 The South Australian section was named Eyre Highway on 20 May 1943 , with the portion from Murat Bay ( Ceduna ) to the state border declared a main road . Eyre Highway was gazetted in Western Australia on 11 June 1943 , and included the road from Coolgardie to Norseman until Coolgardie – Esperance Highway was gazetted on 16 August 1957 . 
