Asymmetric Signed Routes

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the cheesecake man
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Asymmetric Signed Routes

Post by the cheesecake man » Fri Aug 27, 2021 13:45

Normally the signed routes from A to B and from B to A are the same except for one-way systems etc.

But not always...

If you arrive in Huddersfield on the A629 from Sheffield seeking the A629 to Halifax you are directed to turn left and use the southern side of the inner ring road (passing roads to Oldham and Rochdale on the way)

But if you arrive on the A629 from Halifax seeking the A629 to Sheffield you will also be advised to turn left, hence use the northern side of the inner ring road (passing roads to Bradford and Leeds).


If you are heading north on the M1 following directions to Huddersfield you will not take the A629 from junction 35 nor the A616 from junction 35A nor A61 from junction 36 nor A628 from junction 37. You will leave at junction 38 for the A637, which is the shortest route from the M1 to Huddersfield and joins the A629 in the Huddersfield suburbs.

But what happens if you are in Huddersfield wanting M1 South? Surprise surprise, you will not use the A637 to junction 38, you will take the A629 and A616 to junction 35A!

Why? Are there other examples?

PS Both of these examples involve the A629 and Huddersfield but I think that's a coincidence. But I could be wrong.

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Peter350
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Re: Asymmetric Signed Routes

Post by Peter350 » Fri Aug 27, 2021 14:39

Heading to Poole from the Ringwood direction, you are signposted via the A31 to Merley Roundabout then A349 to Holes Bay, but in the other direction the signs direct you via the A3049 and A348.

Also, between Shaftesbury and Blandford, southbound HGVs are signed via the higher unclassified road, in contrary to the A350 in the other direction.
Last edited by Peter350 on Fri Aug 27, 2021 15:53, edited 1 time in total.

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jervi
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Re: Asymmetric Signed Routes

Post by jervi » Fri Aug 27, 2021 14:41

Can't really think of an explanation for your examples other than the preferred route changed over time.
An example for near me is between Haywards Heath & Ardingly, although a local route as such I've always been puzzled at why it is sign posted different ways depending on the direction.
https://www.google.co.uk/maps/@51.00774 ... 384!8i8192 off the B2028 it is sign posted left to follow Summer Hill Lane / Portsmouth Lane / High Beech Lane / College Road to meet Ardingly back on the B2028.
But heading the other way, Haywards Heath is signposted back along the B2028. https://www.google.co.uk/maps/@51.04852 ... 384!8i8192

What makes it even more odd is that the ADS directs traffic for Turners Hill, South of England Showground (aka Ardingly Showground)& Wakehurst Place via the B2028, even though all of those destinations travel though Ardingly which is shown to be left...

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Re: Asymmetric Signed Routes

Post by jabbaboy » Fri Aug 27, 2021 20:30

Heading North up the A19, https://goo.gl/maps/ymzqG74ykVhT9iew5, heading towards Gateshead takes you via the A1231 / A1 / A184 but towards Newcastle via the Felling Bypass, through Gateshead town centre. Going the opposite direction both are taken along the Felling Bypass.

Imo it's wrong though it would make much more sense even knowing it would be more signage routing people like especially when they're trying to reduce traffic from the Tyne Bridge with the new LEZ etc.

A1231 / A1 - Newcastle (West, North, Centre), Gateshead (South + West)
A184 - Gateshead (Centre + East)
A1058 (Through Tunnel) - Newcastle (East)

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FleetlinePhil
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Re: Asymmetric Signed Routes

Post by FleetlinePhil » Sat Aug 28, 2021 09:13

the cheesecake man wrote:
Fri Aug 27, 2021 13:45
Normally the signed routes from A to B and from B to A are the same except for one-way systems etc.

But not always...

If you arrive in Huddersfield on the A629 from Sheffield seeking the A629 to Halifax you are directed to turn left and use the southern side of the inner ring road (passing roads to Oldham and Rochdale on the way)

But if you arrive on the A629 from Halifax seeking the A629 to Sheffield you will also be advised to turn left, hence use the northern side of the inner ring road (passing roads to Bradford and Leeds).


If you are heading north on the M1 following directions to Huddersfield you will not take the A629 from junction 35 nor the A616 from junction 35A nor A61 from junction 36 nor A628 from junction 37. You will leave at junction 38 for the A637, which is the shortest route from the M1 to Huddersfield and joins the A629 in the Huddersfield suburbs.

But what happens if you are in Huddersfield wanting M1 South? Surprise surprise, you will not use the A637 to junction 38, you will take the A629 and A616 to junction 35A!

Why? Are there other examples?

PS Both of these examples involve the A629 and Huddersfield but I think that's a coincidence. But I could be wrong.
I think the Huddersfield examples may be to reduce the amount of traffic making right turns onto and off the ring road, as I notice the A62 also follows the same pattern as the A629 in directing its through traffic to use the clockwise side. Entries to and exits from the ring road are naturally more straightforward if you use the ring road in a clockwise direction, but the A629 to/from Halifax is a particularly convoluted move if you use the anti-clockwise direction on the ring road.

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Re: Asymmetric Signed Routes

Post by Big L » Sat Aug 28, 2021 09:54

Heading south out of Derby, Stoke traffic is directed to use the A516 but only Derby (West) traffic should use it at the other end.
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the cheesecake man
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Re: Asymmetric Signed Routes

Post by the cheesecake man » Mon Sep 06, 2021 20:58

Those heading north on the A515 from Ashbourne seeking Monyash should turn take this unclassified road. Anyone in Monyash wanting A515 south to Ashbourne should stick to the B5055.

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Re: Asymmetric Signed Routes

Post by Gareth Thomas » Sun Sep 26, 2021 00:34

Traffic in Folkestone wanting to go to Canterbury is told to use the A2034 towards the M20, then join the A20 and come off at the next junction for the A260 and follow that towards Canterbury.

Coming the other way, traffic heading towards Folkestone is simply told to stay on the A260/A259 route.

Map of both routes.
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Re: Asymmetric Signed Routes

Post by Big L » Sun Sep 26, 2021 08:40

On the A41 between Wednesbury and Bilston, northbound traffic is told to stay on the A41, whereas southbound traffic is somewhat inexplicably sent on a detour.
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