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crawf wrote:The Port & Grange Rd tunnel should be made longer than 1km.

Whether this gets built next or not, I don't know - if the Sturt Road underpass is cheaper, as I suspect it will be, they may build that first due to the economic circumstances of the times. However, it would not surprise me if there is no tunnel as such under Grange Road, Port Road, and the train line, but rather a series of underpasses, South Road remaining at the lower level from one end of the series to the other, but not completely covered over to form a tunnel. Grange Road, Port Road and the rail line would cross on bridge decks, similar to the Bakewell Underpass.

What would be the advantage of a cut-and-cover tunnel? Maybe the top of it could be used instead of slip lanes to access the roads crossing over?

rhino wrote:

crawf wrote:The Port & Grange Rd tunnel should be made longer than 1km.

Whether this gets built next or not, I don't know - if the Sturt Road underpass is cheaper, as I suspect it will be, they may build that first due to the economic circumstances of the times. However, it would not surprise me if there is no tunnel as such under Grange Road, Port Road, and the train line, but rather a series of underpasses, South Road remaining at the lower level from one end of the series to the other, but not completely covered over to form a tunnel. Grange Road, Port Road and the rail line would cross on bridge decks, similar to the Bakewell Underpass.

What would be the advantage of a cut-and-cover tunnel? Maybe the top of it could be used instead of slip lanes to access the roads crossing over?

i would've thought the Sturt Road underpass would be of a higher priority as at least that will assist Southern suburbs traffic getting to the CBD quicker....... as all the underpasses are pointless until there is a long stretch of unimpeded driving, as otherwise the bottlenecks will just be moved further up the road.

i assume this could all be calculated quite easily using some kind of graphical software that simulates traffic flows after a change to an intersection is made. with the amount of money these types of road projects cost, the least they could do would be to invest in that type of technology at the very least to enable prioritization of these projects.

the other one, which no one has talked about is the Daws Road intersection, one to watch as South Road use increases after each project.

ricecrackers wrote:assist Southern suburbs traffic getting to the CBD quicker

Take a bloody train.

AtD wrote:

ricecrackers wrote:assist Southern suburbs traffic getting to the CBD quicker

Take a bloody train.

i dont even live there, but there is commercial traffic to consider

and this...

http://www.news.com.au/adelaidenow/stor ... 82,00.html

crawf wrote:The Port & Grange Rd tunnel should be made longer than 1km.

rhino wrote:Whether this gets built next or not, I don't know - if the Sturt Road underpass is cheaper, as I suspect it will be, they may build that first due to the economic circumstances of the times. However, it would not surprise me if there is no tunnel as such under Grange Road, Port Road, and the train line, but rather a series of underpasses, South Road remaining at the lower level from one end of the series to the other, but not completely covered over to form a tunnel. Grange Road, Port Road and the rail line would cross on bridge decks, similar to the Bakewell Underpass.

What would be the advantage of a cut-and-cover tunnel? Maybe the top of it could be used instead of slip lanes to access the roads crossing over?

More to the point, was a tunnel ever part of the official proposal?

ricecrackers wrote: i would've thought the Sturt Road underpass would be of a higher priority as at least that will assist Southern suburbs traffic getting to the CBD quicker....... as all the underpasses are pointless until there is a long stretch of unimpeded driving, as otherwise the bottlenecks will just be moved further up the road.

That's actually not true, because the new bottlenecks won't be as narrow as the old ones. The benefits would be limited, but that doesn't make them pointless.

i assume this could all be calculated quite easily using some kind of graphical software that simulates traffic flows after a change to an intersection is made. with the amount of money these types of road projects cost, the least they could do would be to invest in that type of technology at the very least to enable prioritization of these projects.

They already do.

the other one, which no one has talked about is the Daws Road intersection, one to watch as South Road use increases after each project.

Good point, but I don't think Daws Road carries all that much traffic - though maybe that will change after it's aligned with Springbank Road.

AtD wrote:

ricecrackers wrote:assist Southern suburbs traffic getting to the CBD quicker

Take a bloody train.

Unfortunately the trains serve too small a part of the Southern suburbs, and don't serve the CBD very well either. For many commuters it's quicker to catch a bus, and most of the buses go via South Road.

Aidan wrote:

the other one, which no one has talked about is the Daws Road intersection, one to watch as South Road use increases after each project.

Good point, but I don't think Daws Road carries all that much traffic - though maybe that will change after it's aligned with Springbank Road.

The South/Daws intersection is a nightmare! The delays are almost as bad as South/Sturt intersection.

