M6 Motorway and A6 conflict (Sydney)

[MH2351]

So afaik, road numbers do not have duplicates regardless of what road standard they are on. 

For example, u don't see the old Princes Highway as A1 while the Princes Motorway becomes the M1. Sometimes may have an additional number to prevent duplicates from arising such as the Princes Highway as the A10 instead of A1 as that is taken by the M1 Princes Freeway.

My concern is that, will this logic no longer in effect once the M6 from M8 to A1 President Avenue. There is already the A6 route from the Princes Junction further south to the A28 Cumberland up north. Or is this a sign that they are meant to link up together extending the current A6 to M8 through a southern arc? The plans for further extending M6 also seems to be off resulting in a missing puzzle piece between A6 and M6. Or is that the role for the existing A1 Princes.

[Daniel Knott]

My guess is that M6 is just the project name, and they still could call it anything - similar to how the New M5 became the M8. M6 is just a hangover from the old F6 name.

It does raise an interesting question about what it actually should be. Can't be M1, unless M1 was to be redirected through Westconnex and the WHT. Shouldn't be M6 either. Wouldn't surprise me if it is un-numbered, or just To M1/To M8.

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[AlienChex]

I made this quick map a couple years ago based on my theory. Basically M6 is a placeholder since F6 was the designated number that the old southern freeway and the “Southconnex” corridor. In my vision:

M1 follows the new Southconnex from Waterfall to President Ave, then follows it’s existing route past the airport and through the city

M8 ‘starts’ at both the President Ave and King Georges Road intersections and follows the new tunnel and western harbour tunnel, planned to continue through beaches link to the northern beaches to meet A8. (though that last part is on hiatus)

A8 from Burnt Creek Dev to North Sydney becomes routeless (or A18?)

M4 follows the tunnel through to Anzac Bridge and into the city as A4 like normal. The whole A44 routing has been half-assed at best so I have no idea what they’re planning there

I hope they don’t actually number it M6. We’re not Queensland with the duplicate routes it’ll just be extra confusing as people may think it’s a shortcut to A6 (it’s not)

[#130km/hforthehume]

A slight update with that map, though: Labor has since cancelled the Beaches Link project. Doesn't affect anything regarding the route numbering, though.

My prediction is that M6 will likely get an entirely new route number as there won't be any connection to A6 (thankfully stage 4 was cancelled), but only time will tell. The other possibility is the section between M8 and M5 becoming unnumbered, but that will only cause a lot of confusion among the public.

[Jason Kumar]

A44 starts from the Victoria road intersection with the city west link and continues down wattle St to Parramatta road and then through to Parramatta. The new sign on the Anzac bridge westbound on the new gantry has A44 on it (though has been covered up again)

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[AlienChex]

Yeah thats unfortunate, but luckily the M8 can continue on as A8 at that Falcon St intersection (hopefully it’s seamlessly designed)

My idea wasn’t that the M5 section becomes unnumbered, it was that both sections (M8 to M5, M8 to M1) are M8 to the average person, signposted on one end as “M8” and the other end as “to M5” and “to M1”

[Henry Ung]

The M5 - M8 link and the M4 - M8 links are just giant on and off ramps. They should be signed differently depending on the direction of travel.

I wonder if the Victoria Road link will take up the A40 route when opened.

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[AlienChex]

If you’re driving from the M5 eastbound or the M1 northbound, the sign will say “M8 Parramatta Chatswood”

If you’re driving from the M8 southbound, the road will split and the sign will say “TO M1 Wollongong” and “TO M5 Liverpool Canberra”. The M8 number won’t show for southbound traffic as the route essentially “ends” here. All that matters is that drivers know this road will lead to M8 or the M5/M1 depending on their direction of travel. It would be too confusing to add an entirely new number.

[#130km/hforthehume]

I don't know if that would cause confusion with tolling, though. 

[Tom]

Resurrecting an old topic: Recently several signs on Silverwater Road have been replaced, with new borderless A6 signs on coverplates, which are covering - we don't know. The coverplates are almost exactly the same size as the A6 lettering, making two digit routes impossible (with one exception). This leads to two possible options:

• A1 - while it would be surprising to reroute A1 onto the A6 corridor, that would at least justify the use of M6 on what is currently part of the A1 corridor. The newly named M11 would need to be changed to M1, and the existing M1 would all become M6, I guess? 
• A11 - providing a continuous "A1 bypass" linking to M11/Northconnex. 

Either option would presumably require a duplex with A28 through Carlingford to make any sense.  

Any thoughts on which of these theories is more probable, or are there any other possibilities?

[Sam L]

A11 is much more likely than A1, imo.

For me, probably the leading candidate at the moment is "manufacturing error." All the new signs were made by the same manufacturer in November 2024, so it's quite possible that they were all made with the same error which needed correction before installation. If we see further new signs going up this year with the A6 on a coverplate then I would have to reconsider this theory.

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From: aussie-...@googlegroups.com <aussie-...@googlegroups.com> on behalf of Tom <tomhol...@hotmail.com>
Sent: Monday, 24 February 2025 9:49 AM
To: Aussie Highways <aussie-...@googlegroups.com>
Subject: Re: [Aussie Highways] M6 Motorway and A6 conflict (Sydney)

 

[Tom]

Today I saw one or two new signs north of the river with the same coverplate treatment. Not sure when the signs were manufactured but they were definitely installed a few months after the ones close to the M4.

I do agree A11 seems the more likely candidate, but that does leave the unanswered question of why part of the M1 is apparently going to be the M6.

[Sam L]

From memory there's about half a dozen of these coverplated A6 signs between Kissing Point Rd and Parramatta Rd, all manufactured by G&B in November 2024. I haven't seen any others along the rest of the route.

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From: aussie-...@googlegroups.com <aussie-...@googlegroups.com> on behalf of Tom <tomhol...@hotmail.com>

Sent: Monday, 24 February 2025 12:02 PM

To: Aussie Highways <aussie-...@googlegroups.com>
Subject: Re: [Aussie Highways] M6 Motorway and A6 conflict (Sydney)

[Albert Alcoceba]

On 24 Feb 2025, at 3:02 pm, Tom <tomhol...@hotmail.com> wrote:

Today I saw one or two new signs north of the river with the same coverplate treatment. Not sure when the signs were manufactured but they were definitely installed a few months after the ones close to the M4.

I do agree A11 seems the more likely candidate, but that does leave the unanswered question of why part of the M1 is apparently going to be the M6.

My theory is that it won’t be signed as M6 when it opens regardless of what it’s being called during construction.

[AlienChex]

The "M6" is just a rebranding of what was going to be Southconnex. When opened, I assume the part south of President Ave will be M1, the part north will just point "To M8", and the Princes Hwy will extend A36 south to wherever the new tunnel comes out.

The current A6 should remain A6