FOI Response: Congestion Charge Cameras

Our ref: TFL 052809

20 October 2006

Dear Ms Brooke

FOIA Request for data on operation of Congestion Charge

Further to my letter of 18 October, I am pleased to disclose our response to questions

1 to 4 from your original letter.

1. The total number of cameras used in relation to the congestion charge itemised as fixed or mobile

There are a total of 198 PTZ colour cameras, 59 fixed colour cameras, and 435 fixed monochrome cameras, all of which are mounted on columns. There are 10 mobile camera units.

2. Location of all fixed cameras

Please see the attached document for a list of camera locations.

3. Hours of individual camera operation.

The cameras are operational 24 hours a day, except for periods of planned maintenance. However, they are only used for enforcement purposes during the congestion charging period.

4. If cameras are operational outside of the congestion charge period, the reason why and related policy or correspondence on the collection of this out-of-hours data

Out of enforcement hours, the monochrome cameras (which do not provide full contextual images) remain operational and provide a data feed of observed Vehicle Registration Marks (VRMs) for congestion monitoring. At no point are images used in this process and the VRM data is anonymised as soon as possible on a daily basis.

Some of the statistical information collated using information collected in this way is published in the Congestion Charging Impacts Monitoring Reports. The Reports are available on our website at:

In addition, it is not possible to automatically turn cameras off and on remotely in the Central London zone. To switch them off and on would require an individual to visit each camera twice a day. This would impose a large cost on the operation of the scheme.I regret that I am not able to provide correspondence or supporting documentation relating to the timing of camera operation at this stage. I anticipate that I will be in a position to disclose this on Friday 27th October. I am sorry that we have not been able to disclose this information at this stage – although the Information Access and Compliance Team only passed us your request on Monday 16th October, I realise that you have been waiting for a considerable time.

More information about the cameras used in the operation of the Congestion Charging Scheme can be found on our website at:

As I mentioned in my letter of 18 October, we intend to provide you with a list of FOIA requests received by Congestion Charging since 1 January 2005 and the information already disclosed by Congestion Charging by Friday 27th October.

TfL’s central Information Access Compliance team (IACT) will handle your request for a TfL-wide list of all FOI requests received since January 2005, and will contact you separately about this.

If you have any queries about this letter please do not hesitate to contact me. And if you are not satisfied with the handling of your request, please read the attached sheet entitled Your Right to Appeal

Yours sincerely

Sean Grace

Freedom of Information officer, Congestion Charging

Direct line: 020 7126 4596

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