They may have had to poop.

Always give the benefit of the doubt to the amber lamps.

You don't have to pull over for amber lights. They're primarily there for visibility and to alert you to the fact that they may be working/towing/stopping frequently/etc.

OP is talking about amber lamps on private vehicles, aka hazard lights. You are correct in that you still don't have to pull over, but if someone has them on and is trying to pass, I'm going to let them. You never know what their situation is.

I have no idea why this is getting downvoted lol

"Someone came up behind me clearly in some sort of emergency, but I didn't let them pass because their blinking lights were the wrong color" would definitely be peak Masshole decision making.

If it's not blue or red, you can ignore it if you want. Personally, if it's clear they're trying to get somewhere ASAP, I'd let them pass. You never know what you might have just helped them with.

First, amber lights like you'd see on a tow truck or plow truck have no legal weight whatsoever. If they aren't blue or red, you don't have to move.

On the other hand, where were you when he flashed his high beams? If you were in the left lane of a divided highway, move over regardless.

Single lane in a town center.

In that case you should have rolled your window down and flipped him off.

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It's the law here in MA...

Was it lettered? Feel free to drop a dime on them. Worst that can happen is they say it was an emergency.