The new Corby link road will open to the public on Friday, May 23.
And a cavalcade of vehicles representing Northamptonshire will mark the opening.
The procession will include the Corby-based Bluebird high speed electric vehicle, a procession of HGVs from county firms, emergency vehicles and the Geddington Volunteer Fire Brigade fire engine.
The four-mile dual carriageway connects the existing A43 near Stanion to the A6003 near Barford Bridge, north-west of Kettering.
As well as improving the link between the north of the county and the A14 it is hoped the road will also reduce congestion on other local roads and improve road safety, particularly in Geddington.
Council leader Cllr Jim Harker said: “This was a much-needed scheme and I’m delighted to be able to announce that we’re now ready to open it to the public.
“As a county council we are committed to laying the foundations to facilitate economic growth and I see this scheme as essential to unlocking development in Corby and the surrounding area.
“It’s remarkable that the road is opening right on schedule considering all the very wet weather we’ve been experiencing in the time it was being built.
“I’d like to thank all of the workforce for their terrific effort over the past two years and the harsh weather they’ve battled with to get this open on time.
“I’d also like to thank the many people over the past 40 years who have pushed for a scheme like this.
“It is not only a vital economic link but also a desperately needed bypass for Geddington, which relieves that village of the thousands of vehicles which have thundered along the A43 for the past three decades.”
Roads Minister Robert Goodwill, who will open the road on Friday, said: “The government has contributed £20.6m to improving the A43, which will not only ease congestion in and around nearby rural villages but also help support local businesses and the economy.”
The work was carried out by Interserve Construction Limited, the international support services and construction group.
Interserve director Simon Ohlenschlager said: “We are delighted to have been given this opportunity to work collaboratively with the council and their design partner MGWSP.
“We are pleased that Interserve has been able to contribute in a small way to the local economy and employment.
“We must also thank the local residents and travelling public for being patient with the day to day challenges that such a major construction brings. I congratulate the whole team on a job well done.”
The government has contributed £20.594m, with the council being responsible for funding the remainder of the £34m scheme.