Interesting development on speed cameras - as if we didn't know

[cheshirecat]

Speed camera cause accidents (http://www.dailymail.co.uk/news/article-2029361/Speed-cameras-cut-accidents--create-study-finds.html)

[Berries]

I remember seeing a graph years ago that showed measured vehicle speeds around a fixed speed camera. Flat line, then a drop at the speed camera, a rise after passing the camera and then another flat line. The problem was that the flat line after the speed camera was actually higher than the flat line leading up to it. Not good if the camera is placed prior to an intersection for example.

Originally most speed cameras were placed at areas with a crash history, and it was easy to measure whether crashes had reduced and then try and show that the camera had some affect, which was a bit harder. So many sites now though don't seem to have been through the same selection process so you can't measure site specific crash savings.

[SPman]

http://www.policespeedcameras.info/studies.html

http://www.aussiespeedingfines.com/pages/About-Traffic-Fines.html