Handbook of Transportation Engineering
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 databases and their use for engineering planning and operations studies. The
latter approach is emphasized in this chapter, with the aim of providing the reader with some
guidance on obtaining and using such networks. In describing these network databases,
however, some high-level descriptions of the physical networks are also provided.
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 databases and their use for engineering planning and operations studies. The
latter approach is emphasized in this chapter, with the aim of providing the reader with some
guidance on obtaining and using such networks. In describing these network databases,
however, some high-level descriptions of the physical networks are also provided.
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