Work to widen a major roundabout is due to begin next week and will use extra traffic lights and lane closures until completion in the new year.
The A43/A5 roundabout in Towcester will be altered over the next three months to help ease congestion and improve journey times.
But from Monday, 24 hour traffic management will be in place with overnight lane closures between 8pm and 6am on all approaches and exit roads from the roundabout.
All approaches and exits roads will be narrowed during the day with a 50mph speed limit in place with diversions set up and clearly signposted.
Alastair Warnes, project sponsor for the scheme, said: “While work is ongoing, it is important that road users comply with the traffic management that is in place.
“This is necessary for the safety of our road workers and motorists.
“Once the scheme is completed road users can expect shorter and safer journeys.”
The roadworks are part of a £317 million pinch point improvement programme designed to boost local economies, reduce congestion and improve safety on the strategic road network in England.
It is part of the government’s growth initiative, outlined during the Chancellor’s Autumn Statement in November 2011.