A REIL system provides a visual marker of the approach end of the runway. The system consists of two synchronized flashing lights positioned on each corner of the runway landing threshold.
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An approach lighting system (ALS) is a lighting system installed on the approach end of an airport runway and consisting of a series of lightbars, strobe lights, or a combination of the two that extends outward from the runway end.
The flashing lights help to make the airplane more noticeable. They have also been suggested to reduce the risk of bird strikes. This is offered as an option or add-on for many types of aircraft.
A threshold marking consists of eight white stripes arranged evenly on the runway centerline and start twenty-feet from the runway threshold. These markings identify the beginning of the runway that is suitable for landing. As you get closer to the gate there are yellow numbers that identify the number of the gate.