Around here in south eastern Pennsylvania, some truckers tend to abuse the use of their Jake Brakes. I guess an empty
flat bed at 2 am down shifting thru 5 gears with a straight pipe is cool in some circles. This has caused local municaipalities to post signs that say "Brake Retarders Prohibited With In City,Town,Borough Limits" .
I'm sure that the most inexperienced truck driver wouldn't install a device that would retard the the brake system on their 80,000 lb rig.
All permitted loads also require an "Engine Brake" And are required to use them.
If you were cited for using an engine brake within town limits, I can't see how a judge could uphold that charge.
Russ