It is a major route in the West connecting Galway city with Castlebar.

The route is of poor quality with a few short good sections in County Mayo between Ballintubber and Ballinrobe.

Ballinrobe has become a bottleneck on the route in recent years with up to 8,000 vehicles passing through the town's one-way streets.

You can help Wikipedia by expanding it.This article related to the geography of County Mayo, Ireland is a stub.

You can help Wikipedia by expanding it.This article related to the geography of County Galway, Ireland is a stub.