17 Overview of Intelligent Transportation Systems
Mobility is essential to the economic growth of any modern country and the well- being of its population. This is especially
true for the United States because of its size and diffuse population. Without the efficient transport of people and goods,
U.S. industries cannot compete effectively with overseas producers. However, the rapid growth in demand and the slower growth
in the capacity of highway systems have led to congestion that is estimated to cost more than $40 billion annually. In 1970, motorists in the United States drove approximately 1 trillion vehicle-miles; by 1985, this had increased to 1.8 trillion vehicle-miles; and, by 2000, to 2.8 trillion vehicle-miles. These increases have ...