Since 2011, certain data relating to fixed speed cameras in many parts of England has been available to the public in the interests of transparency. Analysis of these data can provide estimates of changes in numbers of collisions and casualties in the vicinity of cameras, typically on between 0.4 km and 1.5 km of road, and in the speed of traffic there, following the establishment of cameras. This technical report, introduced by an explanatory note, discusses a number of ways in which the data can be analysed, and provides for users of the data practical advice on the scope and nature of the available data and on their analysis and interpretation. Comments are made on lessons to be learnt from the making available of the data. Results of a range of example analyses are presented in the Appendices. (Author/publisher)
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