The motors used in solar cars typically generate about 2 or 3 horsepower, yet experimental light solar cars may attain the same speed as a typical family car (). Races Two solar car races are the World Solar Challenge and the American Solar Challenge, overland road rally-style competitions contested by a variety of university and corporate teams. The World Solar Challenge features a field of competitors from around the world who race to cross the Australian continent, over a distance of . Speeds of the vehicles have steadily increased. For example, the high speeds of 2005 race participants led to the rules being changed for solar cars starting in the 2007 race and 2014 also. The American Solar Challenge, previously known as the 'North American Solar Challenge' and 'Sunrayce USA', features mostly collegiate teams racing in timed intervals in the United States and Canada. This race also changed rules for the most recent race due to teams reaching the regulated speed limits. The most recent American Solar Challenge took place from July 6 to 22, 2018, from Omaha, Nebraska, to Bend, Oregon. The Dell-Winston School Solar Car Challenge is an annual solar-powered car race for high school students. The event attracts teams from around the world, but mostly from American high schools. The race was first held in 1995. Each event is the end product of a two-year education cycle launched by the Winston Solar Car Team. In odd-numbered years, the race is a road course that starts at the Dell Diamond in Round Rock, Texas; the end of the course varies from year to year. In even-numbered years, the race is a track race around the Texas Motor Speedway. Dell has sponsored the event since 2002. The South African Solar Challenge is a bi-annual two-week race of solar-powered cars through the length and breadth of South Africa. Teams will have to build their own cars, design their own engineering systems and race those same machines through the most demanding terrain that solar cars have ever seen. The 2008 race proved that this event can attract the interest of the public, and that it has the necessary international backing from the FIA. Late in September, all entrants will take off from Pretoria and make their way to Cape Town via the N1, then drive along the coast to Durban, before climbing the escarpment on their way back to the finish