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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.