The €120m (£107m) project will involve the upgrading of the existing M7 motorway from two lanes to three in each direction as well as the construction of a new 5km green field bypass around the town of Sallins.
The scheme will see the construction of six new structures, including two bridges over the River Liffey, a bridge over the Grand Canal and a new Interchange bridge over the M7 motorway.
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