Corrugated roads in the Outback can be a major problem for travellers. They can do damage to the suspension and wheels of cars that travel over them, resulting in flat tyres, breakdowns and costly repairs. There have been many theories about the causes of road corrugations. In many instances, road corrugations are inevitable, leading to the necessity for re-paving the roads every so often. This is often not seen as a wise investment for the area of the Outback, however, which gets so little traffic.

http://7reasons.org/2011/09/25/guest-post-7-reasons-why-cruising-is-better-than-flying