A new local access road will open next week linking Catterick Central Junction and Leeming Lane at Catterick Village.
Vehicles will only be able to travel on the road southbound for the first week from Friday, July 14.
However, from Friday July 21 motorists will be able to drive in both directions along the road.
The temporary junction onto the A1 at Marne Barracks will then be closed and work will continue on the A1 between Catterick Village and the Leeming junction.
The next step will be to open the local access road all the way between Catterick Central and the Leeming junction.