Highways chiefs have said closure of the A6003 north of Kettering will be slightly longer than planned.
A delay in delivery of road surfacing materials means the southbound carriageway will re-open in the early hours of Sunday, November 17, and not early on Saturday as first stated.
Access will be maintained at all times, to residents/business within the closure.
Vehicles that would normally travel south down the A6003 between Corby and Kettering should use the A6014 (Oakley Road) towards Corby, the A427 towards Weldon, and the A43 southbound (Stamford Road) through Geddington and back on to the A6003 at Kettering.
The northbound carriageway of the A6003 will be open during this phase to allow access from the A14 and Kettering to Corby.