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The new Jn 11 M6 involves the complete demolition of the existing bridges, and installation of two new ones on a larger diameter roundabout. Surely this must cost almost the same as putting in at least a part-free flow junction ? Can it be the same designer who was responsible for the dreadful Switch Island up near Liverpool !
Its yet another spatchcock, but a very expensive one !
Looks like the M54 J1 design separates trunk from local traffic so cycling around it should be less daunting despite making the journey three small roundabouts instead of one big one. These sorts of schemes tend to make the footpaths shared use as well for those who are really scared.
The freeflow design bypassed the existing roundabout (see plan I posted on previous page). It would have been much less disruptive than the selected design, which requires demolition of the existing junction.Patrick Harper wrote: ↑Thu Jul 29, 2021 21:31Well the current roundabout is only two lanes wide + footpaths, if the plan for the new roundabout is for a wider circular carriageway plus filter lanes then that's still an improvement, and a less disruptive one than full freeflow would be to the area. Assuming they've setup their traffic modelling software correctly and they're choosing a design with regards to the stats generated from that, it's probably fine.
Remarkably there are not even any freeflow filter lanes in the selected design, nor any potential for any as they've put the old A460 between the link road and north facing onslip.
You have a lot of faith in the software. It's not an objective judge but a slave to the selected parameters and inputs. Usually the target is to keep the junction within 'capacity' at peak times. This is defined so it can be (and with this design, is bound to be) achieved with substantial queues. Furthermore, offpeak and interpeak journey times are usually treated as a 'don't care'. See HE's own metastudy of dozens of pinchpoint schemes, which found that average journey times usually increased. The modelling is basically rigged to deliver this dire outcome of a massively wide, fully signalized roundabout.
This is true, but not good enough any more, IMO. Shared footpaths that are used for cyclists are a terrible compromise. HE has a vast budget and even dedicated spending for improvements to NMU provision; they should be working towards dedicated cycle facilities on all their schemes. That applies more than anywhere else in a situation like this where you’re going to see a whole junction ripped up and rebuilt - it’s an opportunity to make real improvements that won’t be repeated. Fail to provide properly for NMUs now and it will be difficult to ever add provision for them later.
What is it with DfT and their reluctance to designate new motorways?
A link between two moorways is, err, an APDC?
Sorry, I meant "Non-Motorway Traffic" or NMT
If HE budget was that vast we wouldn't have an at grade solution being pushed in the first place.Chris5156 wrote: ↑Fri Jul 30, 2021 08:15This is true, but not good enough any more, IMO. Shared footpaths that are used for cyclists are a terrible compromise. HE has a vast budget and even dedicated spending for improvements to NMU provision; they should be working towards dedicated cycle facilities on all their schemes. That applies more than anywhere else in a situation like this where you’re going to see a whole junction ripped up and rebuilt - it’s an opportunity to make real improvements that won’t be repeated. Fail to provide properly for NMUs now and it will be difficult to ever add provision for them later.
The simple truth is, like most things in this country, the Government tries to do things on a shoestring (so it can claim to keep taxes low) while simultaneously diverting huge chunks of valuable taxpayers cash (which could be spent actually doing things) down the trousers of their outsourcing friends by stripping Government bodies of all expertise to do things in house.
HE have effectively been reduced to an uninformed commissioning agent with precious little engineering talent or vision within. They say to a contractor "this is the budget - go and give me a solution which can be built within it (with minimal landtake so we can minimise trouble from the neighbours / protest lobby)". Back comes the contractor with an at grade design festooned with traffic lights (and which they will claim makes the design NMU friendly) and some computer models which say it will just about work and the HE PR machine goes into overdrive about how wonderful they (HE) are for coming up with such a excellent design.