N4 - Mullingar to Rooskey [route options published]

marno21 · 08-08-2024 12:03pm

Big chance this will be a Type 2 as well which will definitely fit under there

L1011 · 08-08-2024 12:08pm

That bridge design really looks like something that was copy/pasted between the two schemes. I think the design on Mullingar likely predates the NRA existing even though.

KrisW1001 · 08-08-2024 12:19pm

The most likely cross-section here is Type 2 DC (16.5 m paved). What’s there already is 13.5 m wide, so that only needs an extra 1.5 m on each side, which should be possible without disrupting the bridge.

I don’t think Type 1 is very likely here. The short stretch of M4 around Mullingar might be relatively busy (22,000 AADT, still well within the capacity of the road type, though), but a lot of that volume looks to be due to local traffic - the rest of this corridor is only just above the capacity of a single carriageway (14.0 k at Edgworthstown, 13.5k at Longford, 8.0 k at Dromod).

roadmaster · 08-08-2024 12:43pm

https://www.boards.ie/discussion/comment/122478192#Comment_122478192

Yip thats it, But i dont think the photo shows how low the arch is. If you put in 2+2 the outside lane for high vechicles will be very close to the belly of the bridge.

In saying that it would be not to hard or pricey in the overall project costs to just build a new bridge a little further back as its only carrying a small local road over the N4.