[Tagging] Trail intersection markers

[Lars Ahlzen]

Around here (Massachusetts, USA), it is very common to assign 
numbers/codes to trail intersections - particularly in areas where 
trails are dense (such as nature reserves). Intersection numbers are 
typically posted on small signs at the actual intersections and included 
on local maps.

Here's an example:

http://www.ahlzen.com/misc/trailmarker.jpg

I've found very little on the subject (is this practice not used 
anywhere else?) One tagging scheme that seems to be use occasionally, 
though I'm not sure it's a perfect fit, is:

information=guidepost
name=... or ref=...

How would (or do) you tag such intersection markers?

-- 
Lars Ahlzen
lars at ahlzen.com