Possibly the most effective health and safety signage I have ever seen.
this post was submitted on 15 Jul 2023
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The top step and top cap are not allowed to be used according to OSHA (also practical sense) for those wondering.
oh so I'm not insane after all for stopping on the second to last step.
It's all about maintaining 3 points of contact when moving a limb. 2 feet and a hand or 2 feet and a hip/knee when using both hands. If your feet are on the top step then you don't have a knee or hip to keep the 3rd point of contact. And stepping on the top cap means no where to lean onto if you lose your balance (this one is self explanatory).
It's also about the design of the ladder. The top plate is literally not a step, and the bearings for it don't account for it to be used as a step, so the forces involved can mess up or break the connection to the rest of the ladder.
..not that they always will, just that it's a very bad idea.