This paper analyzes collision and non-collision incidents that occurred on TriMet’s bus system over a near two-year period. The bus route network was decomposed into stop and line haul segments, and a typology of models was estimated from segment level incident, risk exposure, and roadway feature… Read More

The bulk of the bridge inventory in Oregon was built prior to the current understanding of bridge response and prior to current understanding of the expected earthquake demands. While some bridges are being replaced due to other deficiencies, majority are expected to continue to stay in service for… Read More

In 2010, the Baldock Restoration Group relocated 37 homeless households from the Baldock Rest Area near Wilsonville. Relocated residents included both situationally homeless households (e.g., someone who had lost his job in the recent recession) as well as the chronically homeless (e.g., someone… Read More

The Sydney Coordinated Adaptive Traffic System (SCATS) is used to mitigate traffic congestion along urban arterial corridors. Although there has been research on SCATS’ performance, this report combines three different areas of research about SCATS that are not known to be represented in any… Read More

The collapse of the I-35W Bridge in Minneapolis, Minnesota has raised questions regarding the performance and possibly safety of steel truss bridges. The failure investigation indicated that the collapse was due to a design error in the gusset plates used to connect the truss members. The findings… Read More

In some jurisdictions, protected left-turn phasing has been replaced with the flashing yellow arrow (FYA) for protected/permissive left turns (PPLTs) to reduce delay. However, it is important to have a thorough understanding of the conflict between pedestrians and the permissive left-turning… Read More

The Oregon Department of Transportation has implemented a travel time reporting system that utilizes wireless technology to estimate travel times along a five mile corridor of OR-99W in Tigard, Oregon. The system calculates the travel time by measuring the time for a vehicle equipped with a… Read More

As early as 1924, the need for safety-knowledge was recognized. At a national conference on street and highway safety it was reported that safety data “are so vital to any comprehensive understanding and treatment of the safety problem that their collection and analysis in every State and… Read More

This project sought to understand the relationship between urban form, transit service characteristics, and ridership measured at the stop level. Most previous work in this area has looked at these issues separately, by either linking system performance (e.g. on-time performance, cost, etc.) to… Read More

There is a growing interest in arterial system management due to the increasing amount of travel on arterials and a growing emphasis on multimodal transportation. The benefits of archiving arterial-related data are numerous. This research report describes our efforts to assemble and develop a… Read More

Due to recent budget and fiscal constraints, it is ever more imperative for transit agencies to manage their fleets in an optimal way. Fleet data have consistently shown that bus operational and maintenance (O&M) per-mile costs increase as buses age. From a purely economic perspective, there is a… Read More

The shift from combustion engines to low- and no-emission electric vehicles is underway and gaining momentum. During the last year, Oregon has become an active player in the electric vehicle arena, with a number of promising relationships and activities in the early stages of formalization. With… Read More