Dr. Huajie Yang, who graduated in 2020 with a PhD in Urban Studies and Planning from Portland State University, devoted his doctoral research to studying the impacts of light rail transit. His dissertation, "Short-term and Long-term Effects of New Light Rail Transit Service on Transit Ridership and Traffic Congestion at Two Geographical Levels," quantitatively examines the effect of new Light Rail Transit (LRT) services on transit ridership and traffic congestion over time.
Connect with Huajie Yang on LinkedIn
Yang examined light rail's impacts at two different geographic levels. At the corridor level, he conducted case studies of two light rail lines in the Portland, Oregon region (TriMet's Green and Orange MAX lines). At the regional level, he used a synthetic control method to construct a control Urbanized Area that closely approximates the counterfactual transit ridership and traffic congestion scenario - in the absence of light rail projects - in three urbanized areas across America.
The results of the corridor-level study suggest that both the Green and Orange lines increased transit ridership in the short and long term, and relieved traffic congestion in the short term, while having no...
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Portland State University TREC researchers Kelly Clifton, Kristin Tufte and John MacArthur are among the co-authors of a May 2021 article published in Harvard Data Science Review. The paper, "Urban Sustainability Observatories: Leveraging Urban Experimentation for Sustainability Science and Policy," offers an outline of the requirements and research challenges involved in designing effective policies to meet sustainability goals for cities.
Humanity is experiencing revolutionary changes in the 21st century, including accelerating urbanization, the introduction of disruptive mobility technology services, and new sources of data generated and consumed by urban and mobility processes. However, the environmental, social, and economic sustainability implications of these new mobility services are unclear given the complex nature of urban systems and the multifaceted, contested nature of sustainability goals. The article discusses the concept of urban sustainability observatories that leverage urban experimentation through ongoing data collection and analysis capabilities. The researchers also discuss challenges in building and sustaining...
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We're proud to announce the publication of a new NITC dissertation: "Methodologies to Quantify Transit Performance Metrics at the System-Level," by Travis Glick of Portland State University.
Performance metrics have typically focused at two main scales: a microscopic scale that focuses on specific locations, time-periods, and trips; and, a macroscopic scale that averages metrics over longer times, entire routes, and networks. When applied to entire transit systems, microscopic methodologies often have computational limitations while macroscopic methodologies ascribe artificial uniformity to non-uniform analysis areas. These limitations highlight the need for a middle approach. This dissertation presents a mesoscopic analysis based around timepoint-segments, which are a novel application of an existing system for many transit agencies.
In the United States, fix-route transit is typically defined by a small subset of bus stops along each route, called timepoints. For this research, routes are divided into a consecutive group of bus stops with one timepoint at the center. Each timepoint-segment includes all data collected in that segment during one hour of operation. Visuals for congestion and headway performance, based on the aggregated datasets, are designed to...
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Our multi-year study on automated transit fare collection offers a key finding that won't surprise you: Despite the convenience, the rush toward cashless fare systems has created barriers for lower-income riders seeking to use transit. Results from focus groups, surveys, and a review of current transit agency practices suggest that continuing to accept cash is a crucial way to keep transit accessible. However, dealing with cash has drawbacks: it’s time intensive and expensive. Using a detailed cost-benefit model, the researchers explored the costs for agencies to maintain some cash options and found that some simple approaches can be quite effective. The best bang for the buck? Cash collection on board buses.
Launched in 2019, the research project "Applying an Equity Lens to Automated Payment Solutions for Public Transportation" was supported by a Pooled Fund grant program from the National Institute for Transportation and Communities (NITC) and conducted at three universities: Portland State University (PSU), the University of Oregon (UO), and the University of Tennessee, Knoxville (UTK). The other funding partners were City of Eugene, OR, City of Gresham, OR, Lane Transit District, Clevor Consulting Group, and RTD (Regional Transportation District) Denver....
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Last month, Portland State University announced the 2021 awards for faculty and staff excellence for research, graduate mentoring and research administration. The awards are among the university's highest honors. The 2021 Presidential Career Research Award recipient is Jennifer Dill. Dill is a professor in the Nohad A. Toulan School of Urban Studies and Planning, Director of the Transportation Research & Education Center at PSU, and Director of the National Institute for Transportation and Communities, a national university transportation center funded by the U.S. Department of Transportation.
TREC Communications Director Cait McCusker interviewed Dr. Dill last week to learn more about the origin and trajectory of her career in transportation research at PSU.
What led you to choose transportation research as your career?
