Final answer:
Red inset lights act as stop bars on runways to control aircraft/vehicle movement, requiring clearance from ATC before crossing. They are safety measures to prevent runway incursions.
Step-by-step explanation:
The single row of flush or semi-flush red inset lights mentioned are critical components of airport runway safety systems, installed to regulate aircraft and vehicle movement on the ground. These lights, typically along the position marking of Runways 08L/26R and 08R/26L, act as stop bars that signal to pilots and drivers the status of their clearance to enter or cross the runway. When the lights are illuminated, it serves as a mandatory stop signal indicating that it is not safe to proceed.
An operator must obtain clearance from ATC (Air Traffic Control) before entering Runway 08L/26R or 08R/26L, which is a standard safety procedure. The red stop bar lights being turned off is the visual cue to proceed. Compliance is mandatory, and there are strict protocols stating that under no circumstances will an aircraft or a vehicle cross an illuminated stop bar. This rule helps prevent potential collisions or runway incursions, ensuring the orderly and safe flow of air traffic.