Question When should alternating flashing amber warning lights be activated? Answers When a bus is within 10 feet of a bus stop When a bus is about 50 feet from a bus stop When a bus is at least 300 feet from a bus stop When a bus is 1,000 feet from a bus stop Explanation 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. Take a FREE Practice Test Now