The Sallins bypass and the Osberstown interchange on the M7 in Co Kildare will be open by the end of the year.
The interchange will provide an M7 motorway link to Millennium Park, a massive business park in Naas.
It will also be the location of a new 1,000 student second-level school.
The bypass itself will take away many of the 22,000-plus vehicles which pass through Sallins each day.
These two projects were being worked on in tandem with the three-lane motorway widening project, which has been completed outside Naas and Newbridge.
The three projects come with a combined bill of €110m.