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

Unsupervised Approach to Investigate Urban Traffic Crashes Based on Crash Unit, Crash Severity, and Manner of Collision

Farzin Maniei Stephen Mattingly
Both crash frequency analysis (CFA) and real-time crash prediction models (RTCPMs) typically divide a highway into segments with a constant length for data aggregation. Despite the significant impact of the segment length in several previous traffic safety studies, no standard approach exists for determining a recommended segment length for crash data aggregation. This research investigates the impact of fragment size (segment length) on traffic crash data aggregation and establishes a… Read More

Pedestrian and Transit Oriented Design

Keith Bartholomew
This course introduces the theoretical basis and design principles of compact urban development and will review local, national and international TOD’s for the urban design qualities that make a place walkable and encourage multi-modal transportation. From this review, specific TOD locations will be identified and targeted for more comprehensive on-site investigations. Students in the course will be sent out to different metropolitan areas with exemplary TODs to conduct interviews, collect… Read More