Manchester south-east junction improvements

The study of British and Irish roads - their construction, numbering, history, mapping, past and future official roads proposals and general roads musings.

There is a separate forum for Street Furniture (traffic lights, street lights, road signs etc).

Registered users get access to other forums including discussions about other forms of transport, driving, fantasy roads and wishlists, and roads quizzes.

Moderator: Site Management Team

Post Reply
User avatar
jackal
Member
Posts: 6636
Joined: Tue Jan 08, 2008 23:33
Location: M6

Manchester south-east junction improvements

Post by jackal » Thu Oct 21, 2021 13:27

This is an RIS3 pipeline scheme. Little information is available but a TfN document refers to it as "formerly M60 J24-27 and 1-4 smart motorway". This was an RIS1 scheme described as follows: "upgrading south-eastern quadrant of the M60 to Smart Motorway between junction 24 (M67 Denton interchange) and junction 4 (M56 Kingsway interchange)".

I've not seen any public explanation of the name change, or why the scheme has slid back at least ten years (from construction to start 2015-20 to maybe starting 2025-30). Though to be fair I would prefer that they delay rather than build a pointless version of the scheme like M60 J12-18 smart motorway.

On its face there are obvious problems with both junction design and mainline capacity on this section. Most notably, a braiding-type solution is needed for J2-3, and there is an offside entry at J25. As discussed previously, ALR is difficult at J27-1, though maybe not impossible with some creativity. As Bryn mentions, sightlines are a constraint. I'm concerned that, with the name change, the scheme may have been scaled back to some minor changes to junctions, when increased mainline capacity is clearly required (see data below).

Road Junctions Standard HGVs All motor vehicles
M60 3 2 D4M 7714 163291
M60 2 1 D3M 8634 153636
M60 1 27 D3 7452 135796
M60 27 26 D3M 7860 116471
M60 26 25 D3M 6713 125971
M60 25 24 D3M 7433 136088

Some previous relevant discussion in this thread: viewtopic.php?f=1&t=28573&p=1146778#p1146778

User avatar
Bryn666
Member
Posts: 32091
Joined: Thu Jun 20, 2002 20:54

Re: Manchester south-east junction improvements

Post by Bryn666 » Thu Oct 21, 2021 14:11

Braiding between 2-3 would be a the ultimate solution for me, the D4 section here was recently extended to try and provide more weaving space but the issue is the length is too short to begin with. If braiding is impossible then a lesser optimised solution would be to replace the J2 exit fork with a loop, which could extend the 4 lane section by a further 400 metres and allow weaving to be along an 800 metre section. Given widening the M60 for braiding also involves replacing the Manchester Road overbridge as well as multiple structures this loop could be a much cheaper fix, but the trade off is it's a new loop and DMRB gets very twitchy about these unless they're gigantic - but a 50m radius loop would be similar size to the existing M56 entry loop at J3. Alternatively the existing skew structure across the M60 for the Roscoe's Spur could be incorporated and this would allow a more curvaceous off slip.

Sell it as a safety scheme by removing needless choke and conflict points, and there's the makings of a very good project - but we still need the A555.

Here's a horribly cheap sketch:
Attachments
Roscoes Loop.jpg
Bryn
Traffic/Road Safety Dogsbody and General Grumpy Now-a-Thirtysomething Man
She said life was like a motorway; dull, grey, and long.

Blog - https://showmeasign.online/

User avatar
jackal
Member
Posts: 6636
Joined: Tue Jan 08, 2008 23:33
Location: M6

Re: Manchester south-east junction improvements

Post by jackal » Thu Oct 21, 2021 14:53

Eastbound you can actually run the A34 slip around the top of the fork for a cost effective braiding-level solution.

Westbound is trickier - ideally you'd use braiding, but I've just sketched some C/D lanes, which would still be a big improvement as the main issue is taking the weaving off the mainline.

M60 J2-3 - Copy.jpg

(Now includes the link between A34 and Roscoe's spur that you'd suggested when I last posted this.)

User avatar
Bryn666
Member
Posts: 32091
Joined: Thu Jun 20, 2002 20:54

Re: Manchester south-east junction improvements

Post by Bryn666 » Thu Oct 21, 2021 15:33

jackal wrote:
Thu Oct 21, 2021 14:53
Eastbound you can actually run the A34 slip around the top of the fork for a cost effective braiding-level solution.

Westbound is trickier - ideally you'd use braiding, but I've just sketched some C/D lanes, which would still be a big improvement as the main issue is taking the weaving off the mainline.


M60 J2-3 - Copy.jpg


(Now includes the link between A34 and Roscoe's spur that you'd suggested when I last posted this.)
That's quite feasible too! The westbound weaving is less of a concern as officially that is supposedly a popular movement (J2-3 are close because they function as a Cheadle bypass anyway).
Bryn
Traffic/Road Safety Dogsbody and General Grumpy Now-a-Thirtysomething Man
She said life was like a motorway; dull, grey, and long.

Blog - https://showmeasign.online/

User avatar
jackal
Member
Posts: 6636
Joined: Tue Jan 08, 2008 23:33
Location: M6

Re: Manchester south-east junction improvements

Post by jackal » Thu Oct 21, 2021 16:34

Just noticed my drawing is rubbish westbound as it creates a new weaving space up to the M56. Whoops. But equally I don't think it can be left as is (500m weaving space on 160k AADT road).

One option is to extend the C/D lane up to the loop for A34>M56, which it would join as a lane gain. But Roscoe spur traffic then cannot access the M60 (it can access the A34 and M56).

Otherwise braiding is required - specifically the offslip heading for the A34 has to diverge east of the fork, near the allotments, then go under Roscoe spur.

Post Reply