Work has started on improvements to the A5/A45 crossroads in Weedon.
The changes for the crossroads started on Monday and will see a widening of lanes to improve journey times and ease congestion.
It will cost £950,000 and has been funded by the Government’s growing places fund, which is designed to help push forward housing and economic growth.
Leader of Northamptonshire County Council, Cllr Jim Harker, said: “This is good news for the county.
“This is one of the most important junctions in Northamptonshire and anything that can be done to improve the safety on the crossroads needs to be carried out.
“In addition it also supports economic growth in the Daventry area, which has to be welcomed, particularly as the UK economy moves into recovery.”
However, Cllr Harker added the start of the improvement work will not have an effect on the planned bypass for the area.
He added: “It in no way diminishes, however, the need for the Flore, Weedon, Nether Heyford bypass and the council is working hard to bring this major scheme forward as quickly as possible.
“The Growing Places Fund was established for schemes such as this and I’m delighted that we’re seeing results, right here in Northamptonshire.”
The work will take around 12 weeks and includes extending the carriageway, creating additional lanes and installing smart traffic lights to improve traffic flows.
Chairman of Weedon Bec Parish Council Stuart Jacks said: “We’re looking at 12 weeks of work starting with very little notice.
“We will have to deal with the short term inconvenience but we hope it will alleviate some of the congesion on the junction.”