Continuing south through Mayo into County Galway, the road passes through the village of Leenaun.

The 182-year-old bridge in the centre of the village, carrying the road across the River Lahill, collapsed in floods on 18 July 2007.

Due to the local terrain and road network, the diversionary route for getting from the south of the village to Westport was 110 km long.

From there, it returns east through Maam Cross and to Oughterard, from which it proceeds southeast to Galway city.

The project will be approximately 13 km long with at-grade junctions where necessary providing opportunities to interact with the existing road network.