11. Section 147D of the Principal Act is repealed and the following section substituted:
“147D. A person shall not, knowingly and without lawful authority—
(a) tamper or interfere with, or damage the mechanism of an amphometer or an approved radar speed measuring device; or
(b) tamper or interfere with a seal affixed to an amphometer or an approved radar speed measuring device.
Penalty: $1,000.”.