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.

NOTE: If you're looking for projects from our partner campuses, use the NITC research search.

Research Highlights

Empirical Observation of the Impact of Traffic Oscillations on Freeway Safety

Christopher Monsere
Soyoung Ahn
Traffic oscillations are typical features of congested traffic flow that are characterized by recurring decelerations followed by accelerations (stop-and-go driving). The negative environmental impacts of these oscillations are widely accepted, but their impact on traffic safety has been debated. This report describes the impact of freeway traffic oscillations on traffic safety. This study employs a matched case-control design using high resolution traffic and crash data from a freeway segmen... Read More

Institutional and Technology Options for VMT Data and Fee Collection Centers

Anthony Rufolo
The objective of this report is an analysis of public vs. private data and fee collection centers for vehicle miles traveled (VMT) fees. This includes the identification and evaluation of issues that will affect the relative desirability of the two forms of ownership and operation. These issues include cost, enforcement, debt collection, flexibility, and public perception. There are a variety of issues that must be addressed in evaluating public or private provision of a government se... Read More