Paul,
Well, no not really, all new signs post-1970s are in KM and have KM written on them. There is supposed to be a change of speed limits to KMPH at some stage too which would actually involve moving away from the standard EU circular speed limit signs to something that looks substantially different to avoid confusion between MPH and KMPH
At the moment in very rural areas you'll still find the odd sign in miles on a cast iron fingerpost sign with the old road numbering system too!
The current road numbering system has 3 categories:
R- Regional route (3-digit number) e.g. R-604
N- National Primary / Secondary Route N-17
and M- Motorway M-7
The old system had T- Trunk
and L- Link
