Transport for London has also slightly modified the area to be extended as well as widening the residents' discount area to include some of those living just outside the expanded charge area.
TfL has proposed extending the charge area and is now consulting on its planned changes to the original extension plans. The extended area could be in operation by February 2007.
Under the revised scheme, the congestion area will not go quite as far west into the Earl's Court area as first proposed, nor as far north into Kensal Green.
TfL reckons that congestion in the extended zone will be reduced by 15-20 per cnet. Net revenues from the extension are expected to be around £30-50 million a year and this money would be spent on further transport improvements in London.