A scheme to build a £300m rail freight depot at the site of a former aerodrome could create up to 3,000 jobs.
Helioslough, the developers, is hoping to build the huge interchange on 250 acres of land at Radlett Aerodrome, near Park Street village, St Albans.
The scheme, which has not yet been submitted as a formal planning application, goes on public display on Thursday in St Albans.
A bypass for Park Street will form part of the plan for the old airfield site.
A spokesman for Helioslough told BBC News that once it is fully operation about 3,000 workers will be employed at the site, but due to the 24-hour shifts only 1,000 workers would be there at any one time.
'Plan could reduce traffic'
"It's not just Radlett, it's Park Street, it's Frogmore, it's London Colney, it's St Albans. This will urbanise that whole area which at the moment is greenbelt."
Simon Hoare, of Helioslough, said without the new rail freight depot, Park Street will be suffering 14,000 vehicles per day within the next five years.
"An awful lot of traffic which is using Park Street, doesn't actually need to get to Park Street, it's just using it as a rat run," he said.
"Our studies show that we can reduce traffic on Park Street, and that is congestion and emissions and quality of life and local environment, down to 2,000 vehicles a day, so that's a very substantial cut."
The plans are expected to go before St Albans Council at a later date.
