TREC’s broad research program addresses complex transportation problems by drawing on multiple disciplines, including engineering, planning, economics and design, from across the Portland State University campus. Browse the featured projects below or use the search box at right to search for a specific project. NOTE: If you're looking for projects from our partner campuses, use the NITC research search.

Research Highlights

Improving Trip Generation Methods for Livable Communities

Kelly Clifton
Nico Larco
Current trip generation factors and methods used by engineers across the country do not accurately estimate travel from types of development key to livable communities, such as mixed use and infill development, and focus on motorized modes. This project addresses that problem, building upon two prior efforts, one in Oregon and one in California. Data from these prior projects will be pooled, creating a combined sample of over 180 sites in a variety of urban contexts. We will use these pooled ... Read More

Impacts of a Vehicle Inspection and Trip Permit Program on Vehicle Operations and Equity

Jennifer Dill
Like most states, Oregon has a vehicle inspection program (VIP) to help meet air quality standards. Vehicles in the Portland and Rogue Valley areas must pass the test to get a certificate required to register the vehicle. Owners of vehicles that do not pass the test prior to their registration expiring can obtain a short-term "trip permit." Trip permits provide vehicle owners a legal way to drive their vehicles after failing an emissions test, but before making the repairs to pass the test an... Read More