General Contractor License (KB2) Practice Exam

Guardrails are primarily utilized in construction sites to provide fall protection. They are installed at elevated surfaces such as roofs, scaffolding, and stairways to prevent workers from accidentally falling off edges. The primary function of guardrails is to create a barrier that enhances safety for those working at heights, thus significantly reducing the risk of accidents and injuries associated with falls.

Additionally, guardrails can serve as a visual cue, indicating hazardous areas and helping to manage the flow of movement on-site, contributing to general workplace safety. Their design and placement are governed by safety standards and regulations, ensuring that they are effective in preventing falls and protecting workers.

The other options present various functions that do not align with the primary purpose of guardrails in construction. Supporting plumbing systems, enhancing lighting, or securing roof installations are not roles that guardrails fulfill, making fall protection the clear and primary reason for their use on construction sites.