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Inthis paper, we present a detailed statistical analysis of the effects of speed limit enforcement cameras on injury,accident numbers. The approach used is constructed in such,a way,that it is possible to differentiate not only between,the effects of the camera,and the effects of trend and seasonality, but  to  actually  produce  estimates  that  are  independent  of  any  other  overall  time- dependent effects. Crucially, the estimates produced are also net of the effects of regression to the mean.  In  order  to  allow  for  the  simultaneous  treatment  of  the  different  levels  of  severity,  weights are used that reflect the frequency of the different types of accidents. This approach is then used on a data set for all injury accidents in Cambridgeshire between 1990 and 2002, which also contains  data  from  49  camera-sites.  In  order  to  quantify  the  range  of  effectiveness  of  the  cameras, estimates of the changes in accident numbers are produced for different distances from the camera-site. The analysis shows that overall, inthe immediate vicinity of the camera-site, the installation of a camera can be expected to lead to decreases in weighted injury accident numbers byan astounding  45.74%.  Lower,  but  still  significant  decreases  are  observed  in  the  wider

Analysis of the Effects of Speed Limit Enforcement Cameras: Differentiation by Road Type and Catchment Area