Southern Expressway, Adelaide
Southern Expressway | |
|---|---|
 | |
| Coordinates | |
| General information | |
| Type | Freeway |
| Length | 20.7 km (13 mi)[1] |
| Opened | 17 December 1997 (completed on 9 September 2001, north carriageway in August 2014) |
| Route number(s) |  M2 (1998–present) |
| Major junctions | |
| North end |  South RoadSt Marys, Adelaide |
 Marion Road | |
| South end |  Main South RoadOld Noarlunga, Adelaide |
| Location(s) | |
| Region | Southern Adelaide[2] |
| Major suburbs / towns | Tonsley, Darlington, Trott Park, Reynella, Noarlunga Downs |
| Highway system | |
Southern Expressway is an 18.5 km (11.5 mi) freeway[3] through the southern suburbs of Adelaide, South Australia. It is the southern part of the North–South Corridor which extends the full length of Adelaide and is being built to urban freeway standard. It is designated part of route M2.
The Southern Expressway was built as a corridor to relieve heavy traffic from the major arterial, Main South Road, in Adelaide's south. It was originally built as a reversible one way freeway, and was the world's longest after its completion in 2001. Between 2010 and 2014, it was expanded and it is now a regular 2-direction freeway.
Construction of the expressway also included the Adelaide Southern Veloway for cyclists, which runs alongside it for 7 km, from Marion/Main South Road to the Reynella Interchange. South of the Reynella Interchange, the bikeway becomes a shared track for the remaining 12 km of the expressway. The expressway crosses over the Coast to Vines Rail Trail at both Panalatinga Road and at the expressway's southern end.
Route
Southern Expressway starts in the central median of South Road in St Marys and continues southwest in a lowered trench between the carriageways of South Road, until it crosses Sturt River and continues in a south-westerly direction in its own alignment, running roughly parallel to Main South Road through Reynella to eventually terminate at an intersection with it just north of Old Noarlunga.
History
Pre-construction
The expressway is the southern part of a north–south freeway originally conceptualised under the Metropolitan Adelaide Transport Study (MATS), completed in 1965, as a freeway bypassing the city from Dry Creek to Old Noarlunga.[4] The MATS plan proved unpopular, and in 1971 all further highway construction in Adelaide was postponed for a period of ten years. In 1983 plans for the freeway north of Darlington were abandoned, and the land that had been set aside was progressively sold off.
In 1984 the state government announced plans to develop a "third arterial road" for the south. In 1987 the project was split into two phases, the first the upgrading of Main South Road and Marion Road in the Darlington area, and the second a new road from Darlington to Reynella. Phase one was completed in 1994 with the widening of Main South Road to eight lanes between Ayliffes Road and Seacombe Road, and the widening of Marion Road to six lanes between Main South Road and Sturt Road.
Phase 2 became the expressway, which was to be constructed in two stages: from Darlington to Reynella, and from Reynella to Old Noarlunga. It was developed as a one-way reversible road with future duplication provided for in the roadworks base, to be constructed when the need arose. It used the remaining "Noarlunga Freeway" reservation, except for the northernmost kilometre where a new route through O'Halloran Hill was chosen to provide high-quality links with Marion and Main South Roads without interfering with existing infrastructure at Sturt.
Construction of the reversible freeway
Construction of the expressway commenced in July 1995 and the first stage was opened to traffic on 17 December 1997. Construction commenced on the second stage in February 1999 and was opened to traffic on 9 September 2001. The total cost of the reversible freeway was A$76.5m.[citation needed]
Promotional FM radio transmitter
During its construction and for some time after its opening, the expressway was promoted via a dedicated FM radio station established by the Department of Transport broadcasting via a low-power FM transmitter in the immediate vicinity of the road.[5] The radio station broadcast a recorded message on continuous loop featuring promotional and community information messages relating to the expressway, including a jingle that Transport Minister Diana Laidlaw declared made the expressway the only road in the world to have its own jingle.[citation needed]
Operation as a one way road
Until August 2014, the expressway was open approximately 21 hours per day, one way for over 10 hours in each direction. The northbound (city-bound) direction occurred on weekday mornings (2:00 am – 12:30 pm) and weekend evenings (2:00 pm – 12:30 am), the southbound direction on weekday evenings (2:00 pm – 12:30 am) and weekend mornings (2:00 am – 12:30 pm).[6] It was closed 12:30–2:00 am and 12:30–2:00 pm, except for Saturday and Monday mornings when the direction remained unchanged. Weekday public holidays also operated under the weekend's opening times to accommodate tourists travelling to the Fleurieu Peninsula. During each closure all road signs, lights and boom gates changed over, and the road was inspected by a tow truck contractor for debris and car breakdowns.
