(A-double or B-triple) up to are permitted on Eyre Highway, with Quads up to 49.5 metres (163 feet) between Ceduna and Colona Station turnoff but are limited to . The Western Australian section of Eyre Highway is on the western side of the Nullarbor Plain; the South Australian section crosses the eastern section of the Nullarbor Plain, and the top of the Eyre Peninsula. The Nullarbor gets its name from Latin for "no tree", and the typical view is that of a straight highway and practically unchanging flat saltbush-covered terrain, although some parts are located on ridges. The Eyre Peninsula has been extensively cleared for agriculture, although there are remnant corridors of native eucalyptus woodland alongside its roads. Main Roads Western Australia and the Department for Infrastructure & Transport in South Australia monitor traffic volume across the states' road networks, including various locations along Eyre Highway. In Western Australia, the recorded traffic volumes ranged between 430 and 760 vehicles per day in 2013/14. In South Australia, the estimated annual average daily traffic as of September 2015 varied between 500 and 1500 west of Lincoln Highway, and was 2700 to the east. Eyre Highway was assessed by the Australian Automobile Association in 2011 to be among the lowest risk highways in the country, based on total number of casualty crashes per length of road. However, individual risk based on casualty crash rates per vehicle kilometre travelled was assessed as high for the section east of Yalata to Fowlers Bay, medium for a section from Fowlers Bay to Ceduna, low-medium between Ceduna and Port Augusta, and low west of Yalata. In 2013, Eyre Highway similarly received a lower safety rating for the South Australian sections, compared to the Western Australian section. Out of five stars, approximately 10% was rated as one- or two-star in Western Australia, generally towards the Norseman end, and 91% was rated three- or four-star. In South Australia, 49% was rated as one- or two-star, mostly from Yalata to Ceduna, and across the Eyre Peninsula, with the remaining 51% rated as three- or four-star. Western Australia Eyre Highway begins at the town of Norseman, on the Coolgardie–Esperance Highway. Apart from Eucla, from the South Australia border, roadhouses serving the highway are the only settlements on the stretch through Western Australia. These are located apart, at Balladonia, Caiguna, Cocklebiddy, Madura, and Mundrabilla. The section between Balladonia and Caiguna includes what