Campaign group Save Sloane Square, which is drawing up a rival scheme, said figures released by Transport for London (TfL) showed that the proposed plans could 'quadruple' traffic in the mornings.
Stanton Williams' scheme has been rumbling on for more than two years, and has been vehemently opposed by the Save Sloane Square group, which has a number of high profile supporters such as Brian Ferry and Lord St John of Fawsley.
The group drummed up a petition, handed to the Royal Borough of Kensington and Chelsea, which is thought to have listed more than 4,000 names who oppose the revamp.
Despite this, the £5.5 million scheme has the full support of CABE and was even given backing by 78 per cent of the public who looked at the proposed project.
The development is part of Mayor Ken Livingstone's faltering 100 Public Spaces initiative, and aims to increase pedestrian spaces by 50 per cent while reducing traffic substantially.
A final decision on the scheme is likely to be made next year.