In November 1976, the alignment was changed so as not to pass through Delegate any longer. The highway now connected to what was then the Cann Valley Highway in Victoria. The former alignment was classified as Main Road 93 and is now known as Delegate Road for most of its length. The State Highway terminology is no longer used, and as such the Monaro Highway is currently classified as Highway 19 (or HW19) by Roads and Maritime Services. In 1958 Federal government agreed to apply the Monaro Highway name to Cooma-Canberra road within the ACT. This gave the roadway a single name between Canberra and the Victorian border. Originally, the highway ended where it met Jerrabomberra Avenue. Plans were publicised during the mid-1980s for an upgrade of the existing Monaro Highway to dual-carriageway standard between Isabella Drive and Jerrabomberra Avenue, and an extension of the roadway to the north. These works were known as the Eastern Parkway. These plans were then given the go ahead in a report tabled on 5 May 1987, the estimated costs were $50 million including upgrades to other nearby roadways. Around the same time period a large service centre was proposed for near the Isabella Drive intersection, though it was quite controversial, and the developer pulled out. Between 1988 and November 1989 the duplication was completed, and the roadway extended as far as Canberra Avenue. After this the road was extended to its current terminus at Morshead Drive, although the northbound carriageway was originally routed over Dairy Flat Road until a southbound carriageway was constructed later on. Further duplication was performed to other sections of the extension until all sections were completed in mid-2012. The northern end of the Monaro Highway now connects to the southern end of the Majura Parkway following the latters completion in 2016. Territory and Municipal Services has classified the Monaro Highway as an arterial road within the ACT Road Hierarchy. 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. The highway originally carried the National Route 23 route marker. Although after the construction of the Eastern Parkway extension, the highway north of Canberra Avenue was signed with the Alternate National Route 23 route marker. The section of the Monaro Highway between Steeple Flat and Cooma was also signed the National Route 18 shield in addition to the National Route 23 route marker used along the remainder of its length; this arrangement is known as a "duplex" or "concurrency".