What type of ladder can function as a single, extension, or A-frame ladder?

The combination ladder is designed to serve multiple functions, allowing it to be used as a single ladder, an extension ladder, or configured in an A-frame (also known as a step ladder) format. This versatility makes it a valuable tool in firefighting operations, as it can be adapted to various situations and needs based on the task at hand.

When deployed as a single ladder, it can be leaned against a structure for quick access. In its extension form, it allows firefighters to reach higher locations without requiring multiple separate ladders. The A-frame configuration provides stability and support when working at lower heights, making it safer and more accessible for certain tasks. The unique design of a combination ladder incorporates hinged sections and locking mechanisms that facilitate these transformations, ensuring it meets the diverse requirements of firefighting.

Other ladder types, like folding, extension, and roof ladders, do not possess the same multifunctional capabilities as the combination ladder, which is what distinguishes it in this context.