Perhaps most obvious is the fact that Ireland drives on the left side of the road. If you’ve never done it before, this is going to be the biggest adjustment that you’ll have to stay conscious about and almost vigilant about.
Don’t expect too many highways – The highways are known as motorways (M-class) and there are only a few that branch out from Dublin.
For the most part, you’re going to be driving on R and L-class roads. These are all paved roads so no worries about needing to go off-road in Ireland.
This was probably the biggest shock of all beyond driving on the left. There are a lot of roads you’ll be on that will be no wider than 1.5 car widths.
When you’re the only one in sight, this is fine but our hearts may have skipped a beat each time there was an oncoming car. Locals drive really fast and the corners are particularly unpredictable so my advice is to take it slow.