A46 Coventry Junctions upgrade
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Re: A46 Coventry Junctions upgrade
The French junction has a 50km/h speed limit which would be another issue.
- Alderpoint
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Re: A46 Coventry Junctions upgrade
That's quicker than you can go around the Walsgrave roundabout at the moment.
IMO (going through there twice a day when I go to to the office), N to S could be done by new lanes to the east of the existing roundabout although land-grab would need to minimised. In the opposite direction, a flyover over the top of the existing roundabout should be feasible. Okay, this is not result in a NSL junction, but that doesn't seem to be a problem these days (e.g. the 50mph Toll Bar upgrade).
Alternative would be to close the existing junction totally and provide a new GSJ half a mile to the north to serve B4082 and also provide direct access into the back of the hospital. Probably too radical....
Let it snow.
Re: A46 Coventry Junctions upgrade
Here there's not much point in elaborate layouts that compromise the mainline like that French one. Just take the A46 through on the smoothest line you can, then stick in a three arm dumbbell or diamond (with retaining walls to save space). This gives a higher speed limit for the mainline and no right hand entry/exit.
Re: A46 Coventry Junctions upgrade
Re: mattling's suggestion, you can move the "straight on" that's a left turn (when driving on the left; right turn in the French example) to the inside of the junction rather than the outside, while keeping the geometry otherwise the same; then you just end up with a regular trumpet, with all the entries and exits on the correct sides of the road. The only real downside to this is that you end up with a merge/diverge (depending on which way round you build the junction) on the inside of a fairly sharp bend, which might be a safety issue in its own right; that's presumably why the example above sends the straight-on around the outside of the junction instead.
Re: A46 Coventry Junctions upgrade
Beams are being lifted for the Binley grade separation this weekend, with lots of disruption:
https://www.bbc.co.uk/news/uk-england-c ... e-59510056
I believe there has been some delay with it due to poor weather.
DfT info indicates that the Walsgrave contract is being procured at £43.8m, so a bit less than Binley, which was £61m. This suggests they are going for a relatively straightforward layout with only a single bridge.
https://www.bbc.co.uk/news/uk-england-c ... e-59510056
I believe there has been some delay with it due to poor weather.
DfT info indicates that the Walsgrave contract is being procured at £43.8m, so a bit less than Binley, which was £61m. This suggests they are going for a relatively straightforward layout with only a single bridge.
Re: A46 Coventry Junctions upgrade
From what I was told they recovered the time lost due to the wind and its all ok for next weekend's closure.
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Re: A46 Coventry Junctions upgrade
Drove along the A46 to Coventry this weekend, and at the start of the closure there were "road closed" signs as you would expect, but in addition there are no cycling, no pedestrians & no horses signs on both carriageways. Just though I'd point that out since I've never seen road works signed this way before - although I does make total sense since a "road closed" sign does only apply to motor vehicles.
- Alderpoint
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Re: A46 Coventry Junctions upgrade
The no cycling, no pedestrians & no horses signs have been there for months (probably since the start of the works but I wasn't going that way then).jervi wrote: ↑Tue Dec 07, 2021 09:36 Drove along the A46 to Coventry this weekend, and at the start of the closure there were "road closed" signs as you would expect, but in addition there are no cycling, no pedestrians & no horses signs on both carriageways. Just though I'd point that out since I've never seen road works signed this way before - although I does make total sense since a "road closed" sign does only apply to motor vehicles.
The A465 Heads of the Valley road through Clydach gorge was signposted no cycling throughout the roadworks - but uphill only!
I came through this morning and the half of the main beams are installed (presumably the remainder next weekend). It's going to be a big flyover - reminds me somewhat of Stonebridge.
Let it snow.
Re: A46 Coventry Junctions upgrade
Yes, it's a multispan bridge across the roundabout. They were planning to use retaining walls for the central section but there was a bit of pushback about creating a barrier across the junction. The long flyover opens things up a bit more for NMUs and (though they didn't say it) gives options for future layout changes such as hamburgerisation. There's not the space for the planted embankments you see at larger GSJs.
