N51 road (Ireland)

N51 road shield}}
N51 road
Bóthar N51
IMG_N51road2888.jpg
N51 leaving Athboy
Route information
Length52.994 km (32.929 mi)
Location
CountryIreland
Primary
destinations
(bypassed routes in italics)
Highway system

The N51 road is a national secondary road in Ireland. West to east, it starts in Delvin, County Westmeath at a junction with the N52. It passes through Athboy, a junction with M3 motorway, Navan and Slane, where it crosses the N2 road, all in County Meath, before crossing the M1 motorway and terminating near Drogheda in County Louth at a roundabout on the 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.