You're driving a double-deck bus. Why do you need to know if anyone is using the stairs? You're driving a double-deck bus. Why do you need to know if anyone is using the stairs?

• Possible answers:

   
• A. The upper deck is only to be used when the lower deck is full
• B. Tickets for the upper deck are more expensive
• C. Passengers using the stairs could fall if the bus brakes or swerves
• D. No-one under 18 years old may use the stairs