Much like the roads back in the U.S. most roads in Ireland have a number designation, but they also have a Letter attached and that is where the story really gets told.
At the top of the bill are the “M” Roads. The “M11” or the “M7” as an example are super-duper ultra modern divided highways. In Ireland a divided highway is called a “Dual Carriageway.” These roads are in much better condition and better laid out than anything on the American Interstate System.
A slight notch below the “M” Roads are the “N” Highways. These are also excellent roads where you make good time at 120 kph or about 70 mph. They are a good way to travel about the country.
Now, it is on the “R” roads where everything starts to fall apart.