Roads in Australia's major cities are becoming increasingly congested. The latest ABS data shows that between 2001 and 2005, the number of registered motor vehicles grew by 17 per cent in Queensland, 12 per cent in New South Wales and 10 per cent in Victoria. This growth in motor vehicles in starting to cost us, with a report by the Centre for International Economics showing that in Sydney, reliance on motor cars is costing $18 billion per year in congestion, accidents and air pollution.