Le Corbusier harmonized and lent credence to the idea of space as a set of destinations between which mankind moved continuously. He gave credibility to the automobile as transporter, and to freeways in urban spaces. His philosophies were useful to urban real estate developers in the American post-World War II period because they justified and lent intellectual support to the desire to raze traditional urban space for high density, high profit urban concentration. The freeways connected this new urbanism to low density, low cost, highly profitable suburban locales available to be developed for middle class single-family housing.