Alex Bigazzi, a 2014 NITC dissertation fellow and graduate of Portland State University's Civil and Environmental Engineering Ph.D. program, has published a paper based on his NITC-funded research in Environmental Science & Technology, a journal of the American Chemical Society (ACS).
See ACS coverage of the project here.
Bigazzi's research evaluates the concentration of air pollution encountered by cyclists in Portland, Oregon.
In the study, volunteer research subjects rode bicycles equipped with instruments to collect high-resolution bicycle, rider, traffic and environmental data.
Participants rode a variety of routes including bicycle lanes on primary and secondary arterials, bicycle boulevards, off-street paths and mixed-use roadways. They were told to ride at a pace and exertion level typical for utilitarian travel, and breath biomarkers were used to record the amount of traffic-related pollution present in each cyclist’s exhalations.
This research was the focus of Bigazzi's dissertation, Bicyclists’ Uptake of Traffic-Related Air Pollution: Effects of the Urban Transportation System, published by NITC in December 2014. It was related to an earlier project...Read more
The overall goal of this research was to quantify the safety performance of alternative traffic control strategies to mitigate right-turning-vehicle/bicycle collisions, often called "right-hook" crashes, at signalized intersections in Oregon.
A two stage experiment was developed in the OSU high-fidelity driving simulator to investigate the causal factors of right-hook crashes at signalized intersections with a striped bike lane and no right-turn lane, and to then identify and evaluate alternative design treatments that could mitigate the occurrence of right-hook crashes.
Experiment 1 investigated motorist and environmental related causal factors of right-hook crashes, using three different motorist performance measures:
- visual attention,
- situational awareness (SA) and
- crash avoidance behavior.
Data was collected from 51 participants (30 male and 21 female) turning right 820 times in 21 different experimental scenarios. It was determined that the worst case right-hook scenario occurred when a bicycle was approaching the intersection at a higher speed (16 mph) and positioned in the blind zone of the motorist. In crash and near crash situations (measured by time-to-collision...Read more
In 2015, 5th grade classes at Beaverton’s Chehalem Elementary and 5th and 6th graders at Tobias Elementary in Aloha took part in a NITC education project, Investigations in Transportation, co-sponsored by Portland State University, the Portland Metro STEM Partnership and the Oregon Department of Transportation. The students' work yielded functional changes which will likely be made to the parking lots at both schools, resulting in better traffic flow and increased capacity. The unit was designed to teach students real-world applications of core concepts in STEM (science, technology, engineering and mathematics). After exploring several potential engineering challenges at their schools, both groups of students chose to work on the “Parking Lot Dilemma.” Read the full story below.
Two Oregon elementary schools recently had their parking lots redesigned by the students.
5th grade classes at Beaverton’s Chehalem Elementary and 5th and 6th graders at Tobias Elementary in Aloha took part in a NITC education project, Investigations in Transportation, co-sponsored by Portland State University, the Portland Metro STEM Partnership and the Oregon Department of Transportation.
The students' work yielded functional changes which will likely be made to the parking lots at both schools, resulting in better...Read more
In this seminar, Dr. Porter will explore the interactions of geometric design decisions, speed, and safety. A performance-based approach to this topic will be considered given the availability of several key documents, including the Highway Safety Manual and TRB's Modeling Operating Speed: Synthesis Report as well as a significant body of published research. A historical look at the design speed concept will show that while the design speed definition has changed on more than one occasion, the same basic but flawed philosophy that relates design speed to a “safe speed” is still reflected in supplemental guidance related to design speed selection in current design policy. A conservative approach to establishing design criteria, currently used to address the range of driver, vehicle, and roadway conditions and capabilities that a designer must consider, will be demonstrated. Resulting operating speeds will be shown to be higher than design speeds for design speeds of approximately 55 mph or less. This outcome may be considered undesirable from a safety perspective, but that categorization seems to be based more on...Read more
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