The results of updating a travel survey in the nine-county San Francisco Bay Area are reported. The trip-making characteristics from the 1965 home-interview survey are compared with those from the 1981 telephone survey. The comparison is complemented with work trip modal shares from 1960, 1970, and 1980 census journey-to-work data. The observed changes in travel habits are traced to changes in demographic and economic characteristics in the region. Household trip rates are summarized by trip purpose, mode of travel, household size, automobile ownership, income, and housing structure type. The significance of the changes in trip rates is assessed intuitively and verified by simple statistical tests. The comparative analysis indicates that the total household trip rates are stable over long periods of time. However, there are significant shifts in the frequency of trip making by trip purpose: Households make fewer home-based shopping and personal business trips and more non-home-based trips now relative to 1965. Although some trip rates by socieconomic stratifications are significantly different in the two surveys, the overall effect on aggregate regional rates are tempered by shifts in the distribution of households by socioeconomic stratifications. Regional transit shares for work trips were found to be on the decline between 1960 and 1970, and were constant between 1970 and 1980. For those urban counties where significant transit service improvement took place between 1970 and 1980, transit work trip shares increased significantly. Public transportation appears to be absorbing more of the nonwork trip market now relative to 1965.

Media Info

  • Media Type: Print
  • Features: References; Tables;
  • Pagination: pp 57-66
  • Monograph Title: Travel measurement issues
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00451165
  • Record Type: Publication
  • ISBN: 0309037719
  • Files: TRIS, TRB
  • Created Date: Nov 30 1985 12:00AM