Australia possesses one of the best-developed economies in the world and as such the growing numbers of investments in the country are drawing visitors by the dozen. This has in turn given rise to severe rise in population in the metropolitan cities of Australia, and subsequently to the traffic overload on the roads that run through these cities. Thus, of late the Australian government has taken the initiative of building road tunnels which will reduce traffic congestion in metropolitan cities. Most of these latest additions to Australian roadways are tunnels that run underwater and have proved to be engineering marvels. Some of these road tunnels in Australia are; the Burnley tunnel, the Graham Farmer Freeway, the Domain tunnel, the Canning tunnel, the Ardglen tunnel, Eastern Distributor, the Heysen tunnels, Lane Cove tunnel, M5 south western motorway, the swan view tunnel, Wungong tunnel and the Sydney Harbor tunnel.
Tourists to Australia can avail various options in order to travel to various destinations across Australia; some such options include renting vehicles which is undoubtedly the best traveling option in the country. Rental vehicles are available at different prices and can take tourists for a guided tour to various destinations across Australia. There are numerous international rental companies situated within Australia and offer best quality cars to tourists. Apart from this, tourists may also opt to buy a car or campervan if they wish to prolong their stay for a few weeks within the country. Various automobile clubs spread across Australia help tourists to locate authentic car hiring companies, but in all cases a valid driver's license is a must. Other than these tour buses and coaches are also good options which can help one explore the scenic beauty of Australia. However, it is always advisable to gather information about the regular road conditions within the country. Although most Australian roads are very well maintained, there are some unsealed roads in northern Australia which become unreachable during the rains because the nearby rivers can make the roads easily flooded.