Forth Replacement Crossing

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Trebeck
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Re: Forth Replacement Crossing

Post by Trebeck »

I remember having to increase my velocity slightly in an old diesel car at the end of the A90, there is a bit of a downhill, to try and build up momentum for the uphill section of the start of the M90.
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Halmyre
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Re: Forth Replacement Crossing

Post by Halmyre »

Potholes ate my car wrote:Traffic management starts this Friday on the M90/A90, A92 and A823(M) ahead of the new gantry installations on the Fife side:

http://www.transportscotland.gov.uk/new ... anagement-
SPECS. Instruments of Satan.

:cry:
t1(M)
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Re: Forth Replacement Crossing

Post by t1(M) »

Why is traffic management necessary so soon? This is an off-line upgrade, and apparently work has not even started - r the new bridge itself will, presumably, be the biggest part of the job. It must be years before the approaches to the new bridge need to be started, and even longer before they are tied in to the existing roads.
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orudge
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Re: Forth Replacement Crossing

Post by orudge »

Maybe the thinking is that they'll be able to improve traffic flow (in theory) on the existing bridge approach in the mean time, which is not necessarily a bad thing if it can provide more reliable journey times.
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Halmyre
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Re: Forth Replacement Crossing

Post by Halmyre »

orudge wrote:Maybe the thinking is that they'll be able to improve traffic flow (in theory) on the existing bridge approach in the mean time, which is not necessarily a bad thing if it can provide more reliable journey times.
It won't help traffic flow northbound over the FRB if there are two streams of fast-moving traffic from the M9 spur and the A90 coming up to six miles of slow-moving traffic - a 40mph limit under SPECS will result in a traffic flow of 35mph at best as drivers err on the side of caution.
Trebeck
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Re: Forth Replacement Crossing

Post by Trebeck »

And the occasional driver doing 60mph, slowing to 40 as they drive past the cameras :roll:
matt-thepie
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Re: Forth Replacement Crossing

Post by matt-thepie »

When government documents describe a road as "motorway standard", it is not always safe to deduce from that either that it will be officially a motorway, or that it won't.
From here:
The proposed new cable-stayed bridge will have three slender single column towers and will be 2.7km long, including approach viaducts. The road carried by the bridge will be designated as a motorway.
So I think we can finally establish, as Wrinkly suggested, that the new bridge will be motorway. :-)

Does look like there is still the inexplicable section of A road at the southern end though. Perhaps they will change their minds at a later date.
Potholes ate my car
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Re: Forth Replacement Crossing

Post by Potholes ate my car »

t1(M) wrote:Why is traffic management necessary so soon? This is an off-line upgrade, and apparently work has not even started - r the new bridge itself will, presumably, be the biggest part of the job. It must be years before the approaches to the new bridge need to be started, and even longer before they are tied in to the existing roads.
It's for the installation of the Intelligent Transport System (ATM) gantries on the existing A90, which will be a part of the overall scheme.
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owen b
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Re: Forth Replacement Crossing

Post by owen b »

"Coast" on BBC2 just now has had an excellent piece on the structural problems with the existing bridge. It's a repeat, so it's out of date regarding recent developments, but a good non-technical explanation and some vertigo inducing film.
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Re: Forth Replacement Crossing

Post by djw1981 »

t1(M) wrote:
WHBM wrote:
Rain wrote:It's not just learners, pedestrians/cyclists will have to rely on a special bus service over the new bridge once the old bridge is demolished 12 months or so after the new one opens.
Why ? There is a perfectly adequate train servce between the two sides of the estuary.



What if I want to take a tandem across the firth on New Year's Day?
East Coast will be tehre with their HST to Aberdeen.
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A935
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Re: Forth Replacement Crossing

Post by A935 »

No East Coast services north of Edinburgh on Ne'ers Day..
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Klaxon
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Re: Forth Replacement Crossing

Post by Klaxon »

Could really do with ATM on the south side as well - all the way from Newbridge and Cramond Brig out to the bridge. Enforced limits might help the flow of traffic a bit :twisted:
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Burns
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Re: Forth Replacement Crossing

Post by Burns »

Trebeck wrote:And the occasional driver doing 60mph, slowing to 40 as they drive past the cameras :roll:
I had someone fly past me earlier then slam on their breaks and drive at 35 through the works. Thankfully overtaking them again was an easy feat.

