Not sure it is 'Ghost' as technically it's still in use, but I was reminded recently of the very old (guessing it's from the early 70's) sign in Billingham.
Located at the very top of The Causeway (western end), it warns bus drivers to be careful when performing u-turns.

Whilst the area around it has been 'modernised', and new shelters installed - it was nice to see the sign has remained in situ.