The Highways Agency has published its plans for improving the A14 between Cambridge and Huntingdon.
The Government last year backed down from making the improved road a toll route after Suffolk businesses and MPs campaigned against it, calling it a tax on commerce in the east.
The agency began a 10 week consultation period on Monday by publishing its plans on its website at www.highways.gov.uk and people have until June 15 to express their views.
The £1.5 billion scheme starts at Ellington, on the existing A14 to the west of Huntingdon, and extends to the Milton junction on the Cambridge Northern Bypass.
It includes widening existing sections of the A14 and A1 and a new Huntingdon bypass to ease the flow of 85,000 vehicles a day.
There are two proposed routes. One has the new bypass as an east-west route and retains the existing A14 as an east-north route, but that would need upgrading in 10 to 15 years. The other completely replaces the existing road.
Work would start in 2016 to be completed by 2020.