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

Travel to Food: Transportation Barriers for the Food Insecure in Tampa Bay

Ann Joslin Kevin Salzer
In partnership with the Center for Urban Transportation Research (CUTR) at the University of South Florida (USF), the Transportation Innovation Group informed practical transportation solutions aimed at improved food access in Tampa Bay (Hillsborough, Pinellas and Pasco counties). The food pantry/bank sites that are part of Tampa Bay Network to End Hunger (TBNTEH) helped to gather data through a survey and interviews of food-related organizational leadership, staff and volunteers from each… Read More