An Employer Panel for Evaluating the Effectiveness of Trip Reduction Incentives

  • Genevieve Giuliano
  • Martin Wachs
Part of the Transportation Research, Economics and Policy book series (TRES)


Three waves of data were collected on a panel of Southern California employment sites subject to the South Coast Air Quality Management District (SCAQMD) Regulation XV, in force from 1988–1995. This regulation required public and private employers with ≥ 100 employees at any work site to develop and implement a trip reduction plan to achieve specified ride-sharing goals. Regulation XV is the most ambitious and far-reaching mandatory trip reduction program ever implemented, providing a unique opportunity to determine if such programs can significantly alter travel behavior. In this chapter, we use data from our panel to explore the extent to which trip reduction targets were reached over time. We also assess the relative effectiveness of trip reduction incentives provided to employees, and the interplay between changes in the incentives and changes in commuting behavior.


Travel Behavior Plan Implementation Work Site Flexible Work Employee Benefit 
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Copyright information

© Springer Science+Business Media New York 1997

Authors and Affiliations

  • Genevieve Giuliano
    • 1
  • Martin Wachs
    • 2
    • 3
  1. 1.School of Urban Planning and DevelopmentUniversity of Southern CaliforniaLos AngelesUSA
  2. 2.University of California Transportation CenterBerkeleyUSA
  3. 3.Departments of City and Regional Planning and Civil EngineeringUniversity of CaliforniaBerkeleyUSA

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