From: Nate Nagel on
http://www.washingtonexaminer.com/local/Driver-finds-loophole-in-speed-camera-ticket-92551709.html

The story I heard on the radio stated that an engineering survey of the
speed limit was required periodically (every 5 years?) although the
written article that I could find did not explicitly state that.

nate

--
replace "roosters" with "cox" to reply.
http://members.cox.net/njnagel