Influence of vehicle occupancy on the valuation of car driver's travel time savings: identifying important behavioural segments

Studies that develop estimates of the value of travel time savings (VTTS) for car travel typically assume that the VTTS of the driver is the only relevant measure of the worth of time savings. Although there is a recognition that the presence of passengers may condition the driver's choice of route and VTTS, the evidence is somewhat limited on the impact that the number of passengers has on the driver's VTTS. This paper investigates the role that the passenger plays in the VTTS of the non-commuting car driver, finding that the overall mean VTTS varies across the number of passengers, declining as the number of passengers increases; however this is largely attributable to the decreasing mean VTTS for slowed down time in contrast to a flat mean free flow time. The implications on travel time benefits ignored (through simple averaging) in previous studies, especially toll-road studies, and hence the impact on infrastructure justification, is potentially profound, given the important role played by VTTS and its variation over the number of passengers.(a)


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  • Accession Number: 01043184
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, ATRI
  • Created Date: Mar 6 2007 8:26AM