The road is an all-new 6.5km dual carriageway, linking Corby and the A14, relieving the A43 at Geddington, a village that has campaigned for this scheme for many years.
Site preparation works are under way, with the main contract due to start in July. Completion and road opening are expected in early 2014.
The scheme will involve the construction of three new bridges, as well as 6.5km of road. Where it crosses a valley Interserve will accommodate the watercourse beneath it in a box culvert.
Extensive earthworks and piling will be required, with cuttings and embankments up to 10m deep and 8m high. Interserve said that it would use local resources wherever possible and, in accordance with the council's requirements to protect endangered species, will translocate bluebells and ancient hedgerows.
The route will connect the existing A43 near the village of Stanion to the A6003 near Barford Bridge, north-west of Kettering and will improve the link between the north of the county and the A14.
Total project cost is £34m, with £20.6m coming from central government.
Interserve executive director David Paterson said: "The A43 Corby Link Road will benefit both the local community and through traffic. The project will showcase our expertise in major civil works and our commitment to delivering such extensive developments sustainably. Our major projects team will work with local suppliers to achieve this."