The FPB believes that the congestion charge would be a disproportionate tax that most small firms would struggle to pay. In addition, the FPB is alarmed that, although Hackney cabs will be exempt, other vehicles, such as private hire taxis, could be hit.

"It's absolutely disgraceful," said FPB member Tony Price of Yellow Cabs, Chorley. "We're both providing a public service, so I don't see why hackney cabs are being let off yet private hire vehicles will still be charged."

Mr Price added: "Any extra charge would have to be added to the customer's bill." The FPB believes that, with fuel prices still surging, this extra tax is unwelcome and a further exemptions should be guaranteed for all small businesses.

According to AGMA, surveys suggest that hauliers will actually save money through the congestion charge. The FPB, which has been unable to obtain the results of the survey, is questioning how this translates in practice.

"Stuff it! This will be absolutely disastrous and is a particularly poor idea that is going to make it harder for us to make a living," said Dominic Paul of Dreamway Ltd in Manchester. "This extra tax seems pointless, as with the rising cost of fuel and dwindling supplies of oil, there will be fewer cars on the road in five years' time."

So far during the consultation process, there has not been an inadequate voice to represent the opinion of smaller firms. The FPB is calling on the owners of small businesses who would be affected by the congestion charge to sign its petition at www.fpb.org/manchestercongestion.

Geoff Dossetter, Director of External Affairs at the Freight Transport Association (FTA), is calling on AGMA to give small businesses a break.

"We need evidence that the congestion charge scheme is required in Manchester," he said. "Commercial vehicles should be exempt from all charges because this just creates a further burden on them. Commercial vehicles are not driving into the city centre for fun; they have to go there."