Flagstaff Road

Flagstaff Road is an arterial road in the southern suburbs of Adelaide in South Australia, Australia. It is one of the roads that carries commuter traffic between the city on the coastal plain and residential suburbs in the Adelaide Hills.

Flagstaff Road

South Australia
Flagstaff Road from Main South Road, showing gantry lights set for two lanes uphill (southbound)
Coordinates
General information
TypeRoad
LocationAdelaide
Length3.2 km (2.0 mi)[1]
Major junctions
North end Marion Road
Darlington, South Australia
  South Road
South endHappy Valley Drive
Flagstaff Hill, South Australia
Location(s)
RegionSouthern Adelaide[2]
Restrictions
GeneralCentre lane direction depends on time of day

Route

The northern end branches off of South Road at Darlington at a traffic light intersection with Marion Road opposite. Most of the road is in the suburb of Flagstaff Hill. The southern end is a roundabout where Blacks Road crosses, and Happy Valley Drive continues from Flagstaff Road in the suburb of Happy Valley. There are no major intersections along its length, only residential streets and local collectors.

The part of Flagstaff Road above the escarpment is a divided road with two lanes in each direction. Prior to widening, the steepest section was three lanes, with the middle lane reversible to match peak traffic flow. At the bottom, there are two lanes feeding into it from the traffic lights, and a total of five lanes feeding traffic towards Marion Road and South Road (northbound).

History

The section with three lanes was upgraded to this standard in the 1980s, to address increasing traffic due to expanding suburbs such as Flagstaff Hill and Aberfoyle Park. The overhead lane direction indicators were upgraded from green arrows to white ones using newer technology in 2013.[3] The 2019 South Australian state budget allocated A$32.9 million to widen the road and remove the reversible lane. Works started in early 2021, and were open to traffic in mid-2022.[4]

Intersections

Flagstaff Road is entirely contained within the City of Onkaparinga local government area.[5]

Location[1][6]km[1]miDestinationsNotes
Darlington0.00.0 Marion Road (A14 north) – Plympton, Brooklyn ParkNorthern terminus of road
Main South Road (A13) – St Marys, Reynella, Old Noarlunga
0.250.16begin three lanes
Flagstaff Hill1.00.62Begin dual carriageway
3.32.1Black Road – Flagstaff Hill
Happy Valley Drive – Happy ValleySouthern terminus of road
  •       Route transition

References
  1. Google (1 July 2022). "Flagstaff Road" (Map). Google Maps. Google. Retrieved 1 July 2022.
  2. "Location SA Map viewer with regional layers". Government of South Australia. Retrieved 16 June 2022.
  3. "Traffic Signal Uprgrade for Flagstaff Hill Road, Darlington". Department of Planning, Transport and Infrastructure. 15 May 2013. Retrieved 20 June 2019.
  4. "Flagstaff Road Upgrade". Department of Infrastructure and Transport. Retrieved 1 July 2022.
  5. "Location SA Map viewer with LGA layers". Government of South Australia. Retrieved 16 June 2022.
  6. "Location SA Map viewer with suburb layers". Government of South Australia. Retrieved 16 June 2022.
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