Up to 1,300 Dublin homes may have to lose gardens and parking places to make way for Bus Connects.
Average bus speeds on many routes are about half of what they should be and the 2 billion euro project involves creating a network of 16 expanded bus lanes on the city's busiest routes.
The aim is to make services more reliable and punctual by 2027.
Buses will be given continuous priority on main arteries into town from places like Finglas, Rathfarnham and Clondalkin.
So for instance, it currently takes 32 minutes to travel 4 kilometres between Tallaght and Terenure. But under Bus Connects, it's envisaged the commute would take 10-12 minutes.
But under the plans to be revealed today, up to 1300 Dublin homes could lose parking and part of their gardens to make way for the change.
It's reported the National Transport Authority would pay compensation and for gardens to be redesigned, while some of the land would be secured with Compulsory Purchase Orders.
The NTA is also proposing 200 km of cycle track.