Are we getting hard shoulder running with this project or just variable speed limits on the current running lanes?
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stu531
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Re: Forth Replacement Crossing

Post by stu531 »

Surely, given the short distance between the end of the M9 spur and the supposed start of the new bridge carriageway, it will be continuous motorway?

Looking on OSM here, there would be what - 600 yards or so of gap between the two stretches.

Likely that we'll see an M90 joined to the rest of the network?
Trebeck
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Re: Forth Replacement Crossing

Post by Trebeck »

stu531 wrote:Surely, given the short distance between the end of the M9 spur and the supposed start of the new bridge carriageway, it will be continuous motorway?

Looking on OSM here, there would be what - 600 yards or so of gap between the two stretches.

Likely that we'll see an M90 joined to the rest of the network?
Would have made sense at the time of extending the M9 spur to have redirected it to the left of Dundas Castle.

Traffic from the M8 will have to follow a bit of an S shape to get to the new bridge.
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Mark Hewitt
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Forth Replacement Crossing

Post by Mark Hewitt »

Is that alignment out of the question now?
booshank
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Re: Forth Replacement Crossing

Post by booshank »

Trebeck wrote:Would have made sense at the time of extending the M9 spur to have redirected it to the left of Dundas Castle.

Traffic from the M8 will have to follow a bit of an S shape to get to the new bridge.
The whole arrangement of roads south of the Forth Road Bridge looks rather odd, especially the dogleg in the A90-A8000
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Re: Forth Replacement Crossing

Post by Glen »

Trebeck wrote:Would have made sense at the time of extending the M9 spur to have redirected it to the left of Dundas Castle.

Traffic from the M8 will have to follow a bit of an S shape to get to the new bridge.
But the M9 spur was built to connect to the existing bridge, the second crossing wasn't confirmed to be going ahead at the time.
One of the proposed links to the FRC did included a new motorway to link to the M9 at a new junction further west than 1a on a more direct route.

booshank wrote:The whole arrangement of roads south of the Forth Road Bridge looks rather odd, especially the dogleg in the A90-A8000
The A8000 doesn't exist any more, some time after being superseded by the M9 spur extension it was reverted to B800 as it now only a local route.
The route of the M9 spur has to fit between M9 J1 and Echline Junction on the A90 and avoid Kirkliston, the slightly less than direct route is the only way this could be achieved.
booshank
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Re: Forth Replacement Crossing

Post by booshank »

Glen wrote:The A8000 doesn't exist any more, some time after being superseded by the M9 spur extension it was reverted to B800 as it now only a local route.
The route of the M9 spur has to fit between M9 J1 and Echline Junction on the A90 and avoid Kirkliston, the slightly less than direct route is the only way this could be achieved.
My fault for consulting Google Maps rather than Open Street Map!
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Bryn666
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Re: Forth Replacement Crossing

Post by Bryn666 »

Glen wrote:
Trebeck wrote:Would have made sense at the time of extending the M9 spur to have redirected it to the left of Dundas Castle.

Traffic from the M8 will have to follow a bit of an S shape to get to the new bridge.
But the M9 spur was built to connect to the existing bridge, the second crossing wasn't confirmed to be going ahead at the time.
One of the proposed links to the FRC did included a new motorway to link to the M9 at a new junction further west than 1a on a more direct route.

booshank wrote:The whole arrangement of roads south of the Forth Road Bridge looks rather odd, especially the dogleg in the A90-A8000
The A8000 doesn't exist any more, some time after being superseded by the M9 spur extension it was reverted to B800 as it now only a local route.
The route of the M9 spur has to fit between M9 J1 and Echline Junction on the A90 and avoid Kirkliston, the slightly less than direct route is the only way this could be achieved.
It also follows the railway, meaning less severance of rural land. It does look stupid on a map though...
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