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Old September 23rd, 2017, 12:07 PM   #4461
Ryme Intrinseca
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Ramp metering at a freeflow interchange

There is a strange scheme being built at the M6/M62 Croft Interchange to introduce ramp metering (with signals) on the slip roads joining the eastbound M62. I was wondering what the international perspective on this was, and if there are equivalent ramp metering schemes at otherwise freeflow interchanges in other countries?

To me it seems a waste of £12.6m and they'd be better off addressing the cause of the congestion rather than the symptom, e.g. through a cheap widening of the M62 eastbound using the hard shoulder.

Last edited by Ryme Intrinseca; September 23rd, 2017 at 12:24 PM.
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Old September 23rd, 2017, 12:17 PM   #4462
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While ramp metering is common in quite a number of countries, it seems extremely rare on free flow motorway-to-motorway interchanges. The Netherlands experimented with it on the A15/A50 interchange, but it was removed after A50 was expanded to eight lanes.

Though metering is pretty common at tunnels, even when there is no capacity reduction.
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Old September 23rd, 2017, 12:43 PM   #4463
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Yes, I thought it was unusual, though interesting to hear it's not the first - and indeed that widening was the ultimate solution.
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Old September 23rd, 2017, 03:23 PM   #4464
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I wonder if some U.S. cities have also used metering on freeway-to-freeway ramps. Some cities have a large number of ramp meters.
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Old September 23rd, 2017, 03:28 PM   #4465
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I've never heard of one, although I don't claim exhaustive knowledge. The risk of causing it at least worsening backups on the freeway people are leaving seems to be an obvious problem.
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Old September 24th, 2017, 11:43 AM   #4466
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Quote:
Originally Posted by ChrisZwolle View Post
I wonder if some U.S. cities have also used metering on freeway-to-freeway ramps. Some cities have a large number of ramp meters.
US-101 to SR-85 on the southside of San Jose, California. I'm not sure if it's actually in use, but it's there.

edit: the other on-ramp in that interchange in the same direction has one too.
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Old September 26th, 2017, 11:32 PM   #4467
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The Welsh government have announced the red route as the preferred option for the Deeside Corridor scheme. Their description:
  • A new 13km two-lane dual carriageway, linking the A55-A5119 Northop Junction (Junction 33) with the A494 and A550 north of Deeside Parkway Junction, via Kelsterton Interchange and the Flintshire Bridge. This option is partly online improvement and partly new alignment.
  • The scheme increases capacity along the existing A548, includes modifications and improvements to junctions and provides a new section of road between the A548 and the A55.
They are still talking about this as a £250m scheme, which in UK terms seems very cheap for the scale of works. I suspect this may be due to differences in discount rates applied to costings by the Welsh Government and Highways England - they make a big difference given the severe construction inflation in recent years.



http://gov.wales/topics/transport/ro...-a548/?lang=en
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Last edited by Ryme Intrinseca; September 26th, 2017 at 11:42 PM.
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Old September 29th, 2017, 12:54 AM   #4468
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Quote:
Originally Posted by ChrisZwolle View Post
I wonder if some U.S. cities have also used metering on freeway-to-freeway ramps. Some cities have a large number of ramp meters.
In Milwaukee, WI on I-94 interchange with WI-341. The ramps from WI-341 to I-94 have meters. WI-341 is not a long major freeway however its interchange with I-94 is totally free flow and high speed (high speed if there weren't any meters). I'd post Google Streetview images if I knew how to.
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Old October 1st, 2017, 06:14 PM   #4469
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Scotland (x3.2) 8 of 13


Scotland (x3.2) 9 of 13
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Old October 8th, 2017, 12:46 AM   #4470
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Scotland - England (x3.4) 10 of 13

