Road Photos & Information: Western Australia
South Western Highway
Armadale to Pinjarra
Statistics:
- Length:
- 154 km (Armadale to Pinjarra: 58 km)
- Termini:
- Northern: Armadale Rd (SR14) and Albany Hwy (SR30), Armadale
- Southern: Robertson Dr (NR1 / SR10) and Picton Rd (unnumbered), Glen Iris
- Miscellaneous:
- Continues as NR1 from Bunbury
- Suburbs, Towns & Localities Along Route:
- Armadale, Mount Richon, Wungong, Darling Downs, Byford, Cardup, Whitby, Mundijong, Jarrahdale, Mardella, Serpentine, Keysbrook, North Dandalup, Fairbridge and Pinjarra
Route Numbering:
- Current: 20
- Multiplexed with: 22 206
- Former: 1
- Road Authority Internal Classification: 1
- H009
General Information:
State Route 20 is a north-south route connecting the southwestern suburbs of Perth with Western Australia's third largest city, Bunbury.
Once the primary thoroughfare connecting Perth to the southwest, this route links a multitude of small towns that owe their existence to the 19th-century construction of the railway line that closely parallels much of State Route 20's length.
The route is rural highway standard for most of it, and services residential, commercial, light industrial and agricultural areas.
- State Route 22, for 400 m, Jarrahdale.
- Tourist Drive 206, for 11 km, between Jarrahdale and Keysbrook.
History:
- 1 July 1853: Colonial Secretary Frederick Barlee announced a new proposal for a Perth–Pinjarra–Bunbury route along the foothills of the Darling Scarp. 2
- 1864: Work commences on construction of the route announced in 1853 by two gangs of convicts.
- 1876: Construction completed of the route announced in 1853.
- July 1941: The name South Western Highway officially adopted. 3
- 1980s: National Route 1 rerouted via Old Coast Road, SR20 introduced to the former NR1 alignment between Armadale and Bunbury.
Armadale to Pinjarra
Pinjarra Welcome Sign:
Town name sign as you enter the town of Pinjarra. July 2008.
Image © Paul Rands
UPDATED Advance Directional Sign:
AD sign on South Western Hwy approaching Pinjarra Rd, May 2020. Click or tap here for a photo of this location by Paul Rands from July 2008, featuring a black sign.
Image © Terry Siva
Advance Directional Sign:
AD sign for Pinjarra-Williams Road situated at the Henry Street intersection in Pinjarra near the Murray River. July 2008.
Image © Paul Rands
Distance Sign:
RD sign as you head northbound from Pinjarra, July 2008.
Image © Paul Rands
Entering North Dandalup:
Northbound entering the town of North Dandalup, July 2008.
Image © Paul Rands
Distance Sign:
RD sign inside the town centre of North Dandalup. July 2008.
Image © Paul Rands
Entering Keysbrook:
Northbound entering the town of Keysbrook, July 2008.
Image © Paul Rands
Advance Directional Sign:
AD sign in the town of Serpentine approaching Karnup Road, July 2008.
Image © Paul Rands
Advance Directional Sign:
Northbound approaching the junction with Jarrahdale Road (SR22) at Mundijong, July 2008.
Image © Paul Rands
Jarrahdale Road Intersection:
Looking northbound through the Jarrahdale Rd (SR22) intersection, July 2008.
Image © Paul Rands
Advance Directional Sign:
Northbound approaching Watkins Road (SR22) at Mundijong, July 2008.
Image © Paul Rands
Watkins Road Intersection:
Northbound as you travel through the Watkins Road intersection at Mundijong, July 2008.
Image © Paul Rands
Distance Sign:
RD sign after the Watkins Road intersection at Mundijong. July 2008.
Image © Paul Rands
Entering Byford:
Travelling northbound into the town of Byford, July 2008.
Image © Paul Rands
Approaching Abernethy and Beenyup Roads:
Looking northeast at Byford, approaching Abernethy & Beenyup Roads. April 2009.
Image © Paul Rands
Advance Directional Sign:
AD sign approaching the Thomas Road (SR21) intersection at Byford, July 2008.
Image © Paul Rands
Intersection Directional Signs:
ID sign assemblies at the Thomas Rd (SR21) intersection at Byford. April 2009.
Image © Paul Rands
Approaching Eleventh Road:
Looking northeast at Wungong, approaching Eleventh Road. April 2009.
