Which color lights on a school bus indicate you must stop?

• A. Red
• B. Yellow
• C. Green
• D. Blue

Answer: (A)

School bus signals use color cues to tell drivers exactly what to do. Red lights flashing on a school bus mean you must stop. When you see red lights flashing and the stop arm extended, traffic in both directions must come to a complete stop and you may not proceed until the lights stop flashing and the bus resumes moving. This rule is in place to protect children as they board and disembark. Yellow lights are a warning that the bus is about to stop, so you should slow down and be prepared to stop if the red lights begin flashing. Green lights and blue lights aren’t used as the stop signal in this context, so they don’t indicate that you must stop.