Runway Stop Bars
Runway Stop Bars are considered a valuable line of defence against aircraft and vehicles mistakenly entering a runway without ATC clearance. A runway incursion (RI) is any occurrence at an aerodrome involving the incorrect presence of an aircraft, vehicle, or person on the protected area of a surface designated for the landing and take-off of aircraft . The European Action Plan for the Prevention of Runway Incursions highlights that safety studies have demonstrated that the use of high intensity stop bars can be an effective RI prevention barrier. The guide further recommends that the Aerodrome Operator should, with ANSPs, consider the implementation of stop bars at all runway holding points at all runway holding positions.
Stop bars consist of lights spaced at intervals of 3 m across the taxiway, showing red in the intended direction(s) of approach to the intersection or runway-holding position. ICAO Document 9870, Manual on the Prevention of Runway Incursions, recommends that stop bars shall be switched on to indicate that all traffic shall stop and switched off to indicate that traffic may proceed.