Fears have been raised that speed cameras need to be placed on a road used by NDR rat-runners soon - or the cash to pay for the project will disappear.
That is the warning from Costessey Town Council member Gary Blundell, who said the two cameras were the preferred option for West End, Costessey, a popular shortcut for motorists driving from the new road to the A47.
Mr Blundell added that the town council, Norfolk County Council and residents wanted the average speed cameras but was disheartened that Norfolk Police were opposed to the idea.
He said: "A lot of places are using average speed cameras because they are a good deterrent."
He said the money needed for the technology was available - around £300,000 from central government and just over £60,000 section 106 money from Next Home store on Costessey's Longwater Retail Park.
The store opened in 2010 and Mr Blundell said there was a risk the cash could be returned to Next if not used.
He added: "A decision needs to be made soon. We came up with an idea to stop speeding at no cost to the police. Speeding has always been an issue on West End but since the NDR was built it has got worse. Most residents feel it is dangerous. Just because accidents have not happened that doesn't mean they wont."
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