Carnarvon Highway is a state highway in Queensland and New South Wales, Australia, linking the township of Rolleston in Queensland's Central Highlands Region, via the town of St George, eventually to Moree in northern New South Wales. It is the main access road to the Carnarvon National Park, and serves as a strategic route to take B-doubles and other large vehicles (which cannot use the Bruce Highway) to the Queensland ports north of Rockhampton. Route Carnarvon Highway starts at the intersection with Dawson Highway just west of Rolleston in Queensland, and heads in southerly direction until it reaches Roma, where it shares a short concurrency with Warrego Highway, and continues south to St George, where it meets Moonie, Balonne, and Castlereagh Highways. It crosses the state border at Mungindi to eventually terminate at the town of Moree, in New South Wales. History The passing of the Main Roads (Amendment) Act of 1929 (which amended the original Main Roads Act of 1924) through the Parliament of New South Wales on 8 April 1929 provided for the declaration of State Highways, Trunk Roads and Main Roads, partially funded by the State government through the Main Roads Board (later the Department of Main Roads, and eventually Transport for NSW). Main Road 232 was declared on 21 November 1933, from the intersection with Main Road 338 (Moree-Boggabilla Road, later to become Newell Highway) at Moree, via Ashley, Garah and Boomi to the state border with Queensland at Boonangar, and Main Road 367 was declared on 23 March 1937 from the intersection with Main Road 232 at Garah to the state border with Queensland at Mungindi. The passing of the Roads Act of 1993 through the Parliament of New South Wales updated road classifications and the way they could be declared within New South Wales. Under this act, Carnarvon Highway was declared as State Highway 28 on 7 August 1998, from the intersection with Newell Highway at Moree via Ashley and Garah to the state border with Queensland at Mungindi, subsuming Main Road 367; the southern end of Main Road 232 was truncated to meet Carnarvon Highway at Garah. The highway today, as Highway 28, still retains this declaration. It was formerly known as Carnarvon Developmental Road north of Roma. Queensland signed its portion of Carnarvon Highway as National Route 55 between 1983 and 1997. However, New South Wales had previously signed Castlereagh Highway between