What is one of the key safety practices for tree trimmers working at heights?

The correct choice emphasizes the critical importance of using harnesses and other fall protection equipment when tree trimmers are working at heights. Safety harnesses and fall protection systems are essential to prevent serious injuries or fatalities in the event of a fall. Working at elevated heights poses inherent risks, and proper safety gear mitigates these hazards by securing the worker to a stable structure or through a system designed to catch them in case of a slip or loss of balance.

The use of these safety devices allows for greater peace of mind while performing tasks such as cutting branches, which often involves awkward positions and unstable footing. Additionally, this practice aligns with industry regulations and standards that require fall protection for workers at significant heights. Therefore, adhering to this safety measure not only protects the individual but also contributes to a culture of safety in the workplace.