What is the minimum visibility requirement for the use of strobe lights on school buses?

Answer: C — 500 feet

The minimum visibility requirement for the use of strobe lights on school buses is 500 feet. This requirement is established to ensure that other drivers can see the school bus from a sufficient distance, particularly as it is picking up or dropping off children. The strobe light serves as a warning sign to alert drivers to the presence of a school bus, which helps promote safety for students who might be entering or exiting the bus. Being visible at this range allows for better reaction time for drivers approaching the bus, reducing the risk of accidents in the immediate vicinity of school bus stops.