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When should alternating flashing amber warning lights be activated?

A When a bus is at least 300 feet from a bus stop
Explaination
The driver of a school bus must activate their amber warning lights at least 300 feet before reaching a bus stop to warn surrounding drivers about the upcoming stop.
B When a bus is within 10 feet of a bus stop
C When a bus is about 50 feet from a bus stop
D When a bus is 1,000 feet from a bus stop