The cost of transportation in the United States approximates one-fifth of our gross national product. Furthermore, one of every six individuals is employed directly by transportation industries such as automobile production, traffic control, and highway construction. In a larger sense, virtually all jobs in modern society are dependent on some aspect of transportation; for example, regardless of occupation, almost all of us must travel to and from work. There are also many enterprises that are specifically dependent on transportation systems, such as drive-in banks, large suburban shopping malls, and motels along interstate highways. Thus, the figure of one in six people who are directly employed by the transportation industry underestimates the degree to which we depend on transportation in almost every facet of our lives.
KeywordsTransportation System Travel Mode Transportation Industry Highway Construction Large Sense
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