It starts in the centre of Mullingar and crosses over the
N52 south of the town. In
Rochfortbridge it joins the
R446, (the former
N6), then leaves it southwards crossing over the M6 motorway at a grade separated junction. Continuing south it enters
County Offaly and then for 25 km it crosses the western edge of the
Bog of Allen; going through the village of
Rhode, crossing the
Grand Canal, intersecting with the
R402, skirting the village of
Walsh Island before terminating in
Cushina. The route is long. ==Map of the route==