I can say the furlong is a known length in the US and it even sees use on the interstate system as 1/8 mile increments are occasionally signed (although I have never seen 1/8 mile, think it was 3/8 ad 5/8 that I saw).  I've seen several old British signs that are still in place along roadsigns of public roads in the UK that a buddy of mine there showed me.  Perhaps if he or the author consents, I could put them up here?  Think one was furlongs and there may or may not have been one that was in miles and eighths.

Also, does anyone have some information about the Myanmar furlong sign.  Some internet armchair expert was claiming they were all kilometers "now" which I had assumed correct, until seeing an even newer post, less than 6 mos. old talking about biking there and how "everything was still in miles [and furlongs] there.  If we had a more current picture of the signage there, even if it's the same damned toll plaza, that would go a long way.  Their government website, at least in English, is, shall we say, lacking?