Gawler Bypass

The first Gawler bypass was planned in the 1950s.{{cite news |url=http://nla.gov.au/nla.news-article96860109 |title=Main North Road By-Pass Altered. |newspaper=The Bunyip |issue=5251 |location=South Australia |date=23 February 1951 |access-date=28 June 2016 |page=3 |via=National Library of Australia}} It was first built as a single two-lane carriageway around the town in 1963, with at-grade intersections, and carried 3,000 vehicles per day.{{cite web |url=http://trove.nla.gov.au/version/213905714 |title=$18 Million Gawler Bypass gets Go Ahead |date=9 May 1984 |id=71/84 |work=Media Release |author=Peter Morris, Minister for Transport Australia |access-date=28 June 2016}} It ended at a tee-junction with Main North Road 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,{{cite news |url=http://nla.gov.au/nla.news-article96855858 |title=NEW PLAN OF MAIN NORTH ROAD. |newspaper=The Bunyip |issue=5237 |location=South Australia |date=3 November 1950 |access-date=28 June 2016 |page=1 |via=National Library of Australia}} and Paternoster Drive to the railway bridge.

The road was rebuilt in the mid-1980s as a dual carriageway, with grade-separated intersections at the southern end in a new alignment, with new bridges over the Gawler River. At the time of approval, the bypass was carrying 7,000 vehicles per day. 300 collisions had been recorded between 1977 and 1982. It began construction at the end of 1985. Its total cost was $18 million, of which $13 million came from Federal funding.

In 2010, construction of the Northern Expressway realigned the northbound carriageway as part of creating a grade-separated intersection, with smooth traffic flow between the northern section of the bypass and both the Northern Expressway and the southern part of the bypass.{{cite web |url=http://www.dtei.sa.gov.au/infrastructure/sturt_highway_upgrade/content |title=Sturt Highway Upgrade |publisher=Department of Planning, Transport and Infrastructure |access-date=8 February 2017 |archive-url=https://web.archive.org/web/20091024115151/https://www.dtei.sa.gov.au/infrastructure/sturt_highway_upgrade/content |archive-date=24 October 2009 }} As both roads lead broadly south, there is no provision to turn directly from one to the other. Road definitions also changed: the definition of Sturt Highway was lengthened a short distance west along the bypass to meet the expressway, resulting in a shortening of the bypass by a distance of 3.5km.

It was designated National Route 20, updated to National Highway 20 in 1992, and to National Highway A20 in 1998. This was changed to route A52, south of the intersection with Northern Expressway when it opened in 2010. From late 2016, the entire length was re-designated route A20. The Northern Expressway was re-designated route M2, instead of route M20.{{cite web |url=https://data.sa.gov.au/data/dataset/trailblazer-roads |title=Road Route Numbers (Trail Blazer) |work=Data SA |publisher=Government of South Australia |date=8 November 2016 |access-date=16 October 2017}}

{{AUSinttop|LGA_ref={{cite web |url=https://location.sa.gov.au/viewer/?map=hybrid&x=136.19383&y=-32.61774&z=7&uids=11 |title=Location SA Map viewer with LGA layers |publisher=Government of South Australia |accessdate=16 June 2022}}|location_ref={{cite web |url=https://location.sa.gov.au/viewer/?map=hybrid&x=136.19383&y=-32.61774&z=7&uids=19 |title=Location SA Map viewer with suburb layers |publisher=Government of South Australia |accessdate=16 June 2022}}|length_ref=}}

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|location_special={{SAcity|Ward Belt}}–{{SAcity|Reid}}–{{SAcity|Buchfelde}} tripoint

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|road={{AUshield|SA|A20}} Sturt Highway (A20){{SAcity|p=on|Nurioopta|Renmark}}, {{VICcity|Mildura}}, {{NSWcity|Wagga Wagga}}

|notes=Northern terminus of bypass, route A20 continues north along Sturt Highway

