You're the driver of a one-person-operated double-deck bus. How do you stay aware of passengers on the top deck? You're the driver of a one-person-operated double-deck bus. How do you stay aware of passengers on the top deck?

• Possible answers:

   
• A. By counting passengers up and down the staircase
• B. By frequent checks upstairs while stopped at bus stops
• C. By listening to passengers in the upstairs gangway when approaching bus stops
• D. By making full use of the internal mirror system