Commuters in the H-spine area of Dublin will be able to avail of the new bus service from Sunday.
It serves Howth, Baldoyle, Donaghmede, Raheny, Malahide, and Portmarnock.
Up next in the plan is the C-spine route, scheduled for launch in the autumn and serving the Lucan area and spanning out as far as Maynooth and Celbridge in Kildare.
The overhaul of the transport system includes 16 new bus corridors and 230 kilometres of bus priority lanes, as well as the felling of 3-000 trees, which faced significant opposition from locals.
