What is the primary purpose of an emergency stop switch on an escalator?

The primary purpose of an emergency stop switch on an escalator is to immediately halt escalator operation in case of an emergency. This function is crucial for ensuring the safety of passengers and responding to situations where rapid intervention is necessary, such as when someone falls or there is a malfunction.

In the event of an emergency, the ability to quickly and effectively stop the escalator helps prevent further injury and allows for immediate assistance to be provided. The emergency stop switch is designed to be easily accessible and recognizable, allowing anyone in the vicinity to act promptly when needed. Such safety features are standard across various types of escalators to ensure that user safety is prioritized.

The other options do not directly relate to the core function of an emergency stop switch, which is focused exclusively on halting operation to mitigate danger.