Plans to build a new A14 toll road have been published by The Highways Agency.
The £1.5 billion scheme will include a range of improvements between Cambridge and Huntingdon.
Work on the 22-mile route is due to start in 2016 and will include a new 12-mile bypass around Huntingdon.
The changes include:
A new 12 mile tolled Huntingdon Southern Bypass, with junctions at Ellington, at Brampton (where the A14 would meet the A1), at Godmanchester, and on the existing A14 at Swavesey.
The A14 through Huntingdon would be de-trunked. The A14 viaduct over the mainline railway in Huntingdon would be demolished, enabling the existing A14 to be tied into local roads, greatly improving traffic flows in the town and accessing sites for possible new development.
The A14 will be widened from Swavesey to Milton (the section between Girton Interchange and Histon will be widened earlier as part of a separate improvement scheme. Work is due to start in early 2014).
A new single carriageway access road will be built alongside the improved A14 between Fen Drayton and Girton and is intended for local use.
Girton and Milton junctions will be upgraded to improve traffic flow and to add more capacity, with improvements to other junctions along the route
Two new junctions will be constructed at Bar Hill and Swavesey to maintain existing access to the trunk road and to connect with the new local road network
The A1 will be widened between Brampton and Alconbury in order to provide the additional capacity needed to cope with traffic linking to the A1 from the new Huntingdon Southern Bypass.
A public consultation will run from Monday 9 September to Sunday 13 October.
Stephen Hammond, Roads Minister, said: “This announcement meets the commitment I made in January to present a more detailed solution for the A14 and a clearer timetable for delivering these crucial improvements.
“We need a long-term resolution, that will tackle the congestion and journey time reliability issues, and subject to the outcome of the consultation, we believe this is it.
"It’s the best option for people living locally, and for the businesses that see it as a gateway to international markets via the ports on the East coast. It will provide better journeys for long-distance and local traffic, putting the right vehicles on the right roads.”