One view of the transportation system of the nation is that it consists of a large number of individual city-pair markets. The markets are different sizes, are located different distances from each other, and are served by a variety of transportation services. By summing the transportation activities found in each of these city-pair markets, the overall transportation system of the nation can be described. This approach ignores the complexity of the transport network and alternate paths through it on purpose. A major reason for focusing on city-pair markets rather than on the multi-modal network which makes up the overall system is that individual markets, with their hinterlands are easier to understand and to work with. Obviously, identifying those links which function as the connecting tissue, and disentangling them from the larger network poses problems but it is relatively straight forward. The result is an abstract representation of the city-pair markets connected by single links of the various modes. This approach does not completely ignore the complexity of travel over the networks. It merely focuses attention in the first instance on those attributes of travel between the cities which are important to the carriers which offer service in the market and to those shippers and receivers who seek it. (ERA citation 03:048234)

  • Corporate Authors:

    Massachusetts Institute of Technology

    Center for Transportation Studies, Room 1121
    Cambridge, MA  United States  02139

    Department of Energy

    1000 Independence Avenue, SW
    Washington, DC  United States  20585
  • Authors:
    • Roberts, P O
  • Publication Date: 1975-10

Media Info

  • Pagination: 33 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00186402
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Files: TRIS
  • Created Date: Feb 27 1982 12:00AM