R449 road (Ireland)

The R449 road is a regional road in County Kildare, Ireland. It is just long and was completed in 2003 as part of the construction of a grade separated interchange to connect both west Leixlip and north Celbridge to the M4 motorway at Junction 6.
The 2 km section between Leixlip and the M4 is dual-carriageway. The speed limit along this section is 60 km/h, despite joining an 80 km/h road with 120 km/h road, via a dual carriageway.
The road crosses the Dublin-Sligo railway line and the Royal Canal. The bridge on which it crosses collapsed during construction, blocking the railway line for a time.
From north to south the road leaves the R148 regional road, crosses the M4 and terminates at the R405 north of Celbridge.