Interview with Ryo Mizushima, Technical Officer, Aerodromes and Airport Operations at ICAO on Doc 9157 - Part 4 and the updates on the latest 5th edition. The manual is available on the ICAO store: https://store.icao.int/en/aerodrome-design-manual-part-4-visual-aids-doc-9157-part-4.
Proper design and installation of visual aids are prerequisites for the safety of airport operations. Part 4 of Doc 9157 provides information on the characteristics of visual aids used at airports. Some of the topics covered are functional requirements of visual ground aids; surface marking and markers; approach lighting systems; light characteristics for precision approach runways and taxiways; runway lead-in lighting systems; runway and taxiway lighting; surface movement guidance and control systems; taxiing guidance signs and obstacle lighting.