What characteristic is common for run-up areas?

Run-up areas are designated spaces on an airfield where aircraft can safely perform engine run-ups or engine tests before departure. A key characteristic of run-up areas is that they are typically surrounded by a blast fence. This design feature is important for safety, as it helps to deflect the high-velocity exhaust and potential debris produced by aircraft engines away from personnel, equipment, and other aircraft nearby. The use of blast fences minimizes the risk of injury or damage, making it an essential safety measure in the operation of run-up areas.

Other aspects that might be associated with run-up areas, such as their proximity to terminals, visibility lighting, or fuel availability, do not universally apply to all run-up areas, as these features can vary significantly based on the airport layout and operational requirements. The primary function of a blast fence in this context focuses on enhancing safety during engine tests, making it a defining characteristic of these areas.