Its extensive road network connect the state's regional centres and other towns, few of which have populations greater than 10,000.
Horses, bullocks and camels remained as common forms of transport in remote areas until trucks became widely available following the Second World War.
A thriving coastal trade rapidly developed with commodities from rural ports being transported to Adelaide.
With its lack of natural harbours and relatively calm gulf waters, jetties came to play an important role.
Paddle steamers provided effective bulk transport for agricultural goods on the Murray River giving access to inland regions and into Victoria and New South Wales.
The central part of the city on the plain between the Adelaide Hills and the coast features a grid of main roads with numerous intersections.
The network covers the entire metropolitan area extending from Gawler in the north, to Sellicks Beach in the south, a distance of over 90 km.
Country bus services between towns and interstate are provided by private companies such as Stateliner, Firefly Express and Greyhound Australia.
With its extensive road network, trucks play a major role in South Australian transport.
[6] Commuter trains run in Adelaide on a broad gauge network of seven lines with 89 stations, totalling 125.9 km.
Adelaide Airport offers multiple daily flights to the other mainland capitals and with Jetstar, Qantas, Tiger Airways and Virgin Australia.
Services also operate frequently to mining towns such as Roxby Downs and Olympic Dam carrying large numbers of fly-in fly-out workers.
The airport also offers daily international flights to major Asian hubs such as Singapore, Guangzhou, Dubai, Doha, Kuala Lumpur–International and Denpasar.
Some minor intrastate air freight services are provided by smaller jets and turboprop aircraft, especially to outlying areas of the state.
[13] The state has one major ferry service operating to Kangaroo Island between Cape Jervis and Penneshaw.