The fourth round of the 2005–06 A1 Grand Prix season was held in Australia, and the field was again reduced to 24 nations following the withdrawal of A1 Team Indonesia due to driver Ananda Mikola's commitments to his Formula 3 Championship.

China's Tengyi Jiang suffered a 100 mph accident late in the session, causing it to be red-flagged, and leaving the Chinese team with a long night ahead of them to rebuild the car in time for qualifying.

Enrico Toccacelo returned to the Italian car to set the eighth quickest time, while China proved that their hard work overnight paid off, Tengyi coming in 20th.

Qualifying saw France take its second pole position of the season, and possibly setting itself up for an incredible fifth consecutive race victory.

Lapierre was unable to improve on either of his times on his third lap, and with Portugal setting a 1'18.582 to move to just 0.490 seconds behind on aggregate, France took the risk of waiting in the garage to see if they needed to defend their provisional pole.

Traditional rivals Australia and New Zealand will line up together on the seventh row of the grid, after Will Davison and Jonny Reid qualified 13th and 14th respectively at their teams' "home" race.

Remarkably, by the end of the third qualifying session, all 24 teams entered into the round had broken the previous Eastern Creek lap record.

As the race restarted, France held its lead over Portugal, Brazil, Ireland and Great Britain, with Switzerland in sixth spot after losing three positions off the line.

The racing restarted on lap 8, with The Netherlands (7th) and Switzerland (6th) locked in a fascinating battle, but the experience Jos Verstappen was unable to make his moves stick.

When the allocated 30 minutes were complete, the race was ended, France taking its fifth consecutive win in the series (and Lapierre's third) to increase its points gap back to Brazil.

Front-runners France and Great Britain both peeled off into the pits on lap 9, handing Lebanon the race lead, a remarkable occurrence given the team had not yet scored a point in A1GP.

Brazil, who already had wheel nut problems in their pitstop drop them down the field, were dealt a further blow when they were handed a penalty for an infringement on that stop.

Michael Devaney, sensing an opportunity to move out of 8th at the restart, accidentally passed the Portuguese car before the start-finish line, and incurred a 25-second penalty, which was added at the end of the race.

Japanese driver Hayanari Shimoda went off the circuit at turn one at very high speed, the car flipping several times before hitting a wall on the outside of the corner.

Ireland finished the race in 7th spot, but the 25-second penalty dropped the team out of the points to 14th, allowing New Zealand, Brazil and the US to add to their respective tallies.