Question: ATS Routes
 

Here in Puerto Rico we are an FAA facility adjoining a number of ICAO facilities. In the U.S., we had "colored airways" based on L/MF beacons, although they've pretty much passed into history.
As a result, we all assume that ATS Route B520 is to be called "Blue 520". I've heard that's incorrect; it should be called "Bravo 520". I would guess the answer could be found in the 4444, but have been unable to find it. Anyone know the correct answer and reference? Thanks.
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ATC Chat

In the UK all airways were redesignated several years back to comply with Intl standards, hence loss of all the pretty colours...

It was, allegedly, confusing to a foreign pilot. So they can learn such words as altitude, pressure, procedure, acceleration etc etc etc... but blue, red and white was too difficult for them (I suppose they're only aircrew?)

Not sure where the reference for the standard is... but I was once told he origin of the colours came from the first commercial routes laid out in the US, which were marked by coloured lights... you simply follow the blue route, turn left down the red route and follow it to destination... that's the way to Amarillo?

There are some references in here :
http://www.eurocontrol.int/icard/pub...d_page/rd.html

'Cos pilots are simple souls. To paraphrase Dave Gunson; flying from Scandinavia to London, avoiding the CLN Sector, was, "Down the Red one, turn right on the Blue one, then left on the Amber one.":ok: