Question: Which main highway taking traffic to the north of Adelaide passes through this city of South Australia that belongs to Division of Wakefield? 

Context paragraphs:
Proof Range, South Australia: Proof Range is a locality in the Australian state of South Australia located on the eastern coastline of Gulf St Vincent about 74 km north-northwest of the Adelaide city centre and about 6 km south of the town centre of Port Wakefield.  Its boundaries were created in January 2000 in respect of the “long established name.”  Its name is derived from the use of the land within its extent for the testing of weapons and ammunition as part of the Port Wakefield Proof and Experimental Establishment.  Proof Range is located within the federal Division of Wakefield, the state electoral district of Goyder and the local government area known as the Wakefield Regional Council.

Nantawarra, South Australia: Nantawarra is a locality in South Australia located about 120 km north of the Adelaide city centre and within the local government area known as the Wakefield Regional Council.  The locality occupies land on both sides of Highway 1 between Port Wakefield in the south and Snowtown in the north.  Nantawarra is recognisable from a distance by the presence of grain silos immediately just east of the Adelaide-Port Augusta railway line.  The name Nantawarra may derive from the word "nantuwara" (meaning a northern yerta, or family group) in Kaurna, the language of the indigenous people of this part of South Australia.

Division of Wakefield: The Division of Wakefield is an Australian electoral division in the state of South Australia.  The rural 6,407 km² seat is really a hybrid rural-urban electorate that stretches from Salisbury in the outer northern suburbs of Adelaide at the south of the seat right through to the Clare Valley at the north of the seat, 135 km from Adelaide.  It includes the suburbs of Elizabeth, Craigmore, Munno Para, and part of Salisbury, and the towns of Balaklava, Clare, Freeling, Gawler, Kapunda, Mallala, Riverton, Tarlee, Virginia, Williamstown, and part of Port Wakefield.

Virginia, South Australia: Virginia is a town on the rural outskirts of Adelaide, the capital city of South Australia.  Port Wakefield Road, the main highway taking traffic to the north of Adelaide, passes through the area and used to pass straight through Virginia.  Market gardening is the main activity there.

South Eastern Freeway: The South Eastern Freeway (previously signposted as Princes Highway) is a 76 kilometre controlled-access highway in South Australia.  It carries traffic over the Adelaide Hills between Adelaide and the River Murray, near Murray Bridge, connecting via the Swanport Bridge to the Dukes Highway which is the main road route to Victoria.  It is often referred to by South Australians simply as "the Freeway", as it was the first freeway in South Australia, and is still the longest, and the only one with "Freeway" in its name rather than "Expressway" or "Highway".  It is a part of the National Highway network linking the state capital cities Adelaide to Melbourne and signed as National Highway M1.  The South Eastern Freeway includes 500-metre-long twin-tube tunnels (the Heysen Tunnels) in the descent towards Adelaide, the first of their kind on the National Highway.  It is designated as the M1.

Interstate 40 in Arkansas: Interstate 40 (I-40) is an east–west Interstate Highway that has a 284.69 mi section in the U.S. state of Arkansas connecting sections in Oklahoma to Tennessee.  The route enters Arkansas from the west just north of the Arkansas River near Dora.  It travels eastward across the northern portion of the state connecting the cities of Fort Smith, Clarksville, Russellville, Morrilton, Conway, Little Rock, Forrest City, and West Memphis.  I-40 continues into Tennessee heading through Memphis.  The highway has major junctions with Interstate 540 at Van Buren (the main highway connecting to Fort Smith), Interstate 49 at Alma (the main highway connecting to Fayetteville and Bentonville), Interstate 30 in Little Rock (the Interstate linking south to Texarkana and Dallas, Texas) and Interstate 55 to Blytheville.

Northern Expressway: The Northern Expressway (route M2) (formerly route M20), also known as the Fatchen Northern Expressway, is a 23 kilometre long controlled-access highway in Adelaide, South Australia.  It travels from Gawler (on National Highway A20, the Sturt Highway) to Port Wakefield Road (on National Highway A1).  The road has been built to four-lane standard and provides a faster route between Adelaide and Gawler, whilst reducing the amount of traffic on Main North Road, which passes through the heart of the northern suburbs and is interspersed with frequent traffic lights.  It also allows freight vehicles to avoid residential areas and go straight to Port Wakefield Road and onto the Port River Expressway (A9) to reach the harbour at Port Adelaide.

North Tarrant Express: The North Tarrant Express (NTE) project is a total highway reconstruction of the Interstate 820 (I-820) and State Highway 121/State Highway 183 (SH 121/SH 183, Airport Freeway) corridor between I-35W and Industrial Boulevard in Northeast Tarrant County, Texas.  The NTE and the Texas Department of Transportation (TxDOT) anticipate the new highway system will relieve traffic congestion, improve safety on its roadways and have integrated plans for the anticipated traffic growth in one of the country’s fastest developing regions.  When the improvements are completed, the $2.5 billion North Tarrant Express will have upgraded main highway lanes, continuous frontage roads, and 13.3 mi of newly added tolled managed lanes (TEXpress Lanes).

Buckland Park, South Australia: Buckland Park is a suburb on the rural outskirts of Adelaide, the capital city of South Australia.  Port Wakefield Road, the main highway taking traffic to the north of Adelaide, passes the eastern boundary.  The northern boundary is the Gawler River, and the western side is Gulf St Vincent.  Buckland Park is named after an early pioneer homestead in the area.  Buckland Park is the site of the Adelaide region weather radar.  Market gardening is the main activity as the soil is predominantly on the flood plain of the lower Gawler River.  Walker Corporation proposes to develop a large housing development in the area with up to 33,000 residents by 2036, however some critics are concerned about the isolation from the rest of Adelaide and the threat of flooding.

Port Wakefield Road: Port Wakefield Road is an important Australian highway.  It connects Adelaide, the South Australian capital, to the Yorke Peninsula, Port Augusta, northern and western South Australia, the Northern Territory and Western Australia.  It is designated National Highway A1 and a part of the National Highway.  It is named after Port Wakefield, the first government town north of Adelaide.

Supporting paragraphs: Division of Wakefield Virginia, South Australia
Answer: Port Wakefield Road