Highway Plans SABRE Maps layer

Talk about items you find on SABRE Maps - interesting features, historic road layouts etc. Also contains announcements of new maps available on SABRE Maps.

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Steven
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Re: Highway Plans SABRE Maps layer

Post by Steven »

Another map has gone up from Truvelo's pen.

This time it's the M4 Newport Southern Bypass from 2018.
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Bryn666
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Re: Highway Plans SABRE Maps layer

Post by Bryn666 »

Steven wrote: Sat Oct 28, 2023 20:57 Another map has gone up from Truvelo's pen.

This time it's the M4 Newport Southern Bypass from 2018.
That junction at Magor looks even sillier in neatly drawn form.
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Truvelo
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Re: Highway Plans SABRE Maps layer

Post by Truvelo »

Bryn666 wrote: Thu Nov 02, 2023 16:00
Steven wrote: Sat Oct 28, 2023 20:57 Another map has gone up from Truvelo's pen.

This time it's the M4 Newport Southern Bypass from 2018.
That junction at Magor looks even sillier in neatly drawn form.
And I thought it was policy not to build junctions with an exit slip for which there is no equivalent onslip for the opposite direction.
How would you like your grade separations, Sir?
Big and complex.
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Re: Highway Plans SABRE Maps layer

Post by Bryn666 »

Truvelo wrote: Thu Nov 02, 2023 19:18
Bryn666 wrote: Thu Nov 02, 2023 16:00
Steven wrote: Sat Oct 28, 2023 20:57 Another map has gone up from Truvelo's pen.

This time it's the M4 Newport Southern Bypass from 2018.
That junction at Magor looks even sillier in neatly drawn form.
And I thought it was policy not to build junctions with an exit slip for which there is no equivalent onslip for the opposite direction.
Limited access junctions aren't forbidden, but they are discouraged where they could cause navigational and network usability issues.
Bryn
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Chris5156
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Re: Highway Plans SABRE Maps layer

Post by Chris5156 »

I can’t really see why there wouldn’t be a corresponding westbound on-slip - there’s an existing road crossing the motorway so a sliproad could have linked to that. It’s very odd.
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Truvelo
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Re: Highway Plans SABRE Maps layer

Post by Truvelo »

That slip road was a last minute addition. The earlier plans didn't have it.
How would you like your grade separations, Sir?
Big and complex.
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Re: Highway Plans SABRE Maps layer

Post by Mapper89062 »

I'd assume it's because the offslip fits in easily between the new M4 and realigned A4810 and links into a junction required anyway, while an onslip would require purchasing of extra land east of the roads and a new roundabout to be built.

The space might also be land earmarked as housing development given its proximity to the edge of Magor.
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Steven
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Re: Highway Plans SABRE Maps layer

Post by Steven »

Thanks to the research skills of Truvelo, he's allowed us to bring to SABRE Maps another of the unrealised plans from the archive.

This release is the Deeside Improvement from 2020.
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Re: Highway Plans SABRE Maps layer

Post by Bryn666 »

Steven wrote: Wed Jan 31, 2024 08:23 Thanks to the research skills of Truvelo, he's allowed us to bring to SABRE Maps another of the unrealised plans from the archive.

This release is the Deeside Improvement from 2020.
Surprisingly less new road needed to make that happen than I had thought!
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Re: Highway Plans SABRE Maps layer

Post by c2R »

Bryn666 wrote: Sun Feb 04, 2024 22:59
Steven wrote: Wed Jan 31, 2024 08:23 Thanks to the research skills of Truvelo, he's allowed us to bring to SABRE Maps another of the unrealised plans from the archive.

This release is the Deeside Improvement from 2020.
Surprisingly less new road needed to make that happen than I had thought!
Indeed... This one I'd have thought would be something of a no brainer, especially given satnavs direct you that way anyway and along kelsterton lane when traffic is bad on the 494 through aston
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Re: Highway Plans SABRE Maps layer

Post by Truvelo »

It would have made the upgrading of the A494 south of Shotwick 15 years ago to full D3M standard redundant.
How would you like your grade separations, Sir?
Big and complex.
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Re: Highway Plans SABRE Maps layer

Post by Bryn666 »

Truvelo wrote: Tue Feb 06, 2024 20:50 It would have made the upgrading of the A494 south of Shotwick 15 years ago to full D3M standard redundant.
The A494 is a classic example of "do it all or don't bother". A longer length of the widened bit has been painted back down to 2 lanes because the lane drop was causing more problems than it solved being right at a merge point with a slip road as well. The lane drop is now before the A548 GSJ.
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Re: Highway Plans SABRE Maps layer

Post by Truvelo »

That seems to be the case where long sections of road are upgraded such as the smartification of the M1 and M6 which were done in separate sections. As for the A494 I wasn't aware it had been hatched down to two lanes but the latest GSV shows it was done last summer. It also shows this section which is wide enough for six lanes now only has one third of the carriageway in use. The rest of the asphalt is now sitting idle.
How would you like your grade separations, Sir?
Big and complex.
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