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Old October 8th, 2017, 02:14 PM   #4471
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Does anyone know if there are any future plans to widen or upgrade the A406 in London?
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Old October 8th, 2017, 05:16 PM   #4472
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There's possibly an upgrade for the really bad bit at Bounds Green still on the cards, and slim hopes of the single-carriageway bit between A4 and A40 being upgraded in the long term, but beyond that, there are absolutely no plans to widen or upgrade.
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Old October 10th, 2017, 04:14 AM   #4473
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Quote:
Originally Posted by sotonsi View Post
There's possibly an upgrade for the really bad bit at Bounds Green still on the cards, and slim hopes of the single-carriageway bit between A4 and A40 being upgraded in the long term
Do you have a source on that? I'd be very surprised to see anything beyond bus priority measures etc.
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Old October 10th, 2017, 02:19 PM   #4474
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Quote:
Originally Posted by Ryme Intrinseca View Post
I'd be very surprised to see anything beyond bus priority measures etc.
Which is still an upgrade.

I underestimated the desire to upgrade the A4-A40 bit, there's this short dualling scheme. The point is safety, and improved pedestrian/cycle facilities, but's it a widening nonetheless.

Pretty sure a major Bounds Green upgrade was among a recent big list of aspirations from TfL. The problem is that TfL have little money and really want to build an insanely expensive railway tunnel, so a road tunnel past a bottleneck is unlikely to happen. But as I said "possibly still on the cards".
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Old October 11th, 2017, 12:02 AM   #4475
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Quote:
Originally Posted by sotonsi View Post
Which is still an upgrade.

I underestimated the desire to upgrade the A4-A40 bit, there's this short dualling scheme. The point is safety, and improved pedestrian/cycle facilities, but's it a widening nonetheless.

Pretty sure a major Bounds Green upgrade was among a recent big list of aspirations from TfL. The problem is that TfL have little money and really want to build an insanely expensive railway tunnel, so a road tunnel past a bottleneck is unlikely to happen. But as I said "possibly still on the cards".
isn't this just another one of TfL's usual bullcrap about safety so they just decide to narrow lanes, reduce speed limits and create more havoc?
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Old October 12th, 2017, 04:32 PM   #4476
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The Mersey Gateway Bridge is to open tomorrow night. It's a tolled 2.3km, six lane cable-stayed bridge. Scheme costs of £600m include new and improved link roads and grade-separated junctions either side of the Mersey.

http://www.bbc.co.uk/news/uk-england-merseyside-41582616
http://www.merseygateway.co.uk/
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Old October 14th, 2017, 04:28 AM   #4477
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The bridge opened just after midnight UK time. Lots of people came out to drive it!



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Old October 14th, 2017, 05:16 PM   #4478
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Webcams showing progress on the Aberdeen bypass cosntruction:

https://www.transport.gov.scot/proje.../awpr-webcams/

It is fairly large project but it is hard to find any decent updates or photos. Try google it. Some news from a few months ago and that's it. It seems nobody is really interested in it.
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Old October 14th, 2017, 06:29 PM   #4479
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A lot of the scheme is in hard-to-get-to rural areas, and people who would take photos and the like all live a long way away, unlike schemes like the Inverness Western Link, SEMMMS, etc.

Also the online stuff from the authorities is very lacking - merely the minimum statutory requirements.

Looking at the cameras, I'm struggling to see how it will be finished by Spring.
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Old October 21st, 2017, 11:20 AM   #4480
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Quote:
Originally Posted by sotonsi View Post
A lot of the scheme is in hard-to-get-to rural areas, and people who would take photos and the like all live a long way away, unlike schemes like the Inverness Western Link, SEMMMS, etc.

Also the online stuff from the authorities is very lacking - merely the minimum statutory requirements.

Looking at the cameras, I'm struggling to see how it will be finished by Spring.
I just found that Iain Henderson has great album on Flickr:
https://www.flickr.com/photos/iainh1...49458723/page7

Just two samples of his excelent work:

September 2017: Work on the AWPR (Aberdeen Western Peripheral Route) Aberdeen bypass dual carriageway River Dee bridge at Milltimber
by Iain Henderson, on Flickr

I didn't know they will use concrete surface. It seems rare nowadays in the UK:

September 2017: Work on the AWPR (Aberdeen Western Peripheral Route) Aberdeen bypass dual carriageway at Newlands Farm on Cleanhill to Charleston section of road
by Iain Henderson, on Flickr
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