This is for Bluenotebob. Kilometre signs are ten a penny in France,
Thanks - they may be ten a penny in some parts of France but they're rare round here (in central Brittany).
I'm sure I've seen some old (well, 19th century) distance markers on the Nantes-to-Brest canal .. and there may be one or two on some of the old disused coaching routes (17th or 18th century).
If I can find them, I'll post photos on the forum somewhere - and, if I remember, I'll cross-reference your 'milestone' thread.
Good luck - as I said before, it's a nice idea.