Plans for 166 new homes on the edge of Hunstanton could cause more crashes on nearby roads if they are not changed, highways chiefs say.
The claim was made in a Norfolk County Council letter, published on Friday, objecting to the Hopkins Homes scheme.
Opponents have criticised the plan for an access road, which would force drivers to get on and off the site from Hunstanton Road, Heacham.
And principal engineer David Higgins argued the plan was “unnecessary”, adding that the development should be linked to the Manorfields estate instead.
He also pointed out the developers’ own figures showed the number of drivers turning right from Hunstanton Road onto the A149 was expected to soar from one to 37 during morning peak time and from two to 20 in the afternoon.
He wrote: “The Highway Authority is concerned these additional turning manoeuvres will significantly increase the potential for accidents at this junction, which already has an accident history.”
But the developer says it wants the current 40 miles per hour speed limit on the A149 extended to include the junction.
It also proposes cutting the Hunstanton Road limit from 40 to 30 miles per hour, adding: “This will be discussed further with NCC, as part of the post-planning work.”
The company also claims 60 per cent of vehicles will travel to or from destinations south of the site, compared to just 37 per cent locally or into Hunstanton itself.