Transportation-related activities represent approximately 20% of gross national product of United States; urban sprawl characterizing recent development of our cities has resulted largely from development of highly efficient highway transportation system; rail systems have been developed to high degree and, recently, new attention has been directed to this mode; air transport has evolved from struggling fledgling to major industry; nonetheless, highway, rail, and air transportation are all facing difficult problems; some of major areas of activity relating to each of these modes are reviewed.
Status of transportation
IEEE -- Proc
1968
IEEE Proceedings ; 56 , n 4
1968
11 pages
Conference paper
English
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