And what the...? are there really plans to align Daws Rd with Springbank Rd?

Wayno wrote:

Aidan wrote:

the other one, which no one has talked about is the Daws Road intersection, one to watch as South Road use increases after each project.

Good point, but I don't think Daws Road carries all that much traffic - though maybe that will change after it's aligned with Springbank Road.

The South/Daws intersection is a nightmare! The delays are almost as bad as South/Sturt intersection.

Can someone else confirm this? I thought the lights were set so that only the Daws Road traffic got the long delays.

And what the...? are there really plans to align Daws Rd with Springbank Rd?

I admit I haven't seen any, but I think so - it's the most obvious realignment still to do, with the possible exception of Holbrooks and Marion Roads.

Aidan wrote:

Wayno wrote:

Aidan wrote:Good point, but I don't think Daws Road carries all that much traffic - though maybe that will change after it's aligned with Springbank Road.

The South/Daws intersection is a nightmare! The delays are almost as bad as South/Sturt intersection.

Can someone else confirm this? I thought the lights were set so that only the Daws Road traffic got the long delays.

Yes, the traffic on Daws Road itself gets quite clogged up, especially in peak hours. TSA reports that about 25 000 cars travel along Daws Road on either side of the intersection.

Aidan wrote:

rhino wrote:Whether this gets built next or not, I don't know - if the Sturt Road underpass is cheaper, as I suspect it will be, they may build that first due to the economic circumstances of the times. However, it would not surprise me if there is no tunnel as such under Grange Road, Port Road, and the train line, but rather a series of underpasses, South Road remaining at the lower level from one end of the series to the other, but not completely covered over to form a tunnel. Grange Road, Port Road and the rail line would cross on bridge decks, similar to the Bakewell Underpass.

What would be the advantage of a cut-and-cover tunnel? Maybe the top of it could be used instead of slip lanes to access the roads crossing over?

More to the point, was a tunnel ever part of the official proposal?

http://www.dtei.sa.gov.au/infrastructur ... /port_road

"The state government's proposal is for South Road to be reconstructed so that traffic on South Road will continue uninterrupted past the Grange Road and Manton Street intersection, the Port Road intersection and the Outer Harbor Rail corridor. "

That site has been modified several times in the last couple of years. Originally, it said that a 600m tunnel would be constructed to carry traffic underneath Grange Rd, Port Rd and the Outer Harbour railway line (I think that was back when all of the transport project information was on the transport.sa.gov.au site - it's now all been moved to DTEI). Then it was modified to say that a series of underpasses would be constructed (instead of a tunnel). Now it says that a planning study is ongoing to determine the "best solution". Funny enough, it has said the planning study will continue "over the next two years" for about 12-18 months now.

As I recall, no timing was given for construction when the announcement was first made. After construction began on the Anzac Highway underpass, and the costs blew out, the Grange/Port Rd section was updated to say that construction was not expected to begin until 2010. I've noticed that, within the last month or two, this statement has been removed entirely.

It makes one wonder if it will ever happen. Furthermore, the Sturt Rd intersection doesn't even get a mention.

The Grange Road, Port Road and Outer Harbor Rail Line and widening of South Road between Port Road and Torrens Road project will probably finish up being grade seperation for the Outer Harbour railway line only, sufficient widening of south road itself to include slightly wider lanes, a centre median where that does not allready exist and probably won't be done until 2017.

It has been delayed for 2 years is the last I heard.

Its a really messy project due to the need to relocate not just 3 sets of 66kv power lines, but also rebuild the substation they feed. Only once all that is done can they start on the road itself. The substation is on the northern most corner of South and Port Roads

The claims of several underpasses is rubbish, Port Road and the rail line are close enough together that it would be easier and cheaper to make it one big underpass. And Grange road isn't that much further away either.

fabricator wrote:The claims of several underpasses is rubbish, Port Road and the rail line are close enough together that it would be easier and cheaper to make it one big underpass. And Grange road isn't that much further away either.

They're further apart than the road and the railway bridgedecks at the Bakewell Underpass. I suspect the road will be sunk, and several (at least 4) bridge decks will cross it, as opposed to a tunnel.

fabricator wrote:The claims of several underpasses is rubbish

From the DTEI website:
http://www.dtei.sa.gov.au/infrastructur ... /port_road

The planning study is continuing to define the road alignment to accommodate the underpasses at the intersections of South and Grange roads and South and Port roads, the railway line and widening of South Road.

It will probably be one giant underpass

Update on the Anzac Highway Underpass, overhead signage has now starting to be put in place.