Growing up in the 1970’s, I was surrounded by environmental issues. It was the time of the Clean Air Act, Clean Water Act, the EPA, Earth Day, pollution, the oil crisis...all of that shaping my view on the world. When I went to undergraduate at UC Davis I knew I wanted to do something related to environmental policy and cities. Cities held a certain fascination for me, and in college I started...
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This story is adapted from two sources; a story published by the Center for Transportation Studies and one from a 2007 Oregon Transportation Research and Education Consortium (OTREC) newsletter.
Transportation research and education has had a long, rich history at Portland State University. Looking back on that history, TREC is celebrating the achievements of an early advocate for transportation studies on the PSU campus: Dr. Walter H. Kramer.
PSU is a national leader in transportation studies and research, with TREC - the Transportation Research and Education Center - serving as the interdisciplinary hub connecting urban planning, civil engineering, and other disciplines to mobility. We take full advantage of our university's location in one of the most innovative transportation networks in the U.S. – Portland, Oregon. Since 2005 we have also led a collaborative, federally-funded UTC research program dedicated to improving the mobility of people and goods. But before TREC existed, transportation had another home at PSU: the Center for Transportation Studies, or CTS.
Dr. Kramer joined PSU...
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The Oregon Department of Transportation (ODOT) is a department of the state government of the U.S. state of Oregon responsible for systems of transportation. It was first established in 1969 and has a passionate, talented, diverse workforce of almost 5,000. This story was originally shared in ODOT'S February 2021 Oregon Toll Program newsletter.
Francisco Ibarra, a Toll Program planning intern, is currently attending Portland State University for his Master of Urban and Regional Planning (MURP) degree. Francisco is from East Portland and has lived in Gresham for most of his life. Francisco knows the importance of collaborative planning with community members.
As a research assistant to the Toll Program Equity and Mobility Advisory Committee [at ODOT], Francisco attends meetings, listens to questions, and follows up with researched answers. Recently, he completed research on air quality monitoring related to transportation and health. He is ready to provide help to support the Toll Program and committee in every way he can.
Read more"This project is...
With the extension of the FAST Act, the National Institute for Transportation and Communities (NITC) will be receiving one additional year of funding. NITC's Executive Committee has developed four new funding opportunities that build on the excellent work NITC researchers have accomplished and increase the impact we are having nationally on improving mobility to build stronger communities. With this funding, we aim to increase our efforts in integrating racial equity into transportation education and research. Given that our grant will be ending, these opportunities all emphasize projects that are relatively short in length, rely on existing expertise, and will have specific outputs and outcomes– rather than projects that would be the start of longer-term, multi-phase efforts.
We encourage faculty and researchers to review all of the opportunities available and decide which to pursue. Review the new NITC grant funding opportunities here.
We will host two webinars on May 17 and 25 (11 am to 12 pm PST) to discuss all of the opportunities and answer questions. Recordings will be available afterwards.
- Register for May 17: NITC 2021 Grant Opportunities (webinar #1)
- Register for May 25: ...
Congratulations to Avinash Unnikrishnan of Portland State University's Department of Civil and Environmental Engineering, for his 2021 promotion from associate professor to full professor!
Avi is a David Wedge Vision Professor of Civil and Environmental Engineering at the Maseeh College of Engineering & Computer Science at Portland State University. Dr. Unnikrishnan's research focuses on enhancing system efficiency and resiliency via the development of novel mathematical models based on the application of large-scale optimization, machine learning, data mining, and simulation tools. His work's primary innovation is in the representation of network uncertainty, robustness, user behavior, and complex system interaction in civil infrastructure networks. Dr. Unnikrishnan is the chair of the Transit, Freight, and Logistics Subcommittee (AEP40(1)) of the Transportation Network Modeling Committee of the Transportation Research Board. He is also a member of the Freight and Logistics Committee of the American Society of Civil Engineers.
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See the full, original article "PSU Announces Recipients of Prestigious University Research and Mentoring Awards", authored by Shaun McGillis, Research and Graduate Studies, PSU. Below is an excerpt:
Portland State University announces the 2021 awards for excellence for research, graduate mentoring and research administration. The awards are among the university's highest honors. They recognize and incentivize PSU faculty and staff excellence in research, scholarship, artistry and dedication to PSU students.
Recipients of the awards are some of the most dynamic faculty and staff members at PSU. Colleagues submit nominations; a jury of peers selects awardees based on the significance and quality of their research or creative achievements and extraordinary commitment to creating an environment supportive of research and student success. Join us as we celebrate this year’s awardees at the Research Awards Ceremony (online Friday, 3:30 - 5 PM Pacific) during...
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