The decision on whether to grant permission for a new £300m rail freight terminal in Herts is to be revealed.
The Radlett Aerodrome site is near Park Street and London Colney
Helioslough wants to build the giant terminal near Radlett but St Albans District Council put off making the decision last November.
People living near the former aerodrome site have been campaigning against the project and have pledged to continue.
Laurence Chester, from the campaign group, said he hoped the project would be refused by planners.
Councillors called for an impact report from the council's highways department after residents claimed it would create more traffic, noise, dust and light pollution.
Campaigners claim that the project would create one million vehicle movements a year and a planned bypass would not help to alleviate this.
The developer, Helioslough, hopes to build on 300 acres of land near Park Street village, St Albans.
A bypass for Park Street will form part of the plan for the old airfield site.
Mr Chester said: "We're really hoping it will be refused but if it isn't we will raise as much support as we can to continue the fight."