The Government's Transport 21 strategy is in for a major shake-up.
Amid fears of crippling congestion in the capital for the next five years, plans to join the two Luas lines are being postponed.
A number of projects were expected to be under construction together, including the Metro from the City Centre to the Airport and new and extended Luas lines.
Dublin City Council is now looking to produce massive changes to existing traffic plans.
The Minister for Transport Noel Dempsey has hinted at possible restrictions on the number of cars allowed into the city centre during construction.