Runway edge markings are critical visual aids used in aviation to define the lateral limits of the runway usable for takeoff and landing. These markings consist of continuous white lines located along each edge of the runway, providing a clear visual contrast between the paved structural surface and the surrounding shoulder or terrain. In 2026, as airports increasingly handle larger aircraft with wider wingspans, these markings are more vital than ever for maintaining directional control, especially during nighttime operations or in low-visibility conditions like fog or heavy rain. For precision instrument runways, these edge lines are mandatory to ensure that pilots can accurately judge their alignment with the runway centerline during the final stages of an approach. Beyond providing a visual boundary, these markings also alert pilots to areas that may not be designed to support the full weight of the aircraft. By clearly delineating the "safe" operating area, runway edge markings play a key role in preventing "runway excursions," which remain one of the most significant safety challenges in modern commercial and general aviation.