in General Knowledge Australia’s Highway 1 is the world’s longest national highway… by Web Desk September 18, 2016, 5:27 am 66 Views Australia’s Highway 1 is the world’s longest national highway. With about 14,500 km, (9,000 mi), it circumnavigates the entire country. Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website By using this form you agree with the storage and handling of your data by this website. *