Fingal Co Co has published plans for the widening of a 2km section of the M1 to Dual 3 Lane. The section is between J2 (Airport) and J3 (Drinan). An interesting point, the specs for the Northbound carraigeway is for 3 x 3.65m lanes, while those for the Southbound carraigeway is for 3 x 3.5m lanes. Also, the Hard Shoulders are down as varied - so maybe they'll stay at 3m generally. The Median Strips are 1.0m as usual.
What I'm guessing is that a 100kph limit will be imposed for Southbound traffic in order to keep the pressure off the M50. If that's so, can one conclude that the standard specs for a 3 lane motorway carraigeway are:
1 x 3.00m Hard Shoulder
3 x 3.65m Lanes
1 x 1.00m Median Strip
Total Pavement: 14.95m?
Another interesting point is the two concrete median barriers proposed. The link is as follow:
New camera active online shows the site