The passing of the Country Roads Act of 1912[5] through the Parliament of Victoria provided for the establishment of the Country Roads Board (later VicRoads) and their ability to declare Main Roads, taking responsibility for the management, construction and care of the state's major roads from local municipalities. Traralgon-Gormandale Road was declared a Main Road, from Traralgon to Flynns Creek on 1 December 1913,[2] and from Flynns Creek to Gormandale on 23 March 1914.[6] The road was later renamed Yarram-Traralgon Road and declared a Main Road by the Country Roads Board from at least 1955.[7]
The construction of the open-cut coal mine for Loy Yang Power Station in the late 1970s required the road to be re-routed along Traralgon Creek Road (west of the coal mine) and Bartons Lane (south of the coal mine); the former alignment is now known as Craigburn Place (to the mine's north) and Broomfields Lane (to the mine's south-east).
The passing of the Transport Act of 1983[8] (itself an evolution from the original Highways and Vehicles Act of 1924[9]) provided for the declaration of State Highways, roads two-thirds financed by the State government through the Road Construction Authority (later VicRoads). Hyland Highway was declared a State Highway in December 1990,[3] from Traralgon to Yarram; before this declaration, the road was referred to as Traralgon Creek Road and Yarram-Traralgon Road.[3]
Hyland Highway was signed as State Route 188 between Traralgon and Yarram in 1990; with Victoria's conversion to the newer alphanumeric system in the late 1990s, it was replaced by route C482.
The passing of the Road Management Act 2004[10] granted the responsibility of overall management and development of Victoria's major arterial roads to VicRoads: in 2004, VicRoads re-declared the road as Hyland Highway (Arterial #6170), beginning at Princes Highway at Traralgon and ending at South Gippsland Highway in Yarram.[4]
^State Government of Victoria. "Road Management Act 2004"(PDF). Government of Victoria. Archived(PDF) from the original on 18 October 2021. Retrieved 19 October 2021.