If a school bus's red lights are flashing and the stop arm is extended, what is required of all other vehicles on the roadway?

• A. They may pass carefully.
• B. They must stop and may not proceed until the lights stop flashing and the stop arm withdrawn.
• C. They must slow to 15 mph.
• D. They must honk and proceed.

Answer: (B)

When a school bus has its red lights flashing and the stop arm extended, every other vehicle must stop. This signals that children may be boarding or alighting, so you cannot proceed until the bus turns off its lights and retracts the stop arm. The rule applies to traffic in both directions, and you should remain stopped and out of the path of the bus until it is safe to continue. This keeps students safe as they cross the roadway. Do not try to pass, slow down, or honk—those actions endanger children and violate the law.