M9 motorway (general thread)
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The N24 Mooncoin Bypass was planned before M9, and as far as I can tell it was not revisited before 2011, when it was officially suspended. The map below shows the last-known corridor for the N24 scheme, from 2002. This was expected to be a 2+1 road, like the N24 Piltown-Fiddown scheme, just west of it.
The blue part at bottom-right is the terminal roundabout for M9, although when this was drawn that road was still planned to be N9.
Based on that, the eventual junction could be as simple as this:
I don’t accept that the current interchange is a “bad design”. It does a lot in a very limited space. If you don’t know the terrain here, it’s easy to be fooled into thinking that a full free-flowing interchange was a possibility for N25/N9, but in the photo below, note that there are three levels here already, so even what you think is the “ground” level for any free-flow junction would have to be elevated...
For an on-the-ground view, look around from here: R448 - Google Maps
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You quoted my post, so just to clear it up for you, I’m not “on a wind up”. Good engineering means achieving the required performance with the minimum use of resources. This junction fits that description. Have you ever seen it jammed in normal use? It’s handling the traffic perfectly well. Even at morning and evening peaks, it’s a matter of seconds to clear it.
I get that it doesn’t “look” like you think an interchange should, but if you’d built all the pretty free-flowing link roads, but you’d have spent five times as much money doing it, and the thing wouldn’t work any better. Over-engineering is bad engineering.
In another European country, this would not have even been a motorway. But there’s no unbreakable law about how you terminate a motorway. Here’s the terminus of Autobahn 81 in Southwest Germany, with a nice roundabout for you:
.. and at the other end of the country, A27, Cuxhaven (on the Elbe estuary).
But here’s A31 at Emden, which ends at a crossroads:
..and A94, which turns into a city street, and finally ends at crossroads on the eastern side of Munich.
Post edited by KrisW1001 on1 -
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