These are arranged in order and do reference each other.
So, here's what happened. The traffic management team at the DOT was meeting. These are the folks who invented rotaries, exit ramps that occur right after entrance ramps and signs that say "watch for falling rocks".
What most people don't know, but should suspect, is that these people are heavy drug users.
To get started they smoke some dope and then do a few lines of coke to get sufficiently amped for the job of confusing all the motorists in the United States. Frank, whose been on the team longer than anyone else and is known for his flashes of brilliance; like the time he thought of signing four way intersections with yield signs on every corner, gets that inspired look in his eye. "What if we make a sign that has both a stop sign and a go arrow on it, won't that fuck them up". Everyone thinks it's a great idea but extreme. Frank persists and now we have a sign that graphically represents one of the most compelling paradoxes of human life- how do I stop and go at the same time?