What feature is commonly observed on modern metal and fiberglass ladders?

The correct answer highlights a key feature of modern metal and fiberglass ladders, which is their versatility in operation. Many contemporary ladders are designed to be utilized effectively with the fly facing away from the structure. This design allows firefighters to position the ladder in various orientations depending on the specific needs of the situation, enhancing accessibility and ensuring safer operations when navigating challenging environments.

While other features like increased weight capacity, stability in heavy winds, and safety harnesses may be important characteristics of modern ladders, they do not address this unique operational capability specific to the use of the ladder's fly component. The ability to position the ladder effectively facing away can be particularly advantageous in scenarios where stability and reach are crucial, making it a key operational detail for firefighters.