has been renamed as Old Bega Road. The western section has also seen some major changes with the highway being realigned to avoid Lake Eucumbene near Adaminaby due to the construction of Eucumbene Dam in the 1950s. Similarly realignment was required to avoid the Jounama Pondage and Blowering Reservoir near due to the construction of Jounama and Blowering Dams in the 1960s. 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, the eastern end of the highway was truncated to the intersection with Princes Highway at Stony Creek north of Bega on 24 May 1996; the former section from Bega to Tathra was renamed as Tathra Road. Snowy Mountains Highway today retains its declaration as Highway 4, from the intersection with Princes Highway at Stony Creek to the intersection with Monaro Highway south of Nimmitabel, and from Cooma to the intersection with Hume Highway near Hillas Creek in Mount Adrah. Route markers Route markers were first introduced in Australia in late 1954. Over the following decades they were progressively rolled out to the various highways around the nation, under a nationwide route numbering scheme, with the highway allocated National Route 18 across its entire length in 1955. In addition to this, the section of Monaro Highway between Cooma and Steeple Flat was also signed as National Route 18 in addition to the National Route 23 route marker used along the remainder of its length within NSW; this kind of arrangement is known as a duplex or concurrency. This allowed one route to cover the highway from end to end. With the conversion to the newer alphanumeric system in 2013, this was replaced with route B72. The concurrency along Monaro Highway remains intact with B72 used in addition to B23 between Cooma and Steeple Flat. Junction list See also Highways in Australia Highways in New South Wales References Highways in New South Wales