You are driving a bus equipped with a bus-stop brake. When are you allowed to use the bus-stop brake?

You answered correctly. The bus-stop brake is a special device designed for temporarily securing the bus at bus stops while passengers are getting on or off. It is not a substitute for the parking brake when parking the bus, nor should it be used for braking on a steep downhill slope. The bus-stop brake is only intended for short stops at designated bus stops, ensuring safety during passenger exchange but not for longer-term or high-demand situations. Always use the parking brake when leaving the vehicle or parking, and rely on regular brakes for controlling speed on slopes. This keeps the bus safe and prevents accidental movement.