The A45 Flore/Weedon Bypass is a key infrastructure project to relieve traffic on local villages and enable Daventry's future growth.
The council approved entering into a funding agreement last month with Northamptonshire County Council to help deliver the project.
Construction is expected to start this autumn after the council's Development Control Committee approved the planning application for the scheme on 16 June.
The 3.5 mile single carriageway link road will start at a new roundabout on the A45 between Dodford and Weedon.
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The route will then pass north of Weedon, Flore and Upper Heyford before rejoining the A45 at a new roundabout between Upper Heyford and the M1 at Junction 16.
It is anticipated the road will open in June 2017.
Council leader Chris Millar said the council was 'delighted' with the decision to grant planning permission.
He added: "It will relieve traffic in the villages it bypasses and is absolutely key to the sustainable future growth of Daventry. It will also improve links between Daventry, the M1 and Northampton and assist in attracting further inward investment.
"After many years of work everything is now in place to deliver this project and we look forward to construction starting later this year."
The council is expected to invest over £20 million in the scheme from the New Homes Bonus along with developer contributions including the Community Infrastructure Levy (CIL).
Most of the remaining projects estimated cost will come from the Local Growth Fund.
(LM)
