runway lights are what color
NOTE-Some airports may have a row of three or five in-pavement yellow lights installed at taxiway/runway intersections. Stop Bar Lights. Stop bar lights, when installed, are used to confirm the ATC clearance to enter or cross the active runway in low visibility conditions (below 1,200 ft Runway Visual Range).
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 lights provide direct, immediate alerts and require no input from controllers. In July 2013, the FAA re-scoped the program to 17 airports.