Runway End Identifier Lights (REIL)

REILs are installed at many airfields to provide rapid and positive identification of the approach end of a particular runway. The system consists of a pair of synchronized flashing lights located laterally on each side of the runway threshold. REILs may be either omnidirectional or unidirectional facing the approach area. They are effective for:

(a) Identification of a runway surrounded by a preponderance of other lighting.

(b) Identification of a runway which lacks contrast with surrounding terrain.

(c) Identification of a runway during reduced visibility.