Share Read on Mobile Enter Reading Mode Australia’s Highway 1 is the world’s longest national highway… Posted on September 18, 2016 by Web Desk General Knowledge Australia’s Highway 1 is the world’s longest national highway. With about 14,500 km, (9,000 mi), it circumnavigates the entire country. (Visited 41 times, 1 visits today) SCAN THIS QR CODE WITH YOUR PHONE