How many people are recommended to be on a ladder at one time?

The recommendation to have only one person on a ladder at any given time is rooted in safety considerations. Having a single person on the ladder reduces the risk of instability and accidents. When two or more individuals are on a ladder simultaneously, their combined weight can compromise the ladder's stability and increase the likelihood of tipping over or causing an imbalance.

Safety protocols emphasize that a single user can ensure they maintain three points of contact with the ladder at all times, which is essential for maintaining balance and control. Additionally, a lone user can focus solely on the task at hand without the distraction or movement of others, which also contributes to a safer working environment.

In contrast, the other options suggest scenarios that either increase risk by having multiple individuals on the ladder or imply an inappropriate approach to ladder safety, which goes against established guidelines meant to protect users.