What is a primary purpose of using 'marker balls' in work zones?

The primary purpose of using marker balls in work zones is to delineate the position of powerlines. These brightly colored balls are typically used to enhance visibility of overhead utility lines, making them more noticeable to workers and equipment operators. This is crucial for preventing accidental contact with powerlines during construction or rigging operations, which can lead to serious safety hazards, including electrocution. The marker balls serve as visual warnings, indicating the presence and height of these lines, thereby promoting safer work practices and helping to ensure that machinery and personnel maintain a safe clearance distance.

In this context, while the other options involve important aspects of work site safety and organization, they do not fulfill the specific role of marker balls in providing visual cues for overhead utility management.