There are very few technologies that are as old as transportation. As long as people have lived, transportation has been needed in civilization. From horses, camels, wagons, and sailboats to cars, trains, ships, and airplanes, the technology of our transportation has come a long way. However, in recent years, many new challenges have caused a shift in the way we design our technology. While it may seem that improvements in planes and cars in the last decade have been small compared to improvements in computers and communication, there are many company and research labs that are pushing for new technologies that both conserve energy and provide for the increasing population of urban areas.