Five years of the congestion zone

November 2003: Mayor Ken Livingstone reveals plan to double the size of the zone, taking its western boundary to Shepherd's Bush and southern boundary to Chelsea Embankment.

February 2004: Transport for London starts a public consultation over the expansion, despite transport commissioner Bob Kiley voicing his doubts about its effectiveness.

August 2004: Consultation reports majority of residents are opposed to the extension, however the recently re-elected Ken Livingstone calls the findings a "charade" and says he will proceed with the scheme.

July 2005: Daily charge rises from £5 to £8 as thousands of businesses and residents continue to protest against the extension.

September 2005: Official announcement that the western extension will come into effect on 19 February 2007.

June 2006: Renewed opposition to the extension as official report shows congestion in the existing zone is now worse than when the scheme started.

February 2007: Western extension becomes operational, costing £123million to implement.

January 2008: Boris Johnson pledges to scrap the extended congestion zone if he is elected Mayor.

November 2008: Mayor Johnson scraps the scheme after new public consultation finds overwhelming opposition.