Re: A46 Coventry Junctions upgrade
Or, in a parallel universe where elaborate signalisation of roundabouts isn’t the only game in town, a SPUI or a diverging diamond…
Chris
Roads.org.uk
Roads.org.uk
- JammyDodge
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Re: A46 Coventry Junctions upgrade
Tell that to Durham CC, with the monstrosities they made where the A690 meets the A691 and where the A690 meets the New Elvet Bridge
Just
Designing Tomorrow, Around the Past
Re: A46 Coventry Junctions upgrade
Those provide absolutely none of the benefits of anything, that hamburger ar the first example can fit a single car in it.JammyDodge wrote: ↑Thu Dec 09, 2021 20:17Tell that to Durham CC, with the monstrosities they made where the A690 meets the A691 and where the A690 meets the New Elvet Bridge
Just
Why not just have a conventional signal controlled crossroads which would at least have allowed pedestrians and cyclists to get across in one piece as well?
Traffic engineers that know nothing about traffic trying to be clever once again.
Bryn
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Terminally cynical, unimpressed, and nearly Middle Age already.
She said life was like a motorway; dull, grey, and long.
Blog - https://showmeasign.online/
X - https://twitter.com/ShowMeASignBryn
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- JammyDodge
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Re: A46 Coventry Junctions upgrade
That's literally my question. A regular intersection would arguably function better and be less confusing and be more aesthetically pleasingBryn666 wrote: ↑Mon Dec 13, 2021 23:59Those provide absolutely none of the benefits of anything, that hamburger ar the first example can fit a single car in it.JammyDodge wrote: ↑Thu Dec 09, 2021 20:17Tell that to Durham CC, with the monstrosities they made where the A690 meets the A691 and where the A690 meets the New Elvet Bridge
Just
Why not just have a conventional signal controlled crossroads which would at least have allowed pedestrians and cyclists to get across in one piece as well?
Traffic engineers that know nothing about traffic trying to be clever once again.
These 2 junction have over 60 traffic lights, which is a stupid amount for 2 junctions both with 4 arms
Designing Tomorrow, Around the Past
Re: A46 Coventry Junctions upgrade
Fixation. There's already a roundabout in place so we must use as much of that as we can (otherwise it might look to the layman that the roundabout was a mistake, I mean, just look at all that land take).JammyDodge wrote: ↑Tue Dec 14, 2021 06:35That's literally my question. A regular intersection would arguably function better and be less confusing and be more aesthetically pleasingBryn666 wrote: ↑Mon Dec 13, 2021 23:59Those provide absolutely none of the benefits of anything, that hamburger ar the first example can fit a single car in it.JammyDodge wrote: ↑Thu Dec 09, 2021 20:17
Tell that to Durham CC, with the monstrosities they made where the A690 meets the A691 and where the A690 meets the New Elvet Bridge
Just
Why not just have a conventional signal controlled crossroads which would at least have allowed pedestrians and cyclists to get across in one piece as well?
Traffic engineers that know nothing about traffic trying to be clever once again.
These 2 junction have over 60 traffic lights, which is a stupid amount for 2 junctions both with 4 arms
Too often the designer doesn't seem able to take a step back, ignore the current form of the junction and just see each arm individually, each of a certain class and number of lanes, and then look to how best join up those lanes based on the traffic flows, keeping the whole thing compact and stoplines close together. It's a problem that seems endemic amongst engineers looking at the designs floating about out there.
- Alderpoint
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Re: A46 Coventry Junctions upgrade
All the main deck beams are now in place. I'm starting to believe the "Spring 2022" opening date.Alderpoint wrote: ↑Tue Dec 07, 2021 11:09 I came through this morning and the half of the main beams are installed (presumably the remainder next weekend).
