What safety measure should be taken when using an aerial ladder?

The correct choice emphasizes the critical importance of ensuring that the aerial ladder is properly placed and secured before use. Proper placement involves assessing the surface beneath the ladder for stability, checking that the ladder is at the correct angle for optimal strength and reach, and ensuring the stabilizing feet are positioned securely to prevent any movement during operation. Securing the ladder also includes locking mechanisms that prevent it from sliding or collapsing, which is essential for the safety of firefighters and any individuals being rescued or aided with the ladder's assistance.

Other considerations like visibility during nighttime operations or maintaining a distance from the structure are important but do not address the foundational task of ensuring that the ladder is safely deployed and stable before it is used. Similarly, aesthetic checks are irrelevant when considering the functionality and safety of the ladder in emergency situations. Safety in ladder operations is paramount, making the correct placement and securing of the equipment the primary focus.