What is the function of a stop on a ladder?

The function of a stop on a ladder is primarily to prevent the overextension of the fly section. In extension ladders, the fly section is the part that extends to increase the ladder’s height, and the stop is designed to limit how far this section can be pulled out. This is crucial for safety, as allowing the fly section to extend beyond its designated limit could lead to instability or even collapse. By preventing overextension, the stop helps maintain the structural integrity and safety of the ladder, ensuring that it remains within safe operational parameters.