electrical and electronic devices.--The department may, by
regulation, classify specific devices as being mechanical,
electrical or electronic. All mechanical, electrical or
electronic devices shall be of a type approved by the
department, which shall appoint stations for calibrating and
testing the devices and may prescribe regulations as to the
manner in which calibrations and tests shall be made. The
certification and calibration of electronic devices under
subsection (c)(3) shall also include the certification and
calibration of all equipment, timing strips and other devices
which are actually used with the particular electronic device
being certified and calibrated. Electronic devices commonly
referred to as electronic speed meters or radar shall have been
tested for accuracy within a period of one year prior to the
alleged violation. Other devices shall have been tested for
accuracy within a period of 60 days prior to the alleged
violation. A certificate from the station showing that the
calibration and test were made within the required period and
that the device was accurate shall be competent and prima facie
evidence of those facts in every proceeding in which a violation
of this title is charged. A device under subsection (c)(6) must
be calibrated and tested every 365 days at a minimum before
being used.
(e) Distance requirements for use of mechanical, electrical
and electronic devices.--Mechanical, electrical or electronic
devices or light detection and ranging 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
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