"Richard J." wrote in message


k...

"I'm at a green signal at Red" it could get quite confusing over a radio so
it not used for that reason.

But "REB" is unlikely to sound much different to "red" over a two-way
radio either. Whatever happened to the phonetic alphabet? If they used
that the message you suggest would become "I'm at a green signal at
Romeo Echo Delta"; a far more comprehensible piece of communication!