According to subway operations, what is the most effective way for communication between a motorman and an employee at the front end?

The use of buzzer signals is considered the most effective way for communication between a motorman and an employee at the front end for several reasons. Buzzer signals are a standardized method that can provide clear, immediate communication while minimizing background noise and distractions that can occur in a subway environment. This system allows for rapid and unambiguous transmission of messages, ensuring that both the motorman and the crew member can respond swiftly to changing conditions or instructions.

Buzzer signals also support a visual and audible cue that can be rapidly recognized and acted upon, which is crucial for safety in train operations. This method is particularly beneficial in noisy environments such as subway systems where verbal communication may be difficult or impractical. By relying on a consistent and recognized signaling system, it reduces the chances of miscommunication that could potentially lead to hazardous situations.

Other methods, while useful in specific contexts, do not match the effectiveness of buzzer signals for this purpose. For example, verbal commands may be hindered by loud ambient noise, hand signals may not always be visible, especially in certain lighting or positions, and written notes can take too long to convey urgent messages. As a result, buzzer signals remain the preferred choice for effective communication between a motorman and an employee at