Terskeløkter

Terskeløkter, often translated as threshold lights or approach lights, are a type of lighting system used primarily in aviation and maritime contexts to indicate a safe passage or a boundary. In aviation, terskeløkter are a critical component of runway lighting systems. They are typically installed at the threshold of a runway, marking the beginning of the usable landing area. These lights are usually white and are designed to be highly visible, especially in low-light conditions, fog, or adverse weather. Their purpose is to guide pilots to the correct touchdown point and to delineate the safe landing zone from any hazardous areas beyond the threshold.

In maritime navigation, terskeløkter serve a similar function. They can be found at the entrances to harbors, channels, or alongside navigational hazards. These lights help mariners identify safe water, avoid obstacles, and maintain a proper course. The color and flashing characteristics of maritime terskeløkter are standardized according to international regulations, ensuring consistency and clear communication of navigational information. The term "terskel" itself in Norwegian refers to a threshold or sill, which accurately describes the function of these lights in marking an entry point or a critical boundary. The design and placement of terskeløkter are carefully considered to maximize visibility and minimize confusion for those navigating.