作者: Timothy C. Jackson , Jeffrey G. Parks
DOI:
关键词: Signal 、 Transmitter 、 Radio receiver 、 Telecommunications 、 Short distance 、 Mile 、 Engineering 、 School bus
摘要: A system for alerting school children that a bus is moving toward nearby stop, thus prompting the to leave their residences reach stop at or before arrives stop. The includes radio transmitter on and receiver in each home along route. Each has first warning light begins emit signal when relatively great distance away from home, second sound-emitting speaker an audible short e.g. one quarter mile.