I've come across a handy trick for determining the reference number for a L road here in Tipperary - the county council publishes the Speed Limit By-Laws; and nicely refers to most roads by the L-ref value. The by-laws are available for free download off their website.
In most cases this makes it rather easy to determine what the reference number for a given road is if there's a speed-limit road-sign on it. Not all county-councils seem to follow this practice of identifying the roads in this manner, but where they do checking their By-Laws for such information is rather useful. hoping this helps, Ken -- http://short.ie/savenenaghhospital/
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