Image © Paul Rands
Entering Armadale:
Looking northeast as you enter Armadale, nears Hobbs Drive. April 2009.
Image © Paul Rands
Approaching William Street & Bedfordale Hill Road:
Looking northeast at Armadale, approaching William St & Bedfordale Hill Rd. April 2009.
Image © Paul Rands
Third Road Intersection:
Looking northeast at Third Rd in Armadale. April 2009.
Image © Paul Rands
Approaching Albany Highway & Armadale Road:
Advance directional sign approaching the intersection with Albany Hwy (SR30) and Armadale Rd (SR14) in Armadale. April 2009.
Image © Paul Rands
Albany Highway & Armadale Road:
Flashing warning lights approaching the traffic signs at the Armadale Rd / Albany Hwy junction in Armadale, which is the northern terminus of SR20. April 2009.
Image © Paul Rands
Intersection Directional Sign:
AD sign assembly at the junction of Armadale Rd and Albany Hwy in Armadale. April 2009.
Image © Paul Rands
Intersection Directional Sign:
AD sign assembly at the junction of Armadale Rd and Albany Hwy in Armadale. April 2009.
Image © Paul Rands
Pinjarra to Armadale
Intersection Directional Sign:
ID facing the eastern terminus of SR21, Thomas Road at Darling Downs. December 2007.
Image © Paul Rands
Entering Byford:
Southbound entering the town of Byford. December 2007.
Image © Paul Rands
Trailblazer:
Southbound after the Thomas Rd intersection at Byford. December 2007.
Image © Paul Rands
Byford Town Centre:
Southbound in Byford near Beenyup Road and Abernethy Road, December 2007.
Image © Paul Rands
Approaching Watkins Road:
Southbound advance directional sign for the Watkins Rd intersection in Jarrahdale, December 2007.
Image © Paul Rands
Watkins Road Intersection:
Southbound at Watkins Rd Jarrahdale. December 2007.
Image © Paul Rands
Approaching Jarradale Rd:
Southbound at Jarrahdale approaching SR22, Jarrahdale Rd, December 2007.
Image © Paul Rands
Jarrahdale Road Junction:
Southbound, Jarrahdale, December 2007.
Image © Paul Rands
Distance Sign:
Southbound RD sign in Jarrahdale, south of Jarrahdale Road, December 2007.
Image © Paul Rands
Serpentine River:
Southbound as you pass the AD sign for Karnup Road and Falls Road at Serpentine. The bridge is for the Serpentine River, December 2007.
Image © Paul Rands
Serpentine, Southbound:
Looking through Serpentine at the junction with Karnup and Falls Roads, December 2007.
Image © Paul Rands
Entering Keysbook:
Southbound at Keysbrook, December 2007.
Image © Paul Rands
Entering North Dandalup:
Town sign as you enter North Dandalup. December 2007.
Image © Paul Rands
North Dandalup:
Southbound through the town of North Dandalup, December 2007.
Image © Paul Rands
Black AD Sign:
Black advance directional sign in North Dandalup approaching Delpark Road. Southbound, December 2007. This sign has since been replaced.
Image © Paul Rands
Distance Sign:
Distance sign and overtaking lanes as you leave North Dandalup. Southbound, December 2007.
Image © Paul Rands
Entering Historic Pinjarra:
Sign denoting the town of Pinjarra and its historical significance. Southbound, December 2007.
Image © Paul Rands
Level Crossing:
Crossing the railway crossing in Pinjarra. Southbound, December 2007.
Image © Paul Rands
AD Sign:
Advance directional sign approaching Pinjarra-Willams Road in Pinjarra. Southbound, December 2007.
Image © Paul Rands
Advance Directional Sign:
AD sign on Pinjarra-Williams Rd at Pinjarra, approaching South Western Hwy (SR20), April 2016.
Image © Paul Rands
Murray River:
Crossing the Murray River in Pinjarra. Southbound, December 2007.
Image © Paul Rands
George Street Pinjarra:
Pinjarra's CBD as SR20 passes through, southbound, December 2007.
Image © Paul Rands
Corner of George & Peel Street:
Pinjarra's CBD. Southbound, December 2007.
Image © Paul Rands
Distance Sign:
RD sign as you leave Pinjarra. Southbound, December 2007.
Image © Paul Rands
2 NK Perry, History and Present Potentialities of the Old Coast Road from Mandurah to Bunbury.
3 South Western Advertiser, Armadale-Kelmscott Road Board, 25 July 1941.