Actually your opinion could mean something...
Originally Posted by nailedagain
75 Pa. C. S. § 3368. Speed timing devices. PA TicketInformationTitle 75 PA Statutes- Vehicle Code
(e) DISTANCE REQUIREMENTS FOR USE OF MECHANICAL, ELECTRICAL AND ELECTRONIC DEVICES.-- Mechanical, electrical or electronic devices may not be used to time the rate of speed of vehicles within 500 feet after a speed limit sign indicating a decrease of speed
This limitation on the use of speed timing devices shall not apply to speed limit signs indicating school zones, bridge and elevated structure speed limits, hazardous grade speed limits and work zone speed limits.
and just so we're sure that radar is an "electronic device"...
(2) Except as otherwise provided in paragraph (3), electronic devices such as radio-microwave devices
(commonly referred to as electronic speed meters or radar) may be used only by members of the Pennsylvania State Police.
Your ticket should include the location of the alleged offense. If it is irrefutably within 500 feet after the speed sign, you could have a case, or even if it's somewhat questionable it could raise a reasonable doubt.