What happened to the status of the newer greenish signs that I've been seeing for 3-4 years? I assumed they were replacing the old blue and white ones. (personally, I find the green ones much easier to see - the other ones just get lost for me with the other station accessories. (I'm not sure why ... I think in theory the yellow on blue should be more visible).
Here's a couple of photos from a year ago (sorry for the quality, they were just in the distant background of the shots).
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