Main Roads Western Australia controls the major roads in the state's Goldfields-Esperance region. While the region is the state's largest, the major roads are restricted to the region's western and southern edges. From the major population centres of Kalgoorlie and Coolgardie, Great Eastern Highway heads west towards Perth via the Wheatbelt (Western Australia); Coolgardie–Esperance Highway leads south to the port of Esperance via Norseman; and Goldfields Highway proceeds north to Wiluna and then on to the Mid West Region. From Norseman, Eyre Highway takes interstate traffic east across the Nullarbor Plain and into South Australia.