This photo comes from the Edinburgh Street Lighting collection of
photos held in the Edinburgh City Archive. There is no information
about the photographer or the date of the photo on the back of this photo.
This looks like a rather substantial sign to me. The design looks
suitable for a lighthouse, rather than a road sign.
It is a little difficult to read the legend on this sign (even after
enhancement using Photoshop) but I believe it read:
- LEFT ARM:
A8 Glasgow 36
- RIGHT ARM: Edinburgh 5
I cannot read the legend on the
third arm, but the distance from Edinburgh suggests that the sign would
have been at or near Maybury Junction and that the third arm would have
been pointing to the north towards Barnton.