[3] Approximately 90 kilometres (56 mi) has 'wide centre lines', providing a 1.2 metres (3 ft 11 in) boundary between traffic travelling in opposite directions.

[4] Generally, the quality of Dukes Highway is of a high standard, with the entire road having wide lane widths and sealed shoulders with at least five (and usually six) metres clear beyond the edge line.

[6] Dukes Highway runs through the northern part of the Limestone Coast region of South Australia.

The route and many of the settlements, including Bordertown, were established in the 1850s to supply water to horses for the gold escorts from the Victorian goldfields to Adelaide.

The higher price was offered to stop the South Australian economy from collapsing, as all the labourers were heading to the Victorian Goldfields.