portland state university | Transportation Research and Education Center

PSU Graduate Researcher Huajie Yang Explores Light Rail's Impacts on Ridership and Congestion

Jul 09, 2021

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...

NITC Dissertation Fellow Travis Glick Develops System-Level Transit Performance Metrics

Jun 22, 2021

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...

The Push to Cashless Transit Fare Leaves Some Riders Behind

Jun 10, 2021

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....

Looking Back on Twenty Years of Transportation Research with Dr. Jennifer Dill

May 26, 2021

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...

MURP student Francisco Ibarra Interns at Oregon Department of Transportation

May 21, 2021

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.

"This project is...

Student Spotlight: Jai Daniels, Portland State University

Mar 30, 2021

Jai Daniels is a first-year Master of Urban and Regional Planning (MURP) student at Portland State University, currently working with PSU's Transportation Research and Education Center (TREC) as a Graduate Research Assistant under faculty advisor John MacArthur. She is interested in urban livability, bicycle and pedestrian planning, transit planning, and the intersection between urban planning and the environment.

Tell us about yourself?

I grew up in a small town in North Carolina, often referred to as 'Mayberry.' Living near the Blue Ridge Parkway and not having much to do, apart from spending time outside, largely influenced both my passion for environmental conservation and my desire to travel. This in turn influenced what I chose to study. I graduated from the University of North Carolina at Chapel Hill in 2019 with a degree in environmental studies and minor in city and regional planning. Now, I live in Portland and am in my first year of the Master of Urban and Regional Planning program at Portland State University. Outside of school, I enjoy listening to podcasts, watching movies, taking film pictures, and hiking.

What (or who) has influenced your career path in transportation?

As an undergraduate student, I studied abroad in Copenhagen, Denmark, which sparked my...

New Transportation Curriculum for High School Students

Mar 18, 2021

We've just published a brand new set of four "How Walkable is Your Neighborhood?" education modules for high school students (download here)!

The modules, which can be taught in sequence or as standalone lessons, provide students with creative ways of observing transportation systems in their neighborhoods through collecting pedestrian data, critically evaluating accessibility, and learning about livable communities. Students will gain a deeper understanding of how people move through their community, and whether the transportation in their community is designed with the needs of all people in mind.

This curriculum was originally developed for the National Summer Transportation Institute (NSTI) - a STEM-focused transportation summer camp for high school students. In 2020, when the camps were converted to a virtual format for the first time, new tools had to be developed for student engagement and learning. These walkability modules were completed during the virtual camps, but are not dependent on a...

Portland's Transportation Wallet Increases Access to New Mobility Services

Mar 16, 2021

In June 2019, the City of Portland Bureau of Transportation (PBOT) launched a new incentive package aimed at making transportation more accessible for low-income households. In the "Transportation Wallet for Residents of Affordable Housing" pilot program, people living in affordable housing developments received access to free transportation options like transit passes, bike or scooter share memberships, rideshare and carshare credits.

Portland State University researchers evaluated the pilot program to find out how participants used the Transportation Wallet and how it helped them use different transport modes to get around.

A February 2021 paper in Transportation Research Record by Huijun Tan, Nathan McNeil, John MacArthur and Kelly Rodgers presents insights into the implementation and effectiveness of a transportation financial incentive program for low-income populations. Access the paper: "Evaluation of a Transportation Incentive Program for Affordable Housing Residents."

Main findings include:

The financial support of this program encouraged some participants to use new mobility services (including Uber/Lyft, bike share, and e-scooter) that they had never used before.
The program increased access for participants, helping them make more trips and, for some, get to places they otherwise could not have gone.
Transportation fairs, where...

Deploying Electric Buses to Improve Air Quality in Low-Income Areas

Mar 04, 2021

Led by Xiaoyue Cathy Liu of the University of Utah (UU) and funded by the National Institute for Transportation and Communities, researchers have created a web-based modeling tool (see GitHub repository built for the Utah Transit Authority) that enables U.S. transit providers to explore the impacts of changing over their systems to electric buses*. The researchers ran the model for TriMet in Portland, OR as well, with TriMet results and analysis presented in the final report (PDF).

"The interactive visualization platform lets users explore various electric bus deployment budget scenarios, so that transit agencies can plan the most cost-effective way to transition their fleet from diesel to electric buses – while prioritizing disadvantaged populations," Liu said.

The research team, at University of Utah, Portland State University (PSU), and University of California, Riverside, set out to answer three questions:

What costs and benefits are associated...

Introducing the Newest NITC Dissertation Fellow: Kelly Rodgers of Portland State

Feb 03, 2021

The National Institute for Transportation and Communities (NITC) is proud to introduce a new dissertation fellow: Kelly Rodgers of Portland State University. Four other NITC dissertation fellows were announced in summer 2020. Our NITC Dissertation fellowships applications are accepted on a rolling basis.

Kelly’s dissertation project will focus on "The use and influence of health indicators in transportation decision-making."

Research on health and transport has increased significantly in the past 20 years, both across health and transportation fields. Researchers and practitioners have called for the use of health indicators in transportation, which come amidst the growing emphasis on the use of indicators for transportation plans and projects in general. The underlying hope is that new procedural arrangements, such as measuring and tracking indicators, can turn policy goals into practice. This research project will explore the use and influence of health indicators in transportation using a mixed methods approach.

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What led you to choose transportation research as your career?

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