What is the function of a pressure-sensitive edge on a door panel?

The function of a pressure-sensitive edge on a door panel is to prevent a door from closing if it detects an obstruction. This safety feature is designed to protect individuals and objects from being trapped or injured as a door closes. When pressure is applied to the edge, such as from a person's hand or body, the mechanism recognizes the resistance and initiates a reversal of the door's movement. This critical function is part of modern safety standards for elevators and automatic doors, ensuring that the door can operate effectively without posing a risk to users.

The other options, while they may relate to different aspects of door operation or design, do not align with the specific purpose of the pressure-sensitive edge. For example, enhancing the closing speed or aesthetic appeal does not contribute to safety, and increasing the strength of the door material addresses durability rather than the operational safety provided by a pressure-sensitive edge.