Work will start on a section of the A6 Derry to Belfast road later this year.
Work will begin this summer from the Castledawson roundabout to Toome Bypass and from the Toome Bypass to end of the M22 at Randalstown.
The work is expected to take two years to complete and will cost approximately £130m. Once the work is finished it will turn what was a single lane of traffic into a dual carriageway.
The upgrade is expected to slash the length of time it takes to travel from Derry to Belfast.
Transport Minister, Michelle McIlveen described the announcement as a “major investment for the North West”.
“Last month the Northern Ireland Executive announced a package of funding to take forward major flagships projects, including the Randalstown to Castledawson section of the A6.
“This is a major investment for the North West and will be very welcome news to the local construction industry.
“The A6 dualling scheme is a significant project that will help to remove a major bottleneck and so improve safety and journey times on this strategically important route.”