91 RON unleaded petrol is the preferred fuel however 95 RON high octane unleaded fuel may also be specified. Seven ADRs relate to emissions and noise covering all categories of motor vehicles. Petrol engine emissions are aligned with US EPA 1990 requirements. Domestically produced and imported vehicles are treated equally. A number of congestion relieving initiatives have been introduced in Australian cities including bus only lanes, centrally controlled traffic light sequencing, urban freeways, etc.
Research is underway in a number of areas related to development of intelligent transport systems.