Change the announcement to a loud buzzer. The kind you hear at
NTUC. Use three senors. One at front, middle (near exit door), and
rear.
If rear (right at the end) sensor empty but front or/and middle
sensor detects people loud buzzer goes off, tells people to move,
and doors refuse to close.
Like where the elevator gets overloaded, and you need that loud
buzzer and somebody must get off regardless.
"You have a selection. Either move to the rear, or off the
bus"
