Gawler Bypass is a major north–south route in the outer northern suburbs of the city of Adelaide, South Australia. It had the national designation of National Highway A20 north of the Northern Expressway, while south of this intersection it had the state designation of A52.[1][full citation needed] From late 2016, the entire length was designated A20, corresponding to the Northern Expressway being designated M2 (instead of M20).[2]

It is a freeway standard route connecting Main North Road to the Sturt Highway, bypassing Gawler. Major exits include Angle Vale Road, Two Wells Road, Northern Expressway, Mallala Road and Horrocks Highway (formerly Main North Road). Each of these exits also have minor roads leading into Gawler.

The route was built in 1963 in an attempt to redirect traffic on the national highway out of Gawler town centre and has been upgraded and realigned several times since then.


The first Gawler bypass was planned in the 1950s[3] and built as a single two-lane carriageway around the town in 1963 with at-grade intersections and carried 3,000 vehicles per day.[4] It ended at a tee-junction at the southern end, and followed an alignment that included what is now the southbound on-ramp and Brereton Road, Jack Cooper Drive over the Winckel Bridge,[5] and Paternoster Drive to the railway bridge.

The next advance developed the road to dual carriageway with grade-separated intersections at the southern end in the 1980s and new bridges over the Gawler River. When it was approved, the 1963 bypass was carrying 7000 vehicles per day, and 300 collisions had been recorded between 1977 and 1982.[4]

Improvements to the Sturt Highway have included upgrades to the northern end of the Gawler Bypass to facilitate smooth flow between them, completed in 2010.[6]

The construction of the Northern Expressway in 2010 resulted in realignment of the northbound carriageway as part of creating a grade-separated intersection with smooth flow between the northern section of the Gawler bypass and both the Northern Expressway and the southern part of the Gawler bypass. As both roads lead broadly south, there is no provision to turn directly from one to the other.

Exits and interchanges

LightHewett, Gawler Belt00.0 Sturt Highway continues towards Nuriootpa, Mildura and Sydney
Horrocks Highway (Main North Road) – Roseworthy, Riverton, Clare / Main North Road – Hewett, Gawler
Thiele Highway (Also known as Freeling Road)Kapunda, Eudunda, Morganvia Main North Road
Gawler Belt, Willaston1.50.93Redbanks Road – Mallala, Balaklava / Gawler, WillastonAlso known as Mallala Road
Gawler Belt, Willaston, Reid3.92.4Morgan railway line
Ward Belt, Reid, Buchfelde4.12.5 Northern ExpresswayAdelaide, Port Adelaideramps on north side only
Reid, Buchfelde4.62.9Two Wells Road – Gawler West, Two Wellsramps on north side only
Light, GawlerEvanston, Evanston GardensGawler River
GawlerEvanston, Hillier5.73.5Jack Cooper Drive – Evanston, Evanston Gardenssouth side ramps only
Evanston, Evanston Gardens6.23.9Gawler railway line
Evanston, Evanston Gardens, Evanston Park, Evanston South74.3 Adelaide RoadEvanston, Gawlercontinues as Main North Road
Route diagram
Sturt Highway Australian National Route A20.svg
Australian National Route A20.svg Sturt Highway
Thiele Highway Australian Alphanumeric State Route B81.png Give Way
Horrocks Highway Australian Alphanumeric State Route B82.svg Give Way
Give Way Main North Road
Redbanks Road Give Way
Roundabout Redbanks Road
(Disused) Morgan railway line
Morgan railway line (Disused)
Northern Expressway Australian Alphanumeric State Route M2.png Grade Separated Intersection
Two Wells Road Give Way
Gawler River
Gawler River
RoundaboutRyde Street
Jack Cooper Drive Give Way
Gawler railway line
Gawler railway line
Dawson Road
Dawson Road
Grade Separated Intersection Australian Alphanumeric State Route B19.svg Adelaide Road
Main North Road Australian Alphanumeric State Route A20.png
Australian Alphanumeric State Route A20.png Main North Road

See also

Australia road sign W5-29.svg Australian Roads portal


  1. ^ "Nearmap". Nearmap. 5 December 2010. Retrieved 5 December 2010.(subscription required)
  2. ^ "Road Route Numbers (Trail Blazer)". Data SA. Government of South Australia. 8 November 2016. Retrieved 16 October 2017.
  3. ^ "Main North Road By-Pass Altered". The Bunyip (5251). South Australia. 23 February 1951. p. 3. Retrieved 28 June 2016 – via National Library of Australia.
  4. ^ a b Peter Morris, Minister for Transport Australia (9 May 1984). "$18 Million Gawler Bypass gets Go Ahead". Media Release. 71/84. Retrieved 28 June 2016.
  5. ^ "NEW PLAN OF MAIN NORTH ROAD". The Bunyip (5237). South Australia. 3 November 1950. p. 1. Retrieved 28 June 2016 – via National Library of Australia.
  6. ^ "Sturt Highway Upgrade". Department of Planning, Transport and Infrastructure. Retrieved 8 February 2017.
  7. ^ "Property Location Browser". Department of Planning, Transport and Infrastructure. Retrieved 29 May 2015.