Which type of ladder is specifically mentioned as needing secure locks?

The extension ladder is specifically mentioned as needing secure locks because it is designed to be adjustable in length. This means that when the ladder is extended for use, it is crucial that the locks are firmly engaged to prevent any accidental collapse while someone is using it. The security of the locks ensures the ladder remains stable and safe for the user, especially when working at heights. If the locks are not secure, there is a significant risk of the ladder slipping or collapsing, which could lead to serious injuries.

The extension ladder's distinctive construction requires these safety features to mitigate the inherent risks associated with its use. In comparison, other types of ladders, like step ladders and folding ladders, typically have more solid, stable designs and often do not require locking mechanisms to the same extent, as their construction provides inherent stability when in use.