Safety:(2) Legislation and Escalators: (2. 4) Key Safety Features: To enhance passenger safety, newer models of escalators are equipped with one or more of the following safety implementations, as per ASME A17. 1 code: Antislide devices: Raised circular objects that often stud the escalator balustrade. Sometimes informally called "hockey pucks" due to their appearance, their purpose is to prevent objects (and people) from precipitously sliding down the otherwise smooth metallic surface. Combplate impact switches: Stop the escalator if a foreign object gets caught between the steps and the combplate on either end