Roads that start/end on a multiplex

dvboy · Post by **dvboy** » Wed May 07, 2008 15:31

The A158, at its western end, is a multiplex with the A15.

This to me seems a bit pointless, why not just start the A158 at the junction where it meets the A15?

Does anyone know of any other examples of a numbered road starting/ending as a multiplex?

timbucks · Post by **timbucks** » Wed May 07, 2008 15:54

Given that not all the signs have been removed, the A505 ends on a multiplex with the A4146 on the southern side of Leighton Buzzard. I think the plan is that it will start from about the third roundabout on the ring road (where the old A4146 crossed the A505)

A8000Bob · Post by **A8000Bob** » Wed May 07, 2008 16:27

A909 in Burntisland. I'm sure there was a thread on this before.

si404 · Post by **si404** » Wed May 07, 2008 17:02

A303 ends with a multiplex with the A30 to get to the M3
A33 ends with a multiplex with the A35 to get to the M271
A421 ends with a multiplex with the A428 to get to the A1
A140 ends with a multiplex with the A149 to get to Cromer
A494 ends with a multiplex with the A550 to get to the A548, for some reason!
A12 ends with a multiplex with the A102 to get to the A13, and a tiny bit further so that it ends in the middle of the junction.

The term for these is 'useless multiplex'

GrahamP · Post by **GrahamP** » Wed May 07, 2008 19:20

A8000_Bob wrote:A909 in Burntisland. I'm sure there was a thread on this before.

Well spotted. The A909 used to start by the docks and the train station (here: http://www.streetmap.co.uk/streetmap.dl ... 70&A=Y&Z=3), so if Cromwell Road really is still the A909 then it must have been truncated to the not-so-sensible end of Cromwell Road.

t1(M) · Post by **t1(M)** » Wed May 07, 2008 20:32

dvboy wrote:The A158, at its western end, is a multiplex with the A15.

This to me seems a bit pointless, why not just start the A158 at the junction where it meets the A15?

Does anyone know of any other examples of a numbered road starting/ending as a multiplex?

I wasn't aware that the A158's terminus is still in the south of the city - I'd assumed it was truncated when the A15 was diverted. Perhaps it's future-proofing: the A15 may be just visiting, if the eastern bypass is ever built.

One more that hasn't yet been mentioned is the A205, which starts at the Chiswick roundabout but multiplexes with the A315 as far as the north end of Kew Bridge. Presumably this is so that the NCR and SCR meet each other.

SouthWest Philip · Post by **SouthWest Philip** » Wed May 07, 2008 21:14

t1(M) wrote:I wasn't aware that the A158's terminus is still in the south of the city - I'd assumed it was truncated when the A15 was diverted. Perhaps it's future-proofing: the A15 may be just visiting, if the eastern bypass is ever built.

It isn't! The A158 runs along the bypass (or certainly did when the bypass first opened) until the A46 roundabout. This means the A15 in inferior in multiplex with the A158 then A46 (i.e. A158(A15), A46(A15)).

sgill77 · Post by **sgill77** » Wed May 07, 2008 23:24

As I've attempted to show here, there's an odd signed multiplex at Quinton with the B4043 and A458 sharing a short section of road before the B4043 forks off to the left. The multiplex is fully signed (in other words, the B4043 road number is not in brackets) on the flag sign at the roundabout.

However, I see no reason for the B4043 extending this far - except for the fact that, at various stages in its life, parts of the A458 and the entirety of the B4043 have been parts of the A456, which they meet at the roundabout.

multiraider2 · Post by **multiraider2** » Thu May 08, 2008 09:45

The A3071 ends on a multiplex with the B3306 to get to St Just, Cornwall.

Sunil_of_Yoxley · Post by **Sunil_of_Yoxley** » Thu May 08, 2008 11:24

sabristo simon wrote: A421 ends with a multiplex with the A428 to get to the A1

Unless i got this the wrong way round, wouldn't it make more sense for the A421 number to continue all the way to Cambridge?

