Have you ever gotten a jump scare as a crotch rocket passes your window? Did you notice that it was really loud AS they passed you? The pipes don't project forward so it's only people behind you hearing the noise and they're not a danger, unless you really pissed them off.
I already said in another thread. If using your brakes results in jail time the obvious solution is to hit parked cars because that’s “only” a financial punishment.