I would go so far as to say that it's dangerous to drive what the speed limit is supposed to be, if everyone else is driving 15-30 miles an hour faster than you

I would go so far as to say that it's dangerous to drive what the speed limit is supposed to be, if everyone else is driving 15-30 miles an hour faster than you. Which also highlights one of the inherent flaws with laws and rules like speed limits. They don't ever actually mean, drive at this velocity. They always mean, drive at a safe speed and here is the number we all collectively agree on, unless we don't.