Assertion: school bus's stop arm | /r/HasProperty | retracted
Facets:
Source sentences:
text: Oncoming traffic and motorists approaching the bus from behind may not move until the stop arm is retracted and the red lights are no longer flashing.
text: You must not proceed until the red lights have stopped flashing, and the stop arm has been retracted, then proceed cautiously.
text: Oncoming traffic and motorists approaching the bus from behind may not move until the stop arm is retracted and the red lights are no longer flashing.