marno21 wrote: » The existing airport setup would be more than sufficient if it had a Metrolink type setup to deal with all the passengers.
Kermit.de.frog wrote: » Yes, yes there is. :cool:
Geogregor wrote: » There really is no need for massive "Texas style" concrete madness there
Chris_5339762 wrote: » I was flying into Gatwick on Saturday and realised that the M23 junction with the Gatwick road is exactly the same, and takes a hell of a lot more traffic than Dublin. Now, I know its the UK which should not be taken as an example of how to do junctions, but it is interesting.https://goo.gl/maps/rFjsyeUEL2N2
marno21 wrote: » The roundabout at J3 on the M1 is there to end motorway restrictions at that point. There is a pedestrian crossing between the two roundabouts mentioned, which would not be allowed if that was a motorway (which it would be without the roundabout closest the M1).
Kermit.de.frog wrote: » Another example - J4 on the M1 [image removed] Why is there a roundabout there? What is wrong with these people? The next exit on that road is also a roundabout so it makes zero sense.
Kermit.de.frog wrote: » Yes. There is a roundabout a few hundred meters up the road with no other access in between. Ergo that roundabout should not be there.
Aontachtoir wrote: » Or €100m spent on other road projects which had a higher cost-benefit ratio at the time.
Aontachtoir wrote: » It makes sense to me. The roundabout prior to entering the road under motorway restrictions allows non-motorway traffic to use the full R125 all the way to the onramp. With the roundabout, non-motorway traffic can then turn around and avoid the motorway. Am I missing something?
Kermit.de.frog wrote: » Another example - J4 on the M1 Why is there a roundabout there? What is wrong with these people? The next exit on that road is also a roundabout so it makes zero sense.
Kermit.de.frog wrote: » This junction will probably cost €100m to upgrade to freeflow. That is the cost to taxpayers of stupidity and not doing things properly the first time.
marno21 wrote: » Even if you take a look at some of the interurbans M6 - ends at a roundabout; frequently congested
Dream Raspy Barbiturate wrote: » What the actual f**k have they done to the Dublin Airport roundabout? Did a child design the light sequence? :mad: :mad: Any time those lights are out, there is never any traffic. Yet what they have done now is increase journey times by about 10-15 mins just on that round about alone. What was the point of all of that work?
Chris_5339762 wrote: » The Galway one I can understand, either side of the trumpet would just head into two other signalised junctions anyway so it would make precisely no difference overall. Also, its only there as it stands for so long because the original GCOB plans got shelved otherwise it would be meaningless. The M8 one at Dunkettle is a disgrace but at least thats getting sorted. The M7 flows straight into the N18 at a nice junction, its the N21 that is the problem. The M9 I agree is utterly ridiculous and the M17 one probably should have had a proper junction at Tuam and a roundabout with the old N17 north of Tuam to slow traffic.
marno21 wrote: » Even if you take a look at some of the interurbans M6 - ends at a roundabout; frequently congested M7 - ends at a freeflow junction with 2 other motorways, one of which leads to Galway, the other carries a large volume of M7 traffic southwards and ends 3km before a village M8 - ends at the most congested at grade junction in Ireland M9 - ends at a roundabout with the N24, connecting to a grade seperated roundabout with the N25 M17 - ends at a roundabout with the old N17 before continuing as dual carraigeway
AugustusMinimus wrote: » Poor junction design is by far the biggest issue with urban road systems in Ireland. By far.
marno21 wrote: » It's a weird one in Ireland. We are consistently building mainline alignments of roads that are well above the required capacity, resulting in overspecced and wonderful to drive roads (M3, M9, M17 to name a few). Then we come along and ruin it all by these ridiculously under-powered junctions that are either crammed with traffic or turn into massive capital projects to upgrade them. In many cases, the junctions are in stupid locations that limit upgrading of them. There is no need for the type of highway interchanges you'd see in Atlanta or Houston, but the correct junctions for the correct road capacity would be handy. Motorways and dual carriageways ending at terminal roundabouts, at grade junctions on busy routes, all problematic. This is more of a legacy issue than an issue going forward however, many of the new roads being designed at present don't suffer this flaw.
