Plain English Meaning

These are the lights set into the pavement that show you the path off the runway and onto the taxiway. They are colored green and yellow, alternating, so that as you roll off the runway you can follow them through the turn until you are clear of the runway.

Full Definition

Taxiway centerline lead-off lights are in-pavement lights that provide a visual guide for pilots exiting the runway, leading from the runway centerline out to a point on a taxiway centerline that allows the aircraft to clear the runway fully. They alternate green and yellow from the runway centerline to the runway holding position or ILS critical area, where the alternating color pattern ends and begin.