Electronic signs warning of the depth of floodwater on the Welney Wash causeway are to be installed within the next fortnight.
The signs have been paid for by Norfolk County Council and Cambridgeshire County Council and are set to be up and running during January.
The signs will give long overdue warnings to motorists about the levels of flooding at Welney, which closed again at the weekend, and advise of alternative routes.
Welney Parish Council clerk Pat Copeman said: 'The posts are already in place; the signs have been manufactured and are now ready to be installed.'
Three signs have been paid for by Norfolk County Council, with one in New Road, Welney, another at Suspension Bridge warning people coming from Ely, and another at Lots Bridge crossroads on the A1101 between Three Holes and Tipps End.
Mrs Copeman said the signs would be controlled by the county highways department – and other signs could follow.
Other signs have been provided by Cambridgeshire County Council who confirmed the work is being undertaken on their behalf by Norfolk highways team.
A Cambridgeshire council spokesman said: 'We have been working with Norfolk and their contractors. The work in Cambridgeshire will be carried out at the same time as the work in Norfolk.'
Total bill for the signs is around £50,000 to be shared between both councils.
Until now flood warning signs have comprised of metal 'flap' type signage merely stating the road is closed but giving no indication of water depth.
Tim Bennett, a Welney parish councillor, said the old style signs were no longer fit for purpose; they often stayed up long after the road re-opened and were prone to vandalism.
NE Cambs MP Steve Barclay said installation was 'great news'.
He said: 'It is important that motorists using this road are fully aware of the levels of flooding at Welney allowing them to make conscious decisions about their safety when using the road.
'This has been a long-standing issue for residents and I am glad that the councils have addressed their concerns.'
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here