If there is one main characteristic of the modern world1 that makes our lives different from our grandparents’, it is probably speed. We are always on the move, and we don’t have much patience with slow systems of transportation. We want to get there, and we want to do it fast! Carmakers, airline owners, and the planners of mass transit systems2 all share a common goal3. They are all trying to provide us with faster and faster ways to reach our destinations.