My school bus had this pole attached to the front bumper area of the bus. It swung out when it stops. This forces kids to walk at least 8 feet (or however wide a bus us) in front of it before crossing.
Yep, they appeared in my school district in the mid-90's. And with it came stop signs that swung out from the side of the bus, overhead escape hatches that could be opened for ventilation, and ejection seats.