When should a bus driver engage the emergency brake?

Engaging the emergency brake is a critical safety procedure that should be performed during emergencies to help prevent accidents or mitigate their severity. The emergency brake is designed to be used when a bus driver faces an urgent situation, such as system failures or a need to stop quickly to avoid a collision. In these circumstances, the emergency brake helps ensure the bus comes to a halt safely.

Using the emergency brake is not appropriate during regular stops, as this could lead to unnecessary disruptions. It is also not advisable to engage it only when the bus is parked, as this does not utilize the emergency brake's purpose effectively. Additionally, using the emergency brake at arbitrary times based on personal discretion could create hazards and is generally not recommended. Therefore, the correct context for employing the emergency brake is specifically in emergencies to enhance safety and control.