The Red, Amber, Green of the Apple menu beads behave nothing like traffic lights.
Red = Vanish (to where?).
Amber = Vanish (to the bottom of the screen...) Then hunt for where it went.
Green = Expand or Collapse the Window (sometimes as each window behaves differently).
Red = STOP
Amber = WAIT
Green = GO
Mac OS lost the plot a few years back and hasn't yet recovered. It's at the, er, Amber light of GUI design.