In the last days, I've started to add the signs on the irish motorways on the map. To be precise, I've added exit_to tags to all junctions on the M6 west of Athlone to Galway. Next week, hopefully I'll complete the junctions on the M6 and M4 east of Athlone and to Dublin, including a good chunk of M50 and M1 junctions.
exit_to is intended for navigation software, so that the software can tell you what to look for. The exit number isn't always just enough.
I've also mapped a good few estates in Roscommon, Athlone, Loughrea including housenumbers, etc. and update maxspeed on all primary, secondary, tertiary and unclassified roads, that I come past. Again, this is all information, that is extremely helpful for navigation.