Ireland, has an extensive network of tens of thousands of kilometres of public roads, usually surfaced. These roads have been developed and modernised over centuries, from trackways suitable only for walkers and horses, to...
  
  
• Motorways in Ireland
• National primary road
  National primary road
  A national primary road is a road classification in the Republic of Ireland. National primary roads form the major routes between the major urban centres. There are over 2,700km of national primary roads. This category of road has the prefix "N" followed by one or two digits...
  
  
• Regional road
  Regional road
  A regional road in Ireland is a class of road not forming a major route , but nevertheless forming a link in the national route network. There are over 11,600 kilometres of regional roads. Regional roads are numbered with three digit route numbers, prefixed by "R" A regional road in Ireland is a...