Transport Minister Eamon Ryan has slammed plans to double the capacity of Dublin Port as "untenable".
Dublin Port Company unveiled plans to expand the Port and build a new bridge and 2.2km of road across the River Liffey earlier last month. Under the plans, the Port's capacity to transport goods via truck will double.
The 3FM project argues the road and bridge will take trucks off local roads. However, the Green Party leader told RTE the plans would "clog" the M50 and should include rail freight.