Duplication
In 2007, the Howard Government pledged $100m towards widening the expressway in its unsuccessful re-election bid.[7]
On 17 February 2010, during the state election campaign, Premier Mike Rann announced that, if re-elected the expressway would be duplicated in a A$445m project.[8] However, the inclusion of a new A$75m interchange at Darlington was later scrapped, after the government planning for a major transport hub at Darlington discovered the need for a $50 million section of road that would have to be destroyed when the expressway was eventually duplicated.[9]
Once duplication was announced in 2010, construction started one year later in 2011. The first construction-related expressway closures were 3 consecutive days in January 2012, out of peak hours, but is the most disruption the road has experienced since the opening of Stage 2, with only day-long resurfacing of line-marking, and cycle rides disrupting the expressway previously.
Due to the duplication of the Expressway, all of the bridges had to be widened to meet the new width of the road.[citation needed] Some road bridges were closed during the work needed, and others required a temporary lower speed limit for safety reasons. This caused some anger to residents and businesses.[10]
The new road was built entirely on the western side of the original roadway, and is four lanes wide between Reynella and Marion Road in the northbound. Accessibility has been improved with the project, with completely new intersections at Beach Road and Sheriffs Road, as well as being able to left turn out at Old Noarlunga, right turn out at Marion Road, and left turn in at Marion Road.[11]
The expressway opened to two-way traffic in August 2014 and a cost of about A$400m.[12][13]
Darlington Upgrade
In 2014, the abandoned plans for an interchange at Darlington were revived and expanded to extend the Southern Expressway through Darlington.[14] The original project scope was to extend the expressway with a lowered motorway corridor passing underneath Flinders Drive (access to Flinders University and Flinders Medical Centre), Sturt Road and a bridge connecting local streets Mimosa Terrace and Sutton Road, to the intersection of South Road, Ayliffes Road and Shepherds Hill Road with surface-level service roads and segregated cycling and pedestrian paths; however, the project was later revised to continue the extension past Tonsley giving a total length of 3.3 kilometres. A road bridge, accessible from the Main South Road surface road and the lowered motorway, also allows northbound traffic free-flow access to Ayliffes Road. The associated Flinders Link Project extended the Tonsley railway line over this corridor to Flinders Medical Centre.[15]
Early works commenced late in 2014 and Gateway South, a joint venture of Fulton Hogan and Laing O'Rourke was awarded the major works contract for the project in January 2016. Major works commenced in 2016 for an expected project completion in 2018,[16] later revised to December 2019. Completion was further delayed to 2020 due to sections of the lowered motorway wall having collapsed.[17][18] Construction was completed and the lowered motorway fully opened to traffic on 1 August,[19][20] with the final road surfacing completed in late November through early December.
