Which component is essential for escalator step safety?

The correct answer identifies comb plates as an essential component for escalator step safety. Comb plates are located at the entry and exit points of the escalator and serve a crucial role in minimizing the risk of entrapment or injury. They are designed to interlock with the step treads, ensuring a smooth transition between the steps and the stationary landing. This design helps prevent any gaps that could potentially catch clothing or body parts, which is particularly important given the movement of the escalator steps.

While step treads, handrails, and mats at the landing are also important for overall safety and user experience, they do not specifically target the critical issue of preventing entrapment at the points where users board or leave the escalator. Step treads provide traction for users, handrails assist in balance, and mats help in reducing slipping, but it is the comb plates that directly address the potential hazards related to the interaction of moving steps with the landing area. Therefore, the role of comb plates in escalator safety is both specific and vital.