Information about the casualty data published on this web site

- The 3-year 'before' period used in these figures is not necessarily the same period used to make the decision to install a camera. For example, the actual period used to select a site which was installed in 2002 might have been June 1999-May 2001, whereas these figures would use January 1999-December 2001. These figures use calendar years for the purpose of consistency.

- An increase in casualties does not necessarily mean an increase in collisions. For example, 1 collision could result in 2 people sustaining injuries one year, but the following year 1 collision could result in injuries being suffered by 6 people.

- Because of the small numbers involved, going from 0 casualties before to 2 casualties after installation of a camera is not indicative of an ineffective camera. Accidents are, by their own definition, unpredictable and open to natural fluctuation in their occurrence.

- These casualty statistics refer to the stretch of road within 1km of the camera housing. This means that collisions could be occurring some distance away from the camera but still within the given boundary, rather than at the exact location of the safety camera.