Exits and intersections
| LGA[21] | Location[1][22] | km[1] | mi | Destinations | Notes |
|---|---|---|---|---|---|
| Marion-Mitcham boundary | Tonsley-St Marys boundary | 0.0 | 0.0 | South Road (A2) – Edwardstown, Mile End, Hindmarsh | Northern terminus of expressway and route M2, route A2 continues north along South Road |
| Bedford Park-St Marys boundary | 1.0 | 0.62 | Ayliffes Road (east) – Pasadena, Goodwood Shepherds Hill Road (south) – Blackwood | No right turn northbound from Ayliffes Road westbound Northbound entry to and southbound exit from Shepherds Hill Road only | |
| Bedford Park | 2.1 | 1.3 | Main South Road (A13) – Darlington, Happy Valley | Original northern terminus, northbound entry and southbound exit only | |
| Marion | Sturt-Bedford Park boundary | 2.8 | 1.7 | Marion Road (A14) – Park Holme, Plympton, Brooklyn Park | Southbound entry and northbound exit only |
| Marion-Onkaparinga boundary | Trott Park-O'Halloran Hill boundary | 9.5 | 5.9 | Main South Road (A13 northeast, southwest) – Reynella Panalatinga Road (south) – Onkaparinga Hills | Northbound entry and southbound exit only |
| Onkaparinga | Reynella-Lonsdale-Morphett Vale tripoint | 14.0 | 8.7 | Sheriffs Road – Lonsdale, Woodcroft | |
| Morphett Vale-Christie Downs-Noarlunga Centre-Hackham West quadripoint | 17.6 | 10.9 | Beach Road – Noarlunga Centre, Christie Downs | ||
| Huntfield Heights-Noarlunga Downs-Hackham tripoint | 20.7 | 12.9 | Main South Road (A13) – Cape Jervis, Victor Harbor | Southern terminus of expressway and route M2 | |
| |||||
See also
References
- ^ a b c Google (29 June 2022). "Southern Expressway" (Map). Google Maps. Google. Retrieved 29 June 2022.
- ^ "Location SA Map viewer with regional layers". Government of South Australia. Retrieved 16 June 2022.
- ^ A guide to using the Southern Expressway, Department of Planning, Transport and Infrastructure, Government of South Australia
- ^ MATS plan freeways, ozroads.com.au
- ^ The Hon. Sandra Kanck MLC. "Hansard 17 October 1995". Hansard of the Legislative Council of South Australia. Retrieved 29 December 2008. [dead link]
- ^ "Southern Expressway". Government of South Australia. Archived from the original on 3 May 2013. Retrieved 3 November 2013.
- ^ PM's $100m pledge, Mark Kenny, The Advertiser, 18 August 2007.
- ^ http://www.adelaidenow.com.au/news/in-depth/southern-expressway-to-be-doubled-announces-sa-premier-mike-rann/story-fn2sdwup-1225831294904 [bare URL]
- ^ "New Southern Expressway freeway Darlington interchange scrapped". AdelaideNow. 22 August 2011. Retrieved 22 August 2011.
- ^ Southern Expressway upgrade affects trade for Morphett Vale businesses, The Australian, 21 May 2013
- ^ "Project overview - Department of Planning, Transport and Infrastructure (DPTI)". Archived from the original on 30 April 2014. Retrieved 8 August 2014.
- ^ "Southern Expressway Duplication - Department for Infrastructure and Transport - South Australia".
- ^ "Southern Expressway flows in two ways". The Times. Fairfax Regional Media. 5 August 2014. Retrieved 5 August 2014.
- ^ "Darlington Upgrade Project". Department of Planning, Transport and Infrastructure. 5 September 2014. Retrieved 19 December 2014.
- ^ "Darlington Upgrade Project". Department of Planning, Transport and Infrastructure. Retrieved 3 September 2018.
- ^ "What's next". Department of Planning, Transport and Infrastructure. 3 December 2014. Retrieved 19 December 2014.
- ^ "SA taxpayers will not have to 'foot the bill for shoddy work' on $620m Darlington Upgrade". ABC News. Australian broadcasting Corporation. 8 May 2019. Retrieved 23 July 2019.
- ^ "Darlington Road upgrade set to finish in 2020". 9News. Nine Entertainment Co. 20 June 2019. Retrieved 23 July 2019.
- ^ Smith, Matt (31 July 2020). "Darlington Upgrade Project officially opens on Saturday with full speed in all lanes". The Advertiser. Adelaide. Retrieved 28 September 2020.
- ^ Tudge, Alan (1 August 2020). "Darlington upgrade project fully open to traffic" (Press release). Adelaide. Archived from the original on 28 September 2020. Retrieved 28 September 2020.
- ^ "Location SA Map viewer with LGA layers". Government of South Australia. Retrieved 16 June 2022.
- ^ "Location SA Map viewer with suburb layers". Government of South Australia. Retrieved 16 June 2022.
External links
- Southern Expressway Traffic Management System Transport SA
