Travel Equity in Dar es Salaam, Tanzania: Evidence from an Experimental Smartphone-Based Travel Survey

Dar es Salaam, like other large developing cities, faces numerous urban development challenges. Among these, individual mobility and its equity loom large. Yet, travel equity analysis is a challenge. Equity can be defined according to different theoretical principles. These can lead to differences in determining “what” should be distributed, “how” to distribute it, and, then, how to operationally measure it. This paper defines travel welfare as the observed accessible opportunities derived from individuals’ actual travel and uses data from a unique smartphone-based travel survey to operationalize space-time prism-based measures of travel welfare. A monthly measure is calculated based on the spatial distribution of the locations a traveller has visited over a month. A daily measure uses a road network-based calculation to measure the area that an individual can access between pairs of fixed locations given a single day’s constraints. Both measures suggest high travel inequity among participants in Dar. However, although accessibility is unequal (equality of welfare), it is the differences in willingness and ability to pay, rather than the differences in returns on travel welfare investment (equality of effectiveness), that lead to high inequity of travel welfare.

  • Supplemental Notes:
    • This paper was sponsored by TRB committee ADD50 Standing Committee on Environmental Justice in Transportation.
  • Authors:
    • Li, Menghan
    • Zegras, P Christopher
  • Conference:
  • Date: 2018


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Maps; References; Tables;
  • Pagination: 23p

Subject/Index Terms

Filing Info

  • Accession Number: 01663989
  • Record Type: Publication
  • Report/Paper Numbers: 18-06260
  • Files: TRIS, TRB, ATRI
  • Created Date: Jan 8 2018 11:37AM