A couple of things of interest from the last few days in the Tonsley area:
1. As of Saturday night, northbound traffic is now using the full length of the North-South Motorway from the Southern Expressway right through to the bottleneck outside the pub at Tonsley, albeit on a temporary route in the trench which weaves about to avoid ongoing work sites rather than the final route.
2. There was no passenger service on the Tonsley rail line yesterday, due to a track maintenance vehicle breaking down early in the morning and being shoved out of the way onto the Tonsley line to clear the way for the day's Seaford services. The platform at Clovelly Park is only 112m long so there wasn't room to put the broken maintenance vehicle right to the end of the line and have the EMUs stop at the northern end of the platform.
Apparently the announcement regarding the alignment/construction method of the Darlington-Torrens section of South Road is immanent. I was arguing with a friend the other day about the various methods they could use, advantages/disadvantages.
Presumably any of those options have lots of land acquisition involved by especially the trench option.
- Cut and cover, entirely possible and probably cheapest option but unlikely because they'll have to close sections of South Road at a time and that's political poisonous.
- Bored tunnel; most expensive option by far and for some reason the most likely; also would take the longest at a projected finish date of 2026. I'm not sure if given the cost that they'll be able to resist the urge to toll?
- Elevated motorway (like the South Road 'superway'), again a cheaper option than a bored tunnel and because much of the area from Cross Road to Darlington is already industrial/retail I'd imagine there may not be a lot of local objection to an overhead road.
- Widening the road and trenching the motorway as was done with Torrens to Torrens. Not sure where this comes in ranking in terms of cost (perhaps one of our resident engineers might be able to comment?) but it would be a faster option than bored tunnel.
I'm sure there will be an announcement of a preferred option before 2020 is done, but I'd be very surprised if anything is set in stone before we get a new Premier either at the 2022 election or sooner if the Libs get sick of putting Marshall's photo on milk cartons.
I would favour an elevated tollway (i.e. a repeat of the 'Superway') for the Tonsley-Anzac section. The properties on each side go back far enough that you could get more than enough width just by acquiring properties along one side of South Road.
I'd probably consider the best option as being to widen the western side from Tonsley to Daws Road, and then have a gentle right-left s-bend to switch over to the eastern side north of Daws Road. Put the railway underground at Cross Road (relocate Clarence Park station to the south-east as compensation for the closure of Emerson) then have the tollway come back to surface level at Glandore to pass under a rebuilt tram overpass (accomodating both the tollway and South Road) before the tollway would feed into the Gallipoli Underpass and Anzac Highway turn lanes.
The rebuilt surface road should have two lanes in each direction, a bike lane in each direction, and indented bays for bus stops and 1 hour parking. Right turns should be abolished other than at major intersections, with the alternative being u-turn lanes in the space under the elevated tollway.
I notice the car dealership just south of the Cross Road overpass is in the process of being demolished. What will become of the site?
Left vacant until some decision is made on the road or rebuilt to be compusorily acquired in a couple of years time?
Obstructing the routine renewal of commercial properties without having an actual plan for what is going to happen is only a recipe for making the area look derelict, lowering the tone for the surviving businesses even before they get slammed with five years of road building.
It's not like the T2T project where there was an existing property acquisition mechanism for part of it.
The eastern side of the road would be the better side to acquire in the section through Edwardstown as there are fewer very large properties, so Australian Motors shouldn't need to be acquired.