A12 ends with a multiplex with the A102 to get to the A13, and a tiny bit further so that it ends in the middle of the junction.
The term for these is 'useless multiplex'

Theoretically the multiplex starts at Hackney Wick.

si404 · Post by **si404** » Thu May 08, 2008 12:59

Sunil_of_Yoxley wrote:Unless i got this the wrong way round, wouldn't it make more sense for the A421 number to continue all the way to Cambridge?

yes it would. But it doesn't.

Theoretically the multiplex starts at Hackney Wick.

indeed, and ends where there's no junction, halfway under the A13's bridge.

Jonathan B4027 · Post by **Jonathan B4027** » Thu May 08, 2008 13:03

How about the A418 at the Wheatley end then ? That multiplexes to end on the road it multiplexes with !!

skiddaw05 · Post by **skiddaw05** » Thu May 08, 2008 13:29

sabristo simon wrote: A140 ends with a multiplex with the A149 to get to Cromer

Puzzled of Norfolk writes: isn't it just the case that the A140 finishes a few miles to the south of Cromer, and the A149 from here is simply the A149 and not a multiplex at all, as the A140 doesn't continue beyond Cromer (unlike the A149 which does). I thought a useless multiplex was what would happen if this situation was reversed, ie if the A140 continued beyond the A149 to Cromer with the multiplex and the A140 itself finishing at the same place. But I may of got this wrong of course!

dvboy · Post by **dvboy** » Thu May 08, 2008 17:49

Jonathan B4027 wrote:How about the A418 at the Wheatley end then ? That multiplexes to end on the road it multiplexes with !!

The A418 doesn't multiplex, does it? It doesn't on Google Maps anyway.

B1040 · Post by **B1040** » Thu May 08, 2008 18:43

Puzzled of Norfolk writes: isn't it just the case that the A140 finishes a few miles to the south of Cromer, and the A149 from here is simply the A149 and not a multiplex at all, as the A140 doesn't continue beyond Cromer

I was going to say pretty much the same thing. I haven't had a chance to sit down with maps to check them all out, but if the other number is dominant and the multiplexed road never reappears then why is it a multiplex?
In conversation it's easy to call the A140 (say) the "Ipswich to Cromer" road. If we get pedantic and precise it's actually the "Junction near Needham Market on the A14 - Crossdale St (nearly in Cromer)" road

KevS · Post by **KevS** » Thu May 08, 2008 21:25

Quite correct all round - the A140 ends at the junction with the A149. The A149 is then primary from there to Cromer, at which point the primary road becomes the A148. Continuing into Cromer, the A140 number is not seen again, it's A149 all the way.

Dadge · Post by **Dadge** » Fri May 09, 2008 00:00

<pedant>duplex</pedant>

Jonathan B4027 · Post by **Jonathan B4027** » Fri May 09, 2008 08:31

dvboy wrote:The A418 doesn't multiplex, does it? It doesn't on Google Maps anyway.

It does, the signs on the ground are all A418, and the A40 is the non motorway traffic route. So unless there is a physical gap in the A40, its a multiplex.

The Hush · Post by **The Hush** » Fri May 09, 2008 08:50

M40 ends while multiplexng with the A34 and A41

M4 ends while multiplexing with A483

M5 ends while multiplexing with A38 and A30

Theres plenty of other M-way examples too.

si404 · Post by **si404** » Fri May 09, 2008 12:16

KevS wrote:Quite correct all round - the A140 ends at the junction with the A149. The A149 is then primary from there to Cromer, at which point the primary road becomes the A148. Continuing into Cromer, the A140 number is not seen again, it's A149 all the way.

The A140 to Cromer was a mapping error.

The Hush wrote:M40 ends while multiplexng with the A34 and A41

M4 ends while multiplexing with A483

M5 ends while multiplexing with A38 and A30

Theres plenty of other M-way examples too.

don't really count though...

SABRE

Roads that start/end on a multiplex

Roads that start/end on a multiplex

Re: Roads that start/end on a multiplex

Re: Roads that start/end on a multiplex