As we all know, ladders can be dangerous. At best they are awkward, potentially unstable, and ergonomically compromising. At worst they are a means to death or permanent disability. People get hurt staying on a ladder when it shifted, getting off ladders, carrying ladders, and wearing inappropriate footwear such as flip flops.
Any work above grade level increases the risk injury; the greater the elevation, the greater the danger. It's no surprise that OSHA consistently lists ladders as one of their top safety violations each year.
As a result, there are several requirements that are focused on ensuring employee safety while using temporary ladders.