TREC research addresses complex transportation problems by drawing on multiple disciplines, including engineering, planning, economics and design, from across the Portland State University campus. Use the search box at right to search for a specific project.
Research Highlights
Transportation Behavior Among Older Vietnamese Immigrants in the Dallas-Fort Worth Metroplex
Rebecca Mauldin Stephen Mattingly , Rupal Parekh
Nearly 4.6 million immigrants age 65 years and older live in the United States. This population is expected to more than triple in size by 2050. A lack of culturally appropriate transportation solutions for older immigrants and migrants (i.e., (im)migrants) creates disparities in access to services for older (im)migrant populations, increasing their risk of social isolation and reduced physical and mental health. Transportation disparities also have negative ripple effects to other sectors…
Read More
Multimodal Trip Generation, Vehicle Ownership and Use: Characterizing The Travel Patterns of Residents of Multifamily Housing
Kelly Clifton
Many cities are reconsidering their reliance on ITE’s Trip Generation Manual, now in its 10th edition. Kelly Clifton and co-investigator Kristina Currans of the University of Arizona examine the advantages and limitations of ITE’s land use taxonomy for multifamily residences. They find that the land use categories aiming to capture intensity of development for residential land uses (high-rise apartments, for example) do not appear to capture any more variation in the vehicle or person trip…
Read More

