Plans have gone in to build 175 new homes between Truro and Threemilestone.
Barratt Homes plan to build the houses at Higher Besore, located just behind Truro College and just off the A390.
There are concerns that with the road already struggling to cope with the volume of traffic, the building of more homes in the area could spell traffic chaos and potential gridlock.
Tim Deeble, Cornwall Council member for Threemilestone and Gloweth, has called for improvements to be made to the A390 if the plans go ahead.
He said: “Local residents are already well aware of the fact that the A390 struggles with the volume of traffic.
“At the moment it just about copes, but further developments in the area would call for a co-ordinated plan on road improvement.
“The road hasn’t been altered in 20 to 30 years and if these new homes were to go-ahead along with other already approved developments, road widening could be necessary.”
Of the 175 new developments 70 would be potentially affordable housing, with 105 available on the open market.
In addition to the new houses, there would also be 315 parking spaces created.
Alongside the proposed new homes in the area are several other developments that have already been given the green light.
Planning permission has already been given for 1,500 new homes, a new primary school and an extension to the current park and ride at Langarth, as well as Cornwall’s first Holiday Inn and a further 93 homes across the road.
Also nearby, Taylor Wimpey are currently building 226 new homes at the former Richard Lander school site at Highertown.
Among the local residents alarmed by the plans of development in the area is Sylvia Gill, who expressed her reservations on the Cornwall Council website.
She said: “My concern is that the present road structure (Truro to Chiverton Cross Roundabout) cannot cope efficiently with the present amount of traffic, so how on earth will it cope with the traffic from yet another building development?
“The traffic will increase with the development of the old Richard Lander site and to build even more houses is absolutely ridiculous without the infrastructure to support it.”
The Barratt Homes planning document states that they believe that the new houses will ease traffic in Truro and by building properties for people who work in the area to live in, it will actually decrease the number of people who commute in for work.