}}

{{SAint

|type=incomplete

|km=none

|road={{AUshield|SA|M2}} Northern Expressway (M2){{SAcity|p=on|Waterloo Corner|Port Adelaide|Adelaide}}

|notes=Northbound exit and southbound entrance only

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{{SAint

|location_special={{SAcity|Reid}}–{{SAcity|Buchfelde}} boundary

|type=incomplete

|km=1.5

|road={{AUshield|SA|B77}} Two Wells Road (B77){{SAcity|p=on|Gawler West|Two Wells}}

|notes=Northbound entry and southbound exit only

}}

{{Jctbridge

|river=Gawler River

|km=2.2

|bridge=Bridge over the river (bridge name unknown)

}}

{{SAint

|LGAT=Gawler

|LGAspan=4

|location_special={{SAcity|Evanston}}–{{SAcity|Hillier}} boundary

|type=incomplete

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|road=Jack Cooper Drive{{SAcity|p=on|Evanston|Evanston Gardens}}

|notes=Southbound entry and northbound exit only

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{{SAint

|location_special={{SAcity|Evanston}}–{{SAcity|Evanston Gardens}} boundary

|km=3.7

|bridge=Gawler railway line

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{{SAint

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|notes=North-eastbound entry and south–western exit only

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{{SAint

|type=trans

|km=none

|road={{AUshield|SA|A20}} Main North Road (A20){{SAcity|p=on|Elizabeth|Gepps Cross|North Adelaide}}

|notes=Southern terminus of bypass, route A20 continues southwest along Main North Road

}}

{{Jctbtm |keys=trans,incomplete |conv=no}}

{{Routemap

|title = {{big|Route diagram}}

|map=

Sturt Highway {{AUshield|SA|A20}}! !\\\LSTR\LSTR\\\~~{{AUshield|SA|A20}} Sturt Highway

\\\STRg\STRf\\\

\\STRc2\ABZg3\STR\\\

\\STR+1\STR+c4\STR\\\

LSTRq\STRfq\KRZu\STRr\STR\\\

Northern Expressway {{AUshield|SA|M2}} File:UK motorway symbol.svg! !LSTRq\STRgq\KRZu\STRq\ABZgr\\\

\\ABZg2\STRc3\ABZg2\STRc3\\

\\STR+c1\STR+4\STR+c1\STR+4\\

{{AUshield|SA|B77}} Two Wells Road File:UK traffic sign 602.svg! !LSTRq\STRq\ABZqlr\KRZu\KRZu\ABZqlr\STR+r\

Gawler River! !WASSERq\WASSERq\WASSER+r\STRg\STRf\WASSER+l\WBRÜCKE1\WASSERq~~Gawler River

\\WASSERl\WBRÜCKE1\WBRÜCKE1\WASSERr\ABZgl+l\LSTRq~~File:Australia road sign R1-3.svgRyde Street

Jack Cooper Drive File:UK traffic sign 602.svg! !LSTRq\STRq\ABZq+lr\KRZo\KRZo\ABZq+lr\STRr\

\\STR2\STR+c3\STR+c2\STR3\\

\\STRc1\ABZg+4\ABZg+1\STRc4\\

\\\STRg\STRf\\\

Gawler railway line! !uLSTRq\uSTRq\uSTRq\mKRZo\mKRZo\uSTRq\uSTRq\uLSTRq~~Gawler railway line

Dawson Road! !LSTRq\STRq\STRq\KRZo\KRZo\STRq\STRq\LSTRq~~Dawson Road

\\\STR\STR\\\

\\STR+l\KRZo\KRZo\ABZq+l\STRq\LSTRq~~File:UK motorway symbol.svg {{AUshield|SA|B19}} Adelaide Road

\\STR2\STR+c3\STR+c2\STR3\\

\\STRc1\ABZg+4\ABZg+1\STRc4\\

\\\STRg\STRf\\\

Main North Road {{AUshield|SA|A20}}! !\\\LSTR\LSTR\\\~~{{AUshield|SA|A20}} Main North Road

}}

{{clear}}

{{portal-inline|Australian Roads}}

{{Reflist}}

{{Road infrastructure in Adelaide}}

{{Road infrastructure in South Australia}}

Category:Highways in South Australia

Category:Roads in Adelaide

Category:Freeways and highways in Adelaide

Category:Gawler, South Australia

Category:Bypasses in Australia