The Princes Highway is a major road in Australia, extending from Sydney to Adelaide via the coast through the states of New South Wales, Victoria and South Australia. It has a length of 1,941 kilometres (1,206 mi) or 1,898 kilometres (1,179 mi) via the former alignments of the highway, although these routes are slower and connections to the bypassed sections of the original route are poor in many cases.
The Pacific Highway is a 780-kilometre-long (485 mi) national highway and major transport route along the central east coast of Australia, with the majority of it being part of Australia's Highway 1. It no longer includes former sections of the highway between Brunswick Heads and Brisbane that have been legally renamed Pacific Motorway or Gold Coast Highway. As such, the highway stops short of the Queensland border near the Gold Coast.
The Sturt Highway is an Australian national highway in New South Wales, Victoria, and South Australia. The Sturt Highway is an important road link for the transport of passengers and freight between Sydney and Adelaide and the regions situated adjacent to the route.
The Princes Motorway is a 55-kilometre (34 mi) predominantly dual carriage untolled motorway that links Sydney to Wollongong and further south through the Illawarra region to Albion Park Rail. Part of the Australian Highway 1 network, the motorway is designated with the route number M1.
The Southern Expressway is an 18.5 km (11.5 mi) freeway in the southern suburbs of Adelaide, South Australia, between Bedford Park and Old Noarlunga. It is the southern part of the North–South Corridor which extends the full length of Adelaide and is being built to urban freeway standard.
The Pacific Motorway is a motorway in Australia between Brisbane, Queensland, and Brunswick Heads, New South Wales, through the New South Wales–Queensland border at Tweed Heads.
Main North Road is the major north-south arterial route through the suburbs north of the Adelaide City Centre in the city of Adelaide, South Australia. It continues north through the settled areas of South Australia and is a total of 307 kilometres (191 mi) long, from North Adelaide to 21 kilometres (13 mi) out of Port Augusta. It follows the route established in the early years of the colony by explorer John Horrocks and was a major route for farmers and graziers to reach the capital, passing through rich farmland and the Clare Valley wine region. In 2011, the section of road between Gawler to Wilmington was renamed Horrocks Highway.
Port Wakefield is a town at the mouth of the River Wakefield, at the head of the Gulf St Vincent in South Australia. It was the first government town to be established north of the state capital, Adelaide. Port Wakefield is situated 98.7 kilometres from the Adelaide city centre on the Port Wakefield Highway section of the A1 National Highway.
South Road, also known as Main South Road, is a major north–south conduit in Adelaide and Fleurieu Peninsula in South Australia. It is one of Adelaide's most important arterial and bypass roads.
The Port River Expressway is a 5.5-kilometre (3.4 mi) freeway-grade road. The expressway links Port Adelaide and the LeFevre Peninsula to the northern suburbs of Adelaide and major interstate routes via Salisbury Highway (A9) to Port Wakefield Road (A1) and the Max Fatchen Northern Expressway (M2) to Perth, Darwin and Sydney.
The Northern Expressway, also known as the Fatchen Northern Expressway, is a 23 kilometre long controlled-access highway in Adelaide, South Australia. It travels from Gawler to Port Wakefield Road. 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. Since March 2020, the North–South Motorway continues west of Port Wakefield Road and intersects the Port River Expressway (A9) to reach the harbour at Port Adelaide. These are the northernmost two parts of the North–South Corridor.
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. From late 2016, the entire length was designated A20, corresponding to the Northern Expressway being designated M2.
The North–South Motorway is an incomplete planned motorway traversing the inner western suburbs of Adelaide from Waterloo Corner in the north to Bedford Park in the south. Progressively constructed in stages since 2010, once complete it will replace the adjacent South Road as Adelaide's main north-south roadway and form the central section of the North–South Corridor, being flanked north and south by the Northern Expressway and Southern Expressway, respectively.
The North–South Corridor is a series of component motorways travelling through Adelaide, South Australia that will eventually form a continuous link from Old Noarlunga in the outer southern metropolitan Adelaide suburbs through to Gawler in northern metropolitan Adelaide, comprising a distance of 78km. Under South Australia's road route system, the corridor is signed as route M2.
The Augusta Highway is the part of Australia's ring route located in South Australia between Port Wakefield and Port Augusta. It was named Augusta Highway in 2011, and was formerly known simply as Highway One and also as the Princes Highway, despite not being continuous to the Princes Highway in the southeast of the state.
The Copper Coast Highway is a highway in South Australia which branches off from the Augusta Highway 2 km north of Port Wakefield and heads northwest across the top of Yorke Peninsula to Kadina and ends at the Spencer Gulf town of Wallaroo.
The Yorke Highway is the main road from Adelaide to the southern parts of the Yorke Peninsula in South Australia. It runs from the northeast to the southwest of the peninsula. It branches off of the Copper Coast Highway after rounding the top of Gulf St Vincent, runs down the coast to Ardrossan then inland through Maitland to the Spencer Gulf coast at Hardwicke Bay then through Warooka to the south coast at Marion Bay and Stenhouse Bay on Investigator Strait.
The Joy Baluch AM Bridge is a bridge across Spencer Gulf between Port Augusta and Port Augusta West in South Australia. It carries Highway 1 and is a key road link on both east–west and north–south road routes in Australia. The western end leads to Eyre Peninsula, the Eyre Highway and the Stuart Highway. The eastern end leads to the Augusta Highway towards Adelaide, Victoria and New South Wales.
A1 (2017-present)
Main North Road 
