Southern Connector (SOCR) - SE Freeway to the Airport

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fifty
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Southern Connector (SOCR) - SE Freeway to the Airport

#1 Post by fifty » Thu Dec 31, 2015 1:03 am

Hi All

Had this in my mind for a while, and with some discussion of this issue on the South Rd thread, I thought I may as well sketch my ideas up and start a new Visions thread, so here you go...

With the recent additions to T2T and Darlington, a final, completed, uninterupted NS Motorway is finally becoming a reality. Much of the justification for this, at least for federal funding, relates to freight. As an eastern suburbs resident, I can say that pretty much all eastern states bound and sourced freight currently charges up and down Portrush Rd. Once more sections of the NS Motorway are complete, I am sure we will see this change to Cross Rd, as trucks aim to get on it and access the northern industrial areas quicker. It begs the question. how does DPTI see the SE Freeway and NS Motorway eventually linking up, if ever?

My personal thoughts are that the best option for this would NOT be Cross Rd. This is due to the mega land values and NIMBYness down this strip which would drag it out forever and blow a hole the size of the State Bank 1980's style in the Govt's coffers. The significant area needed for an interchange with the upgraded NS Motorway, which would be at Emerton train intersection, only further complicates and costs this solution. On the flipside, the benefits of the Cross Rd option are that it is the shortest route, and there are convenient options for truck arrester beds in adjacent Waite Arboretum and Urrbrae wetlands.

I believe a better option would be a route using Glen Osmond Rd, a tunnel under Glenside, Greenhill Rd, and Richmond Rd. I call it the Southern Connector (SOCR). Low-rez plain jpg here
Image
...or much better hi-rez Google Maps version here (https://www.google.com/maps/d/edit?mid= ... vpacJcOfO0) where you can zoom in and click on each section or interchange to see detailed designs and annotated notes.

Clear benefits I see with the SOCR include:
- Land acquisition costs will be lowest, being mainly a strip along the upper section of Glen Osmond Rd, and some low value semi-industrial areas in Richmond and along Richmond Rd.
- It serves as more than just a link between SE Freeway and NS Motorway, but also as a key connector of traffic with the city and the airport, adding a very significant additional benefit to the economic analysis. This is not just for itself, but also for the entire linked system with a completed NS Motorway, and the city ring route, by leveraging additional use of those already completed assets (assuming it has been fully built by then).
- It is more likely to attract a greater proportion of federal funding, via the obvious freight and commercial benefits of linking in with the airport.
- Other than reducing the carnage that is Portrush Rd, it will also reduce load on the lower half of Glen Osmond Rd, enabling the community aspects of its development that the Council is seeking to proceed at Frewville/Glenside shops, Arkaba, the factory direct zone near Parkside Primary, coffee shops, etc..
- The low value semi-industrial triangle between Richmond Rd, South Rd and James Congdon Dr provides a convenient, relatively affordable and I think appropriately sized block of land for a chunky at-grade interchange that befits the connection of what would surely become Adelaide's two most utilized roads. Emerson certainly can't handle something like this. The closeness of Richmond and Anzac Hwy connections could be an issue, although looking at the new Darlington plans, and the closeness of the connections there, I no longer regard this as an issue with SOCR.

The downsides include no obvious arrestor bed zones, some tricky engineering at some of the interchanges (eg. Glenside with the creek, and Keswick with the railway). There will also be a parklands backlash via a small expansion of the width of the current Greenhill Rd corridor (I'm sure the gov't can find some land elsewhere to enable no net change).

What do you think? All reactions appreciated. Hoping SA can do something like this, or better somewhere else, to fill the missing link between our two marque road assets.

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Re: Southern Connector (SOCR) - SE Freeway to the Airport

#2 Post by claybro » Thu Dec 31, 2015 1:38 am

Hey fifty. I do like the plan as it resolves the current problem of Glen Osmond bottleneck for hills residents. It also connects the SE freeway to a more central point in the N/S motorway. It links to the airport. It gets trucks off of Portrush road. What it does not do is encourage the development of a middle ring route, because cross road would not be upgraded. The other downside would be that it would encourage commuter traffic into the city from the hills due to the proximity to the CBD. Perhaps a price discouragement by tolling would be appropriate for private vehicles. The length of tunnelling is not too horrendous. The parklands preservation society will have a melt down with the Greenhill Riad section though!

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Re: Southern Connector (SOCR) - SE Freeway to the Airport

#3 Post by ChillyPhilly » Thu Dec 31, 2015 3:30 am

I like it. Greenhill Road would prove to be the ultimate challenge though. How would issues of connectivity between the suburbs south of the CBD with the Parklands, be addressed?
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Re: Southern Connector (SOCR) - SE Freeway to the Airport

#4 Post by fifty » Thu Dec 31, 2015 8:59 am

claybro wrote:Hey fifty. I do like the plan as it resolves the current problem of Glen Osmond bottleneck for hills residents. It also connects the SE freeway to a more central point in the N/S motorway. It links to the airport. It gets trucks off of Portrush road. What it does not do is encourage the development of a middle ring route, because cross road would not be upgraded. The other downside would be that it would encourage commuter traffic into the city from the hills due to the proximity to the CBD. Perhaps a price discouragement by tolling would be appropriate for private vehicles. The length of tunnelling is not too horrendous. The parklands preservation society will have a melt down with the Greenhill Riad section though!
Yeah the use of parklands will be an issue. Everyone has their own opinion I guess. I am in the camp that there is plenty of barely used land elsewhere to justify use of land here, but others will disagree. You can't have a development like this without confronting opposition somewhere. I guess it will be Glen Osmond rd business and Portrush and Cross rd residents for SOCR in the one camp and parklands preservation society and upper Glen Osmond rd residents against it in the other.

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Re: Southern Connector (SOCR) - SE Freeway to the Airport

#5 Post by fifty » Thu Dec 31, 2015 9:17 am

ChillyPhilly wrote:I like it. Greenhill Road would prove to be the ultimate challenge though. How would issues of connectivity between the suburbs south of the CBD with the Parklands, be addressed?
Well, I'm not sure unmanaged pedestrian access along all of Greenhill rd can continue much longer anyway from a safety aspect. In my SOCR proposal all road crossings of Greenhill rd into the city including pedestrian crossings would remain and in fact be improved with lower vehicle volume on surface Greenhill rd. I guess you would also build a number of dedicated pedestrian/bike bridges where those types of crossings feature now, eg. Showgrounds, Clark St, Porter St, Beaumont rd.



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Last edited by fifty on Thu Dec 31, 2015 9:44 am, edited 2 times in total.

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Re: Southern Connector (SOCR) - SE Freeway to the Airport

#6 Post by fifty » Thu Dec 31, 2015 9:30 am

Thinking about Greenhill Rd a bit more, one way to minimize the encroachment in to Parklands would be rather than split the surface Greenhill Rd either side of a trench (ie, two median strips), keep the surface Greenhill Rd on one side and the trench on the other. Greenhill rd surface would reduce to two lanes either direction anyway, so with a bit of the current median strip, both directions could fit on the southern side (current west bound) allowing full and unrestricted access to the businesses along here from both directions (better than now). The northern side (current east bound) road and median strip would then be the trench. There would still be some Parklands needed, but less so.

This alignment would also bring the bonuses of i) keeping the current median strips trees, ii) simplifying the land intersections (essentially what they are now), and iii) allowing simpler at-grade entries and exits from the trench at Peacock Rd (while I'm at it I would change this to stretch of King William Street through the parklands to King WIlliam St!) and Fullarton Rd.

I will add these and other details to my Google Maps sketch up over time.

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