ESTIMATING TRIP FREQUENCY FROM TIME BUDGET DATA

A nationwide time budget study was carried out in Finland in 1979. Around 6000 persons reported their activities, by keeping diary for two consecutive days. Respondents were asked to report travelling as a separate activity. This paper contains an analysis of the trip records found in the activity diaries. Earlier research in this field indicates that the data collection method has a significant effect on trip frequency and travel time estimates. This hypothesis is strongly supported by the results of the present analysis. A comparison between this study and a conventional travel diary survey exposes substantial differences with respect to overall trip frequency, modal split and distribution by trip purpose. The estimated average daily trip rates are about 60% higher in the activity data than in the travel diary data. The "new" trips caught in the activity diaries shift the modal distribution towards walking and cycling and the purpose distribution towards shopping and discretionary purposes. It also turns out that under-reporting in conventional studies varies with age group. The analysed trip data consists of two "types" of trips, namely reported trips and reconstructed trips. The possibility to reconstruct trips, which are not reported by the respondents is an interesting feature of activity data. From a methodological point of view the results of this study indicate that serious attention must be paid to data collection in transport surveys. The activity diary offers an alternative, but a very expensive one. The most important policy implications of the results are that the budget appropriations for pedestrian and cycling paths should be reconsidered. (TRRL)

  • Supplemental Notes:
    • Transport Planning Methods. Proceedings of Seminar N held at the PTRC Summer Annual Meeting, University of Sussex, England, 4-7 July 1983.
  • Corporate Authors:

    PTRC Education and Research Services Limited

    110 Strand
    London WC2,   England 
  • Authors:
    • TIGERSTEDT, R
    • KAARTAMA, M
  • Conference:
  • Publication Date: 1983

Media Info

  • Features: References; Tables;
  • Pagination: p. 3-13

Subject/Index Terms

Filing Info

  • Accession Number: 00382843
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Report/Paper Numbers: Volume P243
  • Files: ITRD, TRIS
  • Created Date: Apr 30 1984 12:00AM