The Capricorn Highway is located in Central Queensland, Australia, and links the city of Rockhampton with western Queensland. The highway is long, and joins the Landsborough Highway at Barcaldine. Formerly National Route 66, Queensland began to convert to the alphanumeric system much of Australia had adopted in the early-2000s and is now designated as A4. The highway runs parallel with the Tropic of Capricorn, hence its name. Other towns situated along the highway include (from east to west): Gracemere, Kabra, Stanwell, Westwood, Gogango, Duaringa, Dingo, Bluff, Blackwater, Comet, Emerald, Bogantungan, Alpha and Jericho. Running virtually east/west, the highway traverses the area known as the Central Highlands, and crosses the Great Dividing Range between Alpha and Jericho. Northern Australia Roads Program upgrade The Northern Australia Roads Program announced in 2016 included the following project for the Capricorn Highway. Highway duplication The project to duplicate the section between Rockhampton and Gracemere was completed in mid 2021 at a total cost of $75 million. This will facilitate the construction of the south-western entry to the proposed Rockhampton Ring Road. Northern Australian Beef Roads Upgrade The Northern Australia Beef Roads Program announced in 2016 included the following project: Road train access to Rockhampton (stage 2) The project for upgrading between Gracemere saleyards and the Rockhampton abattoirs to provide access for Type 1 Road Trains was completed by early 2021 at a total cost of $30 million. It involved about of road improvements on four roads: Capricorn Highway - from Saleyards Road at Gracemere to the Bruce Highway roundabout at Rochhampton (). Bruce Highway - from the Capricorn Highway roundabout to the Yaamba Road intersection (). Rockhampton-Yeppoon Road - from the Bruce Highway intersection south-west to the Emu Park Road intersection (. Rockhampton-Emu Park Road - from the Rockhampton-Yeppoon Road intersection to St Christophers Chapel Road at (). Roads of strategic importance upgrades The Roads of Strategic Importance initiative, last updated in March 2022, included the following projects for the Capricorn Highway. Corridor upgrade A lead project to upgrade the Mount Isa to Rockhampton corridor, including sections of the Capricorn and Landsborough Highways and surrounding state and council roads, at an estimated cost of $237.5 million, was in the planning and scoping stage. Works are expected to include progressive sealing, lane duplications and crossing upgrades. Intersection upgrade Gregory Highway A project to upgrade the intersection with the Gregory Highway in at a cost of $7.9