A stop sign on a main arterial road that has no business being there. It's called that because some broken condom of a Soccer Mom chose to take their own life by getting run over by a car. It exists because of society's tendency to place higher values on some homo sapiens than others, without taking merit into account.
Royalty stops are what happens when people make decisions based on emotions.
"Dude, did you just pass that stop sign?" "It's a royalty stop"