Click here for download : Hand Book of transportation Engineering Transportation systems of regional and national extent are composed of networks of inter- connected facilities and services. It follows that nearly all transportation projects must be analyzed with due consideration for their position within a modal or intermodal network, and for their impacts on network performance. That is, the network context of a transpor- tation project is usually very important. Thus, it is appropriate to begin a volume on trans- portation engineering with a chapter on national transportation networks. The subject of national transportation networks may be approached from at least two different perspectives. One approach, common to most introductory transportation textbooks, describes the physical elements of the various transport modes and their classification into functional subsystems. A second approach focuses on the availability of national transpor- tation network d...
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