WORK to upgrade the A6 between Randalstown and Castledawson into a dual carriageway is expected to begin in October.
The project is set 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.
The stretch between Castledawson and Randalstown is one of the busiest in the north, and is often reduced to a traffic jam at key times.
According to the Department for Infrastructure, 18,000 vehicles pass through the section of the road each day.
Infrastructure Minister Chris Hazzard said: "One of my key priorities over the next five years is redressing the north’s infrastructure deficit, particularly west of the Bann.
"My commitment to this area in delivering this £160million flagship investment will strengthen the links between Belfast and Derry and positively develop the A6 as a key transport route into the wider north-west area.
Mr Hazzard added: "Road users and the local community will directly benefit from this new all-purpose dual carriageway as it will reduce journey times and improve road safety."
The department has said that the project will involve "training opportunities for both young and long-term unemployed people."
In May last year, a joint venture between Graham and Farrans was awarded the contract for the development of the plans.
