Complete list of single-carriageway motorways

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ais523
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Complete list of single-carriageway motorways

Post by ais523 » Mon Aug 22, 2016 04:35

I see various comments about single-carriageway motorways on roads enthusiast sites. CBRD's FAQ implies that the A6144(M) was the only single-carriageway motorway before it was downgraded, but I'm pretty sure that's not actually the case.

Searching Pathetic Motorways, I got the following list of motorways whose mainline contains single carriageway sections: M58, A38(M), A601(M), M12(NI, only for a few metres)
If we count bidirectional sliproads, we also have: M53 (J6 spur), M876 (J1 sliproad)

I'm not so sure about the A38(M), because it's got major roadworks at the moment and it tends to be given a small plastic central barrier during times of roadworks so that there's somewhere to put the yellow signs. I need to get up there at some point to see how many carriageways it has at the moment. (It is usually single-carriageway, though.)

Anyway, I have a feeling that there are some single-carriageway motorways that I missed above, and it seems quite likely that SABRE will know. So, which motorways are missing from the list? Are any of the listed ones incorrect?

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Re: Complete list of single-carriageway motorways

Post by WHBM » Mon Aug 22, 2016 07:22


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Re: Complete list of single-carriageway motorways

Post by PeterA5145 » Mon Aug 22, 2016 07:55

There's also the Walton Summit Motorway, of course :D

M40 Junction 12 at Gaydon has bi-directional slip roads under motorway regulations - I'm sure there must be more.
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Re: Complete list of single-carriageway motorways

Post by crb11 » Mon Aug 22, 2016 08:07

M50 J1 is another with bidirectional sliproads.
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Re: Complete list of single-carriageway motorways

Post by Owain » Mon Aug 22, 2016 08:21

PeterA5145 wrote:There's also the Walton Summit Motorway, of course :D

M40 Junction 12 at Gaydon has bi-directional slip roads under motorway regulations - I'm sure there must be more.
As were the slips on Lancaster's infamous M6 J34, although that's all being changed now, of course.

crb11 wrote:M50 J1 is another with bidirectional sliproads.
And the equally infamous M50 J3, which doesn't even have traffic islands where it meets the main line of the motorway.
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Re: Complete list of single-carriageway motorways

Post by Bryn666 » Mon Aug 22, 2016 08:50

The M876 has a single carriageway slip road near Falkirk, as does the M80 at Old Inns.
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Re: Complete list of single-carriageway motorways

Post by Chris5156 » Mon Aug 22, 2016 09:16

There are also single carriageway slips on the M25 J18 and the A404(M) at J9A.

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Re: Complete list of single-carriageway motorways

Post by WHBM » Mon Aug 22, 2016 09:19

On a related theme here's a well-used footpath crossing a Motorway

https://www.google.co.uk/maps/@51.49243 ... 312!8i6656

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Re: Complete list of single-carriageway motorways

Post by ais523 » Mon Aug 22, 2016 09:56

The other sliproad at M1 J6 also counts, and is even worse (given that the motorway regulations have to start late to fit a priority junction onto it).

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Re: Complete list of single-carriageway motorways

Post by Steven » Mon Aug 22, 2016 11:39

ais523 wrote:CBRD's FAQ implies that the A6144(M) was the only single-carriageway motorway before it was downgraded, but I'm pretty sure that's not actually the case.
It was the only entirely single-carriageway motorway.
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Re: Complete list of single-carriageway motorways

Post by Owain » Mon Aug 22, 2016 12:21

WHBM wrote:On a related theme here's a well-used footpath crossing a Motorway

https://www.google.co.uk/maps/@51.49243 ... 312!8i6656
I think motorway regulations apply (just!) where pedestrians are allowed to cross this slip road.
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Re: Complete list of single-carriageway motorways

Post by Steven » Mon Aug 22, 2016 12:24

If you're on about footpaths across motorways, there's a famous on across the M876 at J2.
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Re: Complete list of single-carriageway motorways

Post by paully » Mon Aug 22, 2016 12:38

M8 J5 also has a bi-directional sliproad, and a strange set of at-grade junctions on both sides to allow access to the guest house.
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Re: Complete list of single-carriageway motorways

Post by rileyrob » Mon Aug 22, 2016 16:10

I have collated those listed so far on the Wiki here: Single Carriageway Motorway. please feel free to add, amend, etc!
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From the SABRE Wiki: Single Carriageway Motorway :

REDIRECT [[List of Single Carriageway

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Re: Complete list of single-carriageway motorways

Post by kit » Mon Aug 22, 2016 17:22

WHBM wrote:On a related theme here's a well-used footpath crossing a Motorway

https://www.google.co.uk/maps/@51.49243 ... 312!8i6656
It is weird that one is tacitly encouraged by barrier placement when there is a ped bridge just 100 metres further down. Shows how pedestrian unfriendly ped bridges can be!
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Re: Complete list of single-carriageway motorways

Post by wrinkly » Mon Aug 22, 2016 17:43

I would change "single carriageway" to "two-way" where it relates to slip roads, as a normal slip road is a one-way single carriageway.

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Re: Complete list of single-carriageway motorways

Post by M5Lenzar » Mon Aug 22, 2016 18:04

kit wrote: It is weird that one is tacitly encouraged by barrier placement when there is a ped bridge just 100 metres further down. Shows how pedestrian unfriendly ped bridges can be!
Or how laziness friendly our culture has become...

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Re: Complete list of single-carriageway motorways

Post by wrinkly » Mon Aug 22, 2016 18:18

Would you count M5 J5?

There's a single-carriageway two-way section but does it count as part of a slip road?

Also (unrelated to the thread) what's the disturbed ground in the satellite view inside the western loop?

M74 J11 is similar (and also has a dual carriageway giving way to the slip road).

M8 J5 already mentioned is similar except that it's a private access rather than a public road. The slip roads on the motorway side of the junction with the private access are one-way.

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Re: Complete list of single-carriageway motorways

Post by Stevie D » Mon Aug 22, 2016 18:55

wrinkly wrote:Would you count M5 J5?

There's a single-carriageway two-way section but does it count as part of a slip road?
No, motorway restrictions (and therefore the slip road) end where the side road joins and the road becomes two-way.

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Re: Complete list of single-carriageway motorways

Post by kit » Mon Aug 22, 2016 19:00

M5Lenzar wrote:Or how laziness friendly our culture has become...
I think it's widely accepted in highway design that if you try to block desire lines for any mode of transport too much they will just find a way through on a less suitable route. It's not lazy unless "rat running" drivers are lazy too.

Speaking as someone who walks with a pushchair a lot pedestrian bridges are quite crazily unfriendly for those with pushchairs, wheelchairs or with limited mobility. One of my often-used routes has a bridge over the raiways with five sets of stairs which is a nightmare. (Of course with railways you can't safely wiggle a way around!)
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