If the door cannot be closed, what action should the driver take?

Operating the door loop bypass key switch in the leading cab is the appropriate action when the door cannot be closed. This option allows the driver to override the door control system, enabling the door to be operated manually or bypassing the faulty mechanism temporarily. By doing this, the driver ensures that the situation can be managed without endangering safety or delaying operations, especially in scenarios where an immediate solution is required.

Using the bypass key switch is often a standard procedure designed for emergencies, allowing for continued operation while ensuring the safety of all passengers. This method is proactive and adheres to safety protocols, preventing potential disruptions in service.

Other options are less effective in managing immediate safety concerns. Repairing the door manually may not be feasible in a short time frame, and it could also be unsafe. Notifying the control center, while important for record-keeping or further action, does not address the immediate issue of an open door. Leaving the door open until assistance arrives poses a significant safety risk and could lead to accidents or injuries. Thus, utilizing the bypass key switch strikes the right balance between addressing the problem promptly while complying with safety standards.