Elevators carry a large number of passengers daily, including children, elderly people, and individuals with disabilities. A single malfunction can lead to serious accidents such as falls, entrapment, or mechanical failures. According to the U.S. Bureau of Labor Statistics, elevator-related incidents cause hundreds of injuries annually, some of which are fatal.

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Unintended Car Movement (UCM) is defined in ASME A17.1‑2019 Section 1.3 as any movement of an elevator car away from a landing that is not intended, resulting from failure of the driving-machine motor, brake, coupling, control system, or other component on which intended car movement depends.