Which of the following is a safety measure to take when working at heights?

Using fall protection systems is a fundamental safety measure for anyone working at heights. These systems are designed to prevent falls or to safely arrest a fall if one occurs. They can include equipment such as harnesses, safety nets, and guardrails, which are critical in protecting workers from the dangers associated with elevated work environments.

In the context of working on telecommunications towers, where the risk of falling can lead to severe injury or fatality, having a reliable fall protection system is essential. It ensures compliance with safety regulations and guidelines set forth by occupational health and safety organizations. Proper use of these systems not only protects the individual worker but also contributes to a culture of safety within the workplace.

Other options present unsafe practices or misconceptions about safety. For example, working alone increases the risk because there is no one to assist in an emergency, and skipping safety training compromises the worker's knowledge and preparedness for hazardous situations. Additionally, climbing ladders over 15 feet tall without adequate protection is not advisable, as it disregards the need for proper safety measures regardless of ladder height.