SUCCESSIVE OVERLAYS - A SMALL CITY TRANSIT SURVEYING PROCESS

A study was conducted in the city of Paducah, Kentucky, to estimate its transit potential. The first aim in the program was quantification of demand, which was achieved by means of a postal card survey. In order to define on a map those areas with a significant propensity for using transit, the technique of "successive overlays" was used. The first step was to evaluate the socio-economic characteristics of an area which would indicate ridership potential. The indices chosen were: 1) the number of passenger cars per dwelling unit; 2) average income; 3) females from 16 to 24 years: 4) persons over 62 years; and 4) dwelling units per acre. The best single indicator of transit patronage was found to be the number of passenger cars per dwelling units. Average income was also a good indicator, especially in combination with vehicle ownership. Each index was recorded on a transparent map and when these were superimposed on the area map, the shaded portions indicated the areas with the greatest transit potential. The postal card questionnaire was then sent to residents of these areas. After the data from this survey was analyzed, it was compared with the overlay data, and was found to correlate quite well. The overlay data tended to overestimate transit potential in some areas. In addition to this method being a valuable tool for small city planners, it is also a relatively low-cost survey.

  • Corporate Authors:

    Institute of Traffic Engineers

    2029 K Street, NW
    Washington, DC    20006
  • Authors:
    • Corradin, J C
    • Coomer, B D
    • Upshaw, W S
  • Publication Date: 1974-12

Media Info

  • Features: Figures;
  • Pagination: 5 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00084709
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 2 1982 12:00AM