Two national primary routes pass through the county, The N3 and the N2. The M3 becomes the N3 south of Kells before continuing on to County Cavan, a distance of . The N2 begins at Ashbourne and crosses the county for roughly before entering County Louth near Collon. Two national secondary routes pass through the county. The majority of the N51 Drogheda to Mullingar route is located within Meath, and crosses the county for , passing through Slane, Navan and Athboy.