Transport Canada/NAVCAN is a governmental regulatory organization overseeing air, rail, marine and road transportation.
It also sets the standards on marking and lighting of telecom towers within Canada.
The purpose of such standard is to ensure that an obstruction to air navigation remains visible at a range sufficient to permit pilots take appropriate action to avoid obstructions shorter than 305m/1,000ft within a horizontal radius of 610M (2,000 Ft) from the obstruction. Below is a brief guideline of how the code affects the tower industry:
For more information on the standard: