What safety measure is triggered by a deviation in handrail speed from step speed?

If the handrail speed deviates from the step speed, the escalator is designed to stop as a safety measure. This is crucial because a discrepancy between these speeds can indicate a malfunction or a potentially dangerous situation. The handrails and steps of an escalator should move in synchronization to ensure passenger safety; if they don't, it could lead to tripping or falls. Stopping the escalator eliminates this risk, allowing for a safe resolution of the issue and ensuring that no passengers are harmed. This automatic response is part of the safety protocols put in place to protect users and maintain the escalator's integrity.