Which doesn't explain what's happened to the M1 near the airport. While two lanes it went from 120 down to 80. Now three lanes it has gone to 60.
60 km/hr on a 3 lane stretch of motorway. How's that encouraging people not to speed? The Malahide road is 60 km up to Coolock.
Maybe the lower speed limit is to account for tourists in unfamilar hire cars coming from the airport?