How about using different colour lights for taxiways and runways. They are already using different colour tarmac lines: yellow vs white.
> Runway and approach lighting for runway 28R were on and set to default settings, which included a 2,400-foot approach lighting system, a precision approach path indicator, touchdown zone lights (white), runway centerline lights (white at the approach end), runway threshold lights (green), and runway edge lights (white at the approach end).
Taxiway: centre green along length, blue edge lights. Can have planes on it. Runway: centre white along length and edges (also landing zone), perpendicular green at end thresholds. Should not have planes on it.