Commuters heading into Dublin face years of road works as a third lane is proposed for the M11/N11.
Traffic volumes along the stretch have almost doubled over the last two decades.
A second phase of public consultation is to get underway tomorrow on proposals for a major upgrade of the road between the m50/N11 merge and Coyne's Cross in Wicklow according to the Irish Times.
Since the Glen of the Downs was widened, the number of cars has risen from 25,000 a day in 1999 to 53,000 last year - swelling to 78,000 when it hits the Dublin border.
A third lane has been proposed in plans, running for 10kms from the m50 merge to south of Kilmacanogue.
It would also see a redesign of junctions and the closure of a number of access roads.
There are also calls for an express bus lane to be added.