Sorry, Massachusetts riders:
No motor vehicle so operated shall mount or display a flashing, rotating or oscillating light in any direction...
-MGL, TitleXIV, Chapter 90, section 7.
I realize this is for
while driving (same deal for undercarriage lights) and they should be fine while parked on display. I also realize that folks will probably write in and say "I drove right past a cop in MA with these on and he didn't say anything!" like anytime we have a legal discussion here...
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Crap. There goes my grand plan.