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On runways with both approach lighting and runway lighting (runway edge lights, taxiway lights, etc.) systems, the approach lighting system takes precedence for air‐to‐ground radio control over the runway lighting system which is set at a predetermined intensity step, based on expected visibility conditions. Approach Lighting Systems - Research & Development. The purpose of this research is to determine if a more effective, cost efficient Approach Lighting Systems (ALS) can be developed to meet the increasing need at airports. This effort includes: Modifying and/or reducing the number of lights in a standard ALS configuration. Approach lighting systems extend visual cues to the approaching pilot and make the runway environment apparent with less visibility than when such lighting is not available. For this reason, lower straight-in (not applicable to circling) visibility minimums may be established when standard or equivalent approach lighting systems are present . This is an ODALS approach lighting system. 5) You're landing on a runway that has a pulsating VASI. What color would you see if you were slightly below glide path?