The article describes compact, a single computer program developed by the mathematical advisory unit of the department of the environment to carry out the network building,trip distribution,modal split and assignment phases of a transportation model. The function of transportation models in forecasting travel demand is described with particular reference to the two main inputs: planning variables and transport vehicle descriptions, and the structure is illustrated by means of a block diagram. The speed and low cost of compact is obtained by forcing users to adopt a coarse zoning system. The model is for two types of travel-car and public transport,and two types of person-car owners and non-car owners. Restrictions on the size of study when compact is used on a cdc 3300 computer are number of zones 98, nodes (including zone centroids) 135, links in each network 540, journey purposes per run 6. Most likely applications would be in small town studies, in structure plans, initial sifting of broad strategies, and as a training tool. The larger cdc 6600 version is being used for testing of land- use alternatives with 87 zones, 200 nodes and 600 links. Both are available to local authorities and others interested but it is pointed out that advice cannot be given on the use and interpretation of program. Versions of compact exist for the cd 6600, icl 1900 series, ibm 360 series and univac computers.

  • Corporate Authors:

    Institution of Municipal Engineers

    25 Eccleston Square
    London SW1 V1NX,   England 
  • Authors:
    • MacKinder, I H
  • Publication Date: 1973-8


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00291007
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 5 1981 12:00AM