I like the speed limit metaphor.
Have you ever been on a road you have never been down before. You don't know what the speed limit is. There are people behind you. Are you going too fast? Areyou going too slow? Are you going to get a ticket? Are you being reckless? Are you obstructing traffic? Are you holding people up?
And then how much of a relief it is to finally see a sign telling you what you should be doing.