The lights provide direct, immediate alerts and require no input from controllers. Embedded in the pavement of runways and taxiways, the lights automatically turn red when other traffic makes it dangerous to enter, cross, or begin takeoff. The Canadian Aeronautical Information Manual, which has all of the signals to include the two that are relevant to this question, can be found here. Runway Status Lights tell pilots and vehicle operators to stop when runways are not safe. Put in the chief's colloquial jargon: "Flashing green lets the pilot know "the runway will be there for you when you come back for your next approach." The green light is the 'friendly' light between choices of red and green.
And then waving off and flying off in search of another field while still NORDO. What they want to avoid in this case (again, this is what I was taught by a salty old Navy controller when I was in flight school) is that they wanted to avoid the aircraft attempting to land being "spooked" by a red light and thinking they can't land at this field. Runway Centerline Lighting The row of lights extending down the center of the runway is called the runway centerline lighting. Tower operators would rather get that aircraft who can't talk to them onto the ground. These flashing green lights face the approach end of the runway to help pilots identify where to land and to validate that they are not landing short of the runway. ( And the steady green ought to confirm that on the next pass, if all things go well). because they could not communicate with you, but they wanted you to not land on this pass (interval a mess, crossing traffic, winds maybe wrong, a dozen other things that might crop up) it was more or less "the runway will be ready for you if you take another lap in the pattern." This also gives them a bit of time to get all of the other aircraft in the pattern out of the way of the aircraft in distress.
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