Anyway there won't by any "change" in the rules (as there are no fixed rules): for me the "too background cars" were never "allowed", it is just that for some time nobody was really saying anything about them (except me sometimes, and I was just not listened )
It should rather be a reminder of what has its place on the site and what has not. The question is what to do, as not all members/admins have the same point of view about that?