The dragon is the friends we made along the way.

Flashing green is Massachusetts only and pretty rare nowadays (there were a lot more of them when I was a kid).

It means caution, and that the light may go to red and yellow (another MA exclusive) if somebody presses a walk button. Red and yellow simultaneously means a pedestrian light. When I was taking drivers ed that meant you couldn’t drive across a crosswalk when red and yellow was on. No right on red (this predates that) and you stop even if you are in the middle of the intersection (so you don’t cross a crosswalk). I haven’t seen a red and yellow in a few years though, so maybe they don’t do them any more.