Commercial vehicle movements associated with the delivery of goods and services are currently experiencing a number of challenging problems. Carriers and fleet operations face congestion, a growing number of tolls, increasing service level demands, and in some cases opposition due to the… Read More

This research seeks to understand the characteristics of transitions as freeway traffic changes from one state to another. This study addresses the features of two types of transitions; transitions near a merge and transitions along shock waves during the onsets and dissipations of queues at… Read More

A System-Wide Adaptive Ramp Metering (SWARM) system has been implemented in the Portland, Oregon metropolitan area, replacing the previous pre-timed ramp-metering system that had been in operation since 1981. SWARM has been deployed on six major corridors and operates during the morning and… Read More

Transportation of food accounts for a significant fraction of the carbon dioxide emissions believed to be adversely impacting climate and the environment. And this impact is increasing as food supply chains become longer and more complex, and food packaging requirements lead to increased waste… Read More

The U.S. highway transportation network relies on the health and integrity of major infrastructure elements such as bridges. Frequently traveled parts of Oregon are within the seismically active Pacific Northwest, and many of the bridges were designed and built to lateral demands that were assumed… Read More

Most transportation agencies rely on point detectors (e.g., inductive loops, axle detectors) located at specific points on highways to collect data on traffic volumes, vehicle classes, and other relevant attributes of traffic. By utilizing the data collected from these point detectors, researchers… Read More

This report describes the preliminary work to develop the Oregon Traffic Safety Data Archive (OrTSDA). The mission of OrTSDA is to “build the knowledge base of traffic safety data in Oregon.” It is hoped the archive will become a valuable traffic safety data resource with researchers, practitioners… Read More

As truck loads continue to get bigger, the demand on many aging bridges increases. Slender steel structural elements widely used in bridge superstructures and braced substructures to resist these loads are built primarily for tension, however, and can buckle under compressive loads. Portland… Read More

Objective The Oregon Department of Transportation conducted a test of an innovative technology to replace fuel taxes with mileage fees. In the test, some vehicles were charged a flat fee per mile and others were charged differential fees that were higher for travel in the Portland metropolitan… Read More

The purpose of this report is to identify current practices and challenges with collision diagramming at ODOT’s Crash Analysis and Reporting (CAR) Unit, research available tools, and to recommend a collision diagramming tool for implementation. Read More

With rates of obesity, heart disease, and related health problems increasing in the U.S., health professionals, planners, and policy makers are looking for ways to increase physical activity through changing urban form. While much of the focus is on walking, bicycling offers many benefits and… Read More

In June 2003 Oregon Driver and Motor Vehicle Services (DMV) implemented a new mandatory medical reporting requirement as required by ORS 807.710, in which some Oregon physicians and health care providers are mandated to report to DMV patients with certain severe and uncontrollable cognitive and… Read More