The controversial £178.5m Norwich Northern Distributor Road should be scrapped, campaigners have said.
The cost of the 12.5 mile road, which would stretch from the A47 at Postwick to the A1067 Fakenham Road, has escalated by £30m, Norfolk County Council bosses revealed earlier this month.
The government has agreed to put forward £10m and the New Anglia Local Enterprise Partnership board could stump up a further £10m.
But the final £10m would have to come from the county council's transport budget, with councillors set to be asked to agree the move at an extraordinary meeting next Wednesday.
However, the Campaign for Better Transport and Green county councillor Andrew Boswell, have called for the plug to be pulled on the project.
Sian Berry, from the Campaign for Better Transport's sustainable transport campaigner, said the road was 'unnecessary', while Mr Boswell said: 'Norfolk County Council, the New Anglia Local Enterprise Partnership and the government are spineless to roll over and accept a 20 per cent hike in project costs in just two years rather than seeking to renegotiate the contract.'
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