Improvement work on a road between L'Derry and Dungiven is expected to start in Spring this year, according to the Department of Infrastructure (DfI).
A contractor for the project is expected to be appointed in the coming weeks.
Sinn Fein MLA Caoimhe Archibald welcomed the announcement and said it is a significant step in the process of upgrading one of the most used roads in the north of Ireland.
She said: "The upgrade of this 15-mile section of the A6 scheme will start at Drumahoe and will include the bypass around Dungiven, which would help ease the build-up of traffic that often leads to a bottleneck in the town.
"Above all this the process will further increase access to and from the north west, which is long overdue."
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