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supersparks said:oh and the bit about speed cameras is untrue, a couple i know of in 40mph zones are set at 42mph
so many have peen caught that most slow down to 29mph just in case as they go by
Are they gatsometer type cameras?
Read this ... http://www.devon-cornwall.police.uk/dcsc/enfotech/gatso.htm
Type approval for Gatsometers ...
Primary (radar) to be within ± 2 mph of actual speed up to 60 mph and ± 2% for speeds above 60 mph.
Secondary (camera) to be within 10% of primary.
So, 40 mph + 2 = 42mph 10%= approx 4 mph therefore less than 46 mph would be arguable due to the machine tolerances.
But, if you notice among the Devon-Corwall writings, the flash time delay between shots is variable 0.5 sec to 0.7 sec ... I believe this can be 'tweaked' by the operatior..... can of worms??
The quoted margin for error may not exist with other types of device.
See how a calibration certificate looks ..
http://lbsafetycameras.co.uk/articles.php?frmArticleID=20&staticId=54
Not much detail on the Gatsometer cert.
More detail to be seen on others.