Runway marking stripes that supplement runway side stripes and identify non-useable pavement areas are called?

Runway shoulder markings are specifically designed to identify the areas adjacent to the usable pavement on a runway. These markings serve a crucial function in enhancing safety by delineating sections of the pavement that cannot be utilized for takeoffs or landings. They assist pilots in recognizing boundaries, particularly in low visibility conditions, and help ensure that aircraft remain on the designated runway space.

While other markings exist in the runway environment, such as threshold markings or chevron patterns, they have different purposes. Threshold markings indicate the beginning of the runway for landing, whereas chevrons are typically used for area identification and to provide visual guidance for taxiing or other maneuvers. In contrast, shoulder markings are specifically focused on the boundaries of usable space, making them essential for proper runway operation and safety.