The A14 links Felixstowe docks to the Midlands and suffers severe congestion. But the Treasury last year scrapped the proposed widening between Ellington and Fen Ditton - where the road lies near to major housing developments in Northstowe, Waterbeach and Alconbury - as "simply unaffordable under any reasonable future funding scenario".
However, this week's Autumn Statement says the government "will explore innovative ways of financing this work, including tolls".
A Department for Transport spokesman said options including shadow tolls - where a contractor is paid according to the number of passing vehicles - and physical booths would be considered.
Matthew Lugg, president of the Association of Directors of Environment, Economy, Planning and Transportation, said: "The A14 is a massive bottleneck."
Work on 10,000 proposed homes at Northstowe stalled when the recession began.
Paul Kitson, area manager for housing and regeneration quango the Homes & Communities Agency, which promotes Northstowe with partner Gallagher Estates, said: "We remain confident that Northstowe can be delivered."