Friday Transportation Seminar: Reckoning with Induced Vehicle Travel

Friday, February 4, 2022, 11:30am to 12:30pm PST
Jamey Volker, UC Davis
PDH: 1 | AICP: 1

Friday Transportation Seminars at Portland State University have been a tradition since 2000. You can join us online at 11:30 AM. Stay tuned for an announcement of the fall term lineup.


Empirical research shows that expanding roadway capacity induces more driving - the so-called "induced travel" phenomenon. However, environmental impact assessments and cost-benefit analyses of roadway capacity expansion projects have historically ignored, underestimated, or mis-estimated this induced travel effect. As a result, they frequently overestimate the projects' potential to relieve congestion and reduce air pollution. That spurred our team at the National Center for Sustainable Transportation (UC Davis) to develop an online tool to facilitate estimation of induced vehicle travel from capacity expansion projects. This presentation will explain the induced travel phenomenon, introduce our induced travel calculator and its offshoots, and discuss how transportation impact analysis is changing.


The audience will hopefully walk away with an understanding of:

  • the induced travel phenomenon,
  • how the induced travel calculators work, and
  • how they are helping change transportation impact analysis.


Jamey Volker, University of California, Davis

Dr. Jamey Volker is a postdoctoral researcher with the National Center for Sustainable Transportation at UC Davis. He studies transportation policy, housing policy, and land use and environmental law.


This 60-minute seminar is eligible for 1 hour of professional development credit for AICP (see our provider summary). We can provide an electronic attendance certificate for other types of certification maintenance.


Photo by Sundry Photography/iStock

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The Transportation Research and Education Center (TREC) at Portland State University is home to the National Institute for Transportation and Communities (NITC), the Initiative for Bicycle and Pedestrian Innovation (IBPI), and other transportation programs. TREC produces research and tools for transportation decision makers, develops K-12 curriculum to expand the diversity and capacity of the workforce, and engages students and professionals through education.