What is the importance of using a harness when working at heights?

Using a harness when working at heights is crucial because it provides fall protection and prevents serious injuries during accidental falls. When workers are elevated, even a minor misstep can result in a dangerous fall, leading to severe injuries or fatalities. A properly fitted harness effectively secures the worker to a stable anchor point, significantly reducing the risk associated with working at heights. It acts as a critical safety measure designed specifically to protect workers from the hazards posed by falls, allowing them to focus on their tasks without the constant fear of an accident.

While the other options might highlight benefits of harnesses in certain contexts, they do not capture the primary and most critical function of a harness in maintaining worker safety. Harnesses are not primarily designed to assist in climbing, improve work efficiency, or support tools; instead, their essential purpose is to enhance safety by mitigating fall-related risks. This makes the correct answer of fall protection significantly more important than the benefits outlined in the other choices.