The IR858I LED airfield guidance sign is the latest model of airfield sign to be manufactured by atg airports. This sign is specifically designed to meet the ICAO requirements for Mandatory and Information airfield guidance signs. (ICAO Annex 14, Vol.I, Paragraph 5.4 and Appendix 4.)
Information signs are signified by yellow characters on a black background (location signs) or black characters on a yellow background (destination signs) and are used to provide additional guidance to pilots manoeuvring aircraft on the ground.
Mandatory signs are characterised by white characters on a red background and are used to advise pilots (and vehicle drivers) of an airfield location beyond which they must not proceed unless authorised by air traffic control.