The Nuna4 solar car from the Dutch Nuon Solar Team tool top spot in the Panasonic World Solar Challenge in Australia, a 3,000-kilometer (1,870-mile) cross-continent, Darwin to Adelaide race. The Dutch team completed the race in 33 hours with an average speed of 90.87 km/h (56 mph).
The solar challenge, in its 20th Anniversary year, featured three classes of vehicles. Challenge Class solar cars had to be newly built for the 2007 event, and had to meet current requirements as set down by the International Solar Car Federation (ISCF). The Nuna4 car is a Challenge Class vehicle.
Adventure Class vehicles did not have to meet these current requirements, but had to meet previous versions of ISCF standards. The Adventure Class winner was the Tiga from the Ashiya University Solar Car Project in Japan, with a time of 32 hours, 03minutes. The Greenfleet Technology Class was a third class of participants and was a display fleet of energy-efficient vehicles and driving. Winner in the Greenfleet class was an Audi A3 Sportback 1.9e diesel, with fuel consumption of 3.3 l/100km (71 mpg US).