In certain airspace classes, a speed limit of 250 knots IAS is imposed for aircraft flying below FL100/10.000FT, according to the airspace classes defined by ICAO. How did this limit find its way into the ICAO SARPS?
The answer to this question gives a good reason why such speed limits were introduced in the USA by the FAA. I am interested in finding out why the same speed limits were de facto rolled out world wide by being included in the ICAO SARPS. Did the ICAO include the 250 KIAS below FL100 restriction for the same reason the FAA did, or are there other (additional) reasons?
For example, was this done to give pilots a better chance of spotting other traffic? To reduce the severity of bird strikes? To provide consistency with FAA rules? To allow more efficient air traffic management? To reduce noise? Or for other reasons entirely?
I am looking for actual sources on this matter, not guesses and opinions.