Work to upgrade the A6 between Randalstown and Csatledawson into a dual carriageway is expected to begin in October.
The project is to last four years and will cost £160 million.
It will cover a stretch of 14.7km, approximately nine miles, on either side of the Toome Bypass.
According to the Department for Infrastructure, 18,000 vehicles pass through the section of the road each day. (August 2016)