One protester scaled the ladder blocking the camera that sat on top of a Transport for London van on Rainham Road in east London , in bid to allow cars to pass and avoid the ULEZ charge.
The Mayor is in New York for the UN Climate Ambition Summit - a decision that has attracted criticism due to the 41,412 air miles he and his team will rack up.
GMB general secretary Gary Smith said last month s expansion of the £12.50 daily fee was worrying workers already being hammered by the cost-of-living crisis.
As our cities are becoming more congested by both residents and passenger cars, local authorities are looking at options to make life better and healthie.