International Civil Aviation Organization (ICAO)'s basic objective is the development of safe and efficient air transport.
ICAO collects and publishes comprehensive aviation data, and produces manuals for the guidance of states in such areas as statistics, air traffic and air navigation facilities. One of ICAO's chief activities is standardization, establishment of International standards, recommended Practices and procedures covering the technical fields of aviation.
ICAO sets the standards on marking and lighting of telecom towers internationally. Below is a brief guideline of how the code affects the tower industry:
For more information on the standard: International Civil Engineering Organization (ICAO)