Vehicles Seen in the Congestion Charge Zone by Month

Vehicles seen in the Congestion Charge Zone by month since July 2010. Total number of unique vehicles seen in the Congestion Charge Zone during charging hours. The count is of unique vehicles per day which are added up to provide the number in the month. This means if the same car is seen more than once on a single day, it is only counted once. Drop from Jan 2011 is due to removal of Western Extension. Monthly fluctuations are as a direct result of the number of Congestion Charging days each month and seasonal trends (i.e. school holidays).