FOI release

Gatsometer Type 24+AUS and photogrammetry

We received the following Freedom of Information request on 25 January 2011 regarding the Gatsometer Type24+AUS and the use of the science of…

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We received the following Freedom of Information request on 25 January 2011 regarding the Gatsometer Type24+AUS and the use of the science of photogrammetry.

  1. What Home Office, Police or manufacturer’s guidelines are followed when performing the secondary check on a set of photographs made by a Gatsometer type 24+AUS speed camera?
  2. What are the legally acceptable methods used to perform the secondary check?
  3. Might a person trained and experienced in the science of photogrammetry (a photogrammetrist) perform a secondary check on a set of Gatsometer photographs?
  4. What are the minimum levels of training and qualification recommended by the Home Office or the police for a person carrying out such a secondary check on a set of Gatsometer photographs?

We released the following information on 22 February 2011.

  1.  No secondary check instructions are issued by the manufacturer or the Home Office.  The operating authority is responsible for the training of its operatives in the appropriate methods for performing a secondary check.
  2. The Gatsometer Type 24+AUS has been approved using a secondary check based on two images taken a known time interval apart.  It was originally approved using photogrammetry but subsequently the Home Office agreed to the alternative use of a scale marking down the road, as it is less labour intensive and more easily understood by the courts.
  3. Persons trained and experienced in the use of photogrammetry may perform a secondary check for the Gatsometer Type 24+AUS. This device was originally approved with photogrammetry. 
  4. The Home Office does not set training requirements. Training of officials is a matter for the operating authority.