Road number [ 1] Road name Route Date of original gazettal Distance Notes HW1 Princes Highway Sydney to Victoria border via Wollongong 1920 1,898 km (1,179 mi) HW2 Hume Highway (includes Hume Motorway) Sydney to Victoria border via Goulburn , Gundagai , Albury 1817 840 km (520 mi) HW3 Federal Highway Hume Highway to Australian Capital Territory border 1931 72.7 km (45.2 mi) HW4 Snowy Mountains Highway Princes Highway to Hume Highway via Cooma 1933 287 km (178 mi) Named as Monaro Highway until 1955 [ 2] HW5 Great Western Highway Sydney to Bathurst 201 km (125 mi) HW6 Mid-Western Highway Bathurst to Hay 1928 522 km (324 mi) HW7 Mitchell Highway Bathurst to Queensland border via Dubbo 1,105 km (687 mi) HW8 Barrier Highway Nyngan to South Australia border 1,014 km (630 mi) HW9 New England Highway Pacific Highway to Queensland border via Tamworth 883 km (549 mi) HW10 Pacific Highway Sydney to Queensland border via Newcastle and Coffs Harbour 780 km (480 mi) HW11 Oxley Highway Pacific Highway to Mitchell Highway via Tamworth 653 km (406 mi) HW12 Gwydir Highway Pacific Highway to Castlereagh Highway via Moree 1928 568 km (353 mi) HW13 Cumberland Highway Liverpool to Wahroonga 1988 34 km (21 mi) HW14 Sturt Highway Hume Highway to South Australia border via Wagga Wagga 8 August 1933 [ 3] 947 km (588 mi) HW15 Barton Highway Yass to Australian Capital Territory border 1935 52 km (32 mi) HW16 Bruxner Highway Pacific Highway to Newell Highway via Lismore 1959 420 km (260 mi) HW17 Newell Highway Victoria border to Queensland border via Narrandera and Dubbo March 1938 1,058 km (657 mi) HW18 Castlereagh Highway Lithgow to Queensland border via Mudgee 1974 790 km (490 mi) HW19 Monaro Highway Australian Capital Territory border to Victoria border via Cooma 25 March 1938 [ 4] 285 km (177 mi) [ 5] HW20 Riverina Highway Deniliquin to Victoria border 220 km (140 mi) HW21 Cobb Highway Wilcannia to Victoria border 571 km (355 mi) HW22 Silver City Highway Sturt Highway to Queensland border via Broken Hill 683 km (424 mi) HW23 Unnamed (Newcastle Inner City Bypass ) Windale to Sandgate 15.6 km (9.7 mi) HW24 Mount Lindesay Highway Tenterfield to Queensland border via Woodenbong Decommissioned 12 February 1982[ citation needed ] HW25 Illawarra Highway Hume Highway to Princes Highway via Moss Vale 60.7 km (37.7 mi) HW26 Calga to Ourimbah Expressway[ citation needed ] Decommissioned after completion of parallel section of Pacific Motorway in 1986[ citation needed ] HW27 Golden Highway New England Highway to Newell Highway via Dunedoo 313 km (194 mi) HW28 Carnarvon Highway Moree to Queensland border 1974 698 km (434 mi) HW29 Kamilaroi Highway Bourke to New England Highway 605 km (376 mi) HW30 Central Coast Highway Pacific Motorway to Pacific Highway via Gosford 9 August 2006 50 km (31 mi) HW31 Gold Coast Highway Pacific Motorway to Queensland border 1 May 2009 [ 6] 39.8 km (24.7 mi) Decommissioned