This is one of a series of six reports describing simplified aids to improve transportation decisions without resorting to computers or extensive data collection. In this report, an analytical aid is described which provides a method for deriving and using the variable of automobile availability per household. This is an important socioeconomic variable in travel demand estimation. It is frequently not available, however, at the level desired, e.g., transportation planning zone, traffic zone, or census block, or for the current year at any level. In the course of the research in which this aid was developed, a strong correlation was found between auto availability per household and the product of two other variables: the average market price of homes and the percent of home ownership. Data for these two variables are generally more readily available at the block or zone level or may at least be forecast more precisely at this level than automobile availability. This report describes auto availability per household as a function of the product of the two variables. Estimates of automobile availability derived from this function can be applied to trip generation and modal split analysis in transit system studies, route patronage estimation, and sketch planning studies in urban areas of any size. Examples of trip generation and modal split applications of the variable are also presented in this report. It is pointed out in the report, that because of the intent to provide a simplified analysis aid, modifications, embellishments, and improvements to the suggested procedures and models are encouraged, provided local data or previous analyses suggest a more appropriate method. (UMTA)

  • Availability:
  • Corporate Authors:

    Peat, Marwick, Mitchell and Company

    1025 Connecticut Avenue, NW
    Washington, DC  United States  20036

    Urban Mass Transportation Administration

    400 7th Street, SW
    Washington, DC  United States  20590
  • Publication Date: 1979-1

Media Info

  • Pagination: 35 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00302258
  • Record Type: Publication
  • ISBN: .1.1 IT-06-9020
  • Report/Paper Numbers: UMTA-IT-06-9020-79-2Final Rpt.
  • Contract Numbers: DOT-UT-50021
  • Files: TRIS, USDOT
  • Created Date: Jan 30 1981 12:00AM