Southern Expressway (South Australia)

Southern Expressway South Australia
Main South Road at the northern end of the expressway (looking south), closed to south-bound traffic
General information
Type	Freeway
Length	21 km (13 mi)
Opened	17 December 1997
Maintained by	Department of Planning, Transport and Infrastructure
Route number(s)	M2 (Entire length)
Major junctions
North end	Main South Road (A13) Darlington, Adelaide
	Marion Road (A14)
South end	Main South Road (A13) Old Noarlunga, Adelaide
Location(s)
Major suburbs / towns	Bedford Park, Darlington, O'Halloran Hill, Trott Park, Reynella, Morphett Vale, Noarlunga Downs, Seaford
Highway system
Highways in Australia National Highway • Freeways in Australia Highways in South Australia

File:Southern veloway2.jpg

The Adelaide Southern Veloway

The Southern Expressway is a freeway in South Australia. It was previously the world's longest reversible one way freeway, although it has since been turned into a regular 2-direction freeway. Originally proposed as 'Noarlunga Freeway', it was built as a corridor to relieve heavy traffic from the major arterial, Main South Road, in Adelaide's south. The expressway was built in two stages — the first completed in late 1997, the second in 2001. The total cost of the arterial was A$76.5m, and it is 21 kilometres (13 mi) in total length. Main South Road provides both the start and finish. There are exits at Marion Road, Panalatinga Road, Sherriffs Road and Beach Road. The Southern Expressway is signed as M2.

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 Panalatinga Tunnel. South of the Panalatinga Tunnel, 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. The expressway opened to two-way traffic in 2014 after a construction period of about a whole year and a cost of about A$400m.

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. 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 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.

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. 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.

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). 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.

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. 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.

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. 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.

The expressway opened to two-way traffic on 3 August 2014. 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. Being open 24 hours a day, in both directions, removed much of the previous confusion caused locals and visitors as to when, and which direction the expressway ran. 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.

Exits and intersections

Southern Expressway
Southbound exits	Distance from Bedford Park (km)	Northbound exits
Start Southern Expressway 30px continues from Main South Road	0 km	End Southern Expressway 30px Merges with Main South Road to & City
no exit		City via Main South Rd South Road
no exit	0.5 km	City via Marion Rd Marion Road
Reynella, Woodcroft Panalatinga Road South Road	5.6 km	no exit
Lonsdale Sheriffs Road	9.9 km	Lonsdale Sheriffs Road
Noarlunga Centre, Christie Downs Beach Road	14.3 km	Noarlunga Centre, Christie Downs Beach Road
Old Noarlunga, Victor Harbor Main South Road	21.0 km	no exit
End Southern Expressway 30px Merges with Main South Road to & 30px		Start Southern Expressway 30px continues from Main South Road

Map

Southern Expressway National Route M1

Legend Main South Road Main South Road Bedford Park Interchange Marion Road Marion Road Darlington Interchange Seacombe Road Seacombe Road Majors Road Majors Road Lander Road Lander Road Main South Road Reynella Interchange x20px Panalatinga Road Main South Road Young Street Young Street Moore Road Moore Road Brodie Road Sherriffs Road Sherriffs Road Lonsdale Interchange Brodie Road O'Sullivan Beach Road O'Sullivan Beach Road Flaxmill Road Flaxmill Road Elizabeth Road Elizabeth Road Noarlunga Interchange Beach Road Beach Road Honeypot Road Honeypot Road Old Noarlunga Interchange Main South Road Main South Road

Bridges

File:Southern expressway bridge over field river.jpg

Southern Expressway over the Field River in Reynella

The 15 bridges over the expressway from north to south are:

No.	Name	Suburb	Type
1	Seacombe Road	Darlington	Vehicle
2	Majors Road	O'Halloran Hill	Vehicle
3	Glenthorne Path	O'Halloran Hill	Foot
4	Young Street	Reynella	Vehicle
5	Moore Road	Reynella	Vehicle
6	Sugarbush Path	Reynella	Foot
7	O'Sullivan Beach Road	Morphett Vale	Vehicle
8	Glenhelen Path	Morphett Vale	Foot
9	Flaxmill Road	Morphett Vale	Vehicle
10	Elizabeth Road	Morphett Vale	Vehicle
11	Beach Road	Morphett Vale	Vehicle
12	Poznan Path	Hackham	Foot
13	Honeypot Road	Hackham	Vehicle
14	Peppermint Path	Hackham	Foot
15	Perry Path	Hackham	Foot

The expressway has five underpasses:

No.	Location	Suburb	Type
1	Marion Road	Sturt	Vehicle
2	O'Halloran Hill Recreation Park	O'Halloran Hill	Foot
3	Lander Road	Trott Park	Vehicle
4	Sherriffs Road	Reynella	Vehicle
5	Southern Expressway Southern terminus	Huntfield Heights	Bicycle

See also

• Freeways in Australia
• Freeways in South Australia

References

• Adelaide's Freeways - A History from MATS to the Port River Expressway

External links

• Southern Expressway Traffic Management System Transport SA