Let it snow.
Re: A46 Coventry Junctions upgrade
A consultation on Walsgrave junction opens tomorrow. However, documents are now available here:
https://highwaysengland.citizenspace.co ... walsgrave/
Consultation brochure:
https://highwaysengland.citizenspace.co ... ochure.pdf
The preferred option is... a dumbbell about 800m north of the current roundabout. 50mph through the site of the current roundabout (a 70mph option was discounted). There's a lengthy list of alternatives that were discounted. Personally I don't think it's too bad (with the caveat that I know nothing about the area or turning traffic flows). It could've been worse... (like the rejected signalised T-junction )
https://highwaysengland.citizenspace.co ... walsgrave/
Consultation brochure:
https://highwaysengland.citizenspace.co ... ochure.pdf
The preferred option is... a dumbbell about 800m north of the current roundabout. 50mph through the site of the current roundabout (a 70mph option was discounted). There's a lengthy list of alternatives that were discounted. Personally I don't think it's too bad (with the caveat that I know nothing about the area or turning traffic flows). It could've been worse... (like the rejected signalised T-junction )
- Mapper89062
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Re: A46 Coventry Junctions upgrade
This looks like a decent solution given the constraints of the area and road alignments - I'd have liked the 70mph option, but it's a luxury, and a 50mph limit might have been necessary anyway given the weaving space to the M6 junction will be a bit tight. I'm relieved 3 (and also 1) were rejected quickly as well.
Looking at all the discarded options, the one obvious option that seems missing is LILOing the roundabout as in 7/8, but providing the missing movements via slips at the B4027 bridge, forming effectively a very large compact GSJ. Something like this:
This wouldn't be very practical given the weaving distance to the south, but I'm surprised it was never on the initial assessment at all.
Looking at all the discarded options, the one obvious option that seems missing is LILOing the roundabout as in 7/8, but providing the missing movements via slips at the B4027 bridge, forming effectively a very large compact GSJ. Something like this:
This wouldn't be very practical given the weaving distance to the south, but I'm surprised it was never on the initial assessment at all.
Just your average mapper, bringing you a map-focused take on today's world
- Alderpoint
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Re: A46 Coventry Junctions upgrade
Agreed, I guess the option for a full roundabout rather than a dumbell for the GSJ would result in too much land take. However I do hope 50mph limit does not end up going all the way between the end of the M69 and the A46/A45 Stivichall/Festival Island - not that anyone obeys the existing 50 limits thereaboutsMapper89062 wrote: ↑Mon Jan 10, 2022 21:11 This looks like a decent solution given the constraints of the area and road alignments - I'd have liked the 70mph option, but it's a luxury, and a 50mph limit might have been necessary anyway given the weaving space to the M6 junction will be a bit tight. I'm relieved 3 (and also 1) were rejected quickly as well.
This would have meant traffic to/from Walsgrave Hospital going along the residential section of Clifford Bridge Road south of the Sowe Bridge/Tescos roundabouts - it's busy enough there already.Looking at all the discarded options, the one obvious option that seems missing is LILOing the roundabout as in 7/8, but providing the missing movements via slips at the B4027 bridge, forming effectively a very large compact GSJ. Something like this:
tempsnip.png
This wouldn't be very practical given the weaving distance to the south, but I'm surprised it was never on the initial assessment at all.
Let it snow.
- SouthWest Philip
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Re: A46 Coventry Junctions upgrade
I can't see the land surrounding this new junction staying undeveloped for very long. It's clearly designed to allow other entrances to be tacked on. At least we've been spared another flat roundabout, Witney or Gloucester bypass style.
Re: A46 Coventry Junctions upgrade
I always expected it to be a dumbbell but I'm a bit disappointed about the 50mph limit. It's not exactly Air Balloon terrain. They claim the realignment for 70mph creates flooding risks but they only seem to have looked at one line. Still not a bad scheme.