"Fill the Boot" is pretty common, normally traffic patterns aren't interrupted and they set up plenty of warnings about it.

I wouldn't call it liberal or conservative idiocy, as idiocy runs across the spectrum when you get some idiot who suddenly decides to enforce a rule that has been ignored.

(strictly speaking, it would be conservative idiocy, as for better or worse conservatives are normally the ones who push for enforcement of existing laws, liberal would be allowing a practice that went against the letter of the law to continue......as in a liberal interpretation of a rule.)