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Question about something on the Bus Ceiling

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I was wondering, what is this for and what the Red/Green(In the box!) Lights mean?


How does it detect people going under it, seeing the light turns green(or red i think, forgot)?


Is it to alert people not to stand in the rear door stairwell and causes the bus to halt? Just curious!





Edited by mark1447
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That boxy thing warns people not to stand in the rear doorwell, but that's all. It can't stop the bus from moving.


How does it detect people tho?


And when i mean halt the bus i mean, it kinda turns the A/C off and the motors and then the woman comes out saying "Please do not stand in the rear stairwell"

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