What should you do when you see this?

• When the school bus stop arm is extended and the red lights are flashing, you must stop and are prohibited from passing.
  Explanation:

  "When a school bus has its stop sign extended and red lights flashing, drivers must remain stopped until the bus retracts its stop sign and the lights stop flashing."
• You must slow down and proceed with caution.
• You are allowed to pass the bus carefully if no children are crossing.
• You must honk to alert the driver before passing.