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Statistical Inference For Multimodal Travel Time Reliability, Avinash Unnikrishnan, Miguel Figliozzi, Subhash C. Kochar 2022 Portland State University

Statistical Inference For Multimodal Travel Time Reliability, Avinash Unnikrishnan, Miguel Figliozzi, Subhash C. Kochar

TREC Final Reports

Travel time reliability is a key metric of interest to practitioners and researchers because it affects travel choice and the economic competitiveness of urban areas. This research focuses on three travel time reliability metrics – buffer index, modified buffer index, and the relative width of travel time distributions. The key novel contributions of this research include using the multivariate delta method to prove that the sampling distributions of the three travel time reliability metrics are asymptotically normal. The asymptotic standard error for the three reliability metrics is derived. The asymptotic normality and the standard error result are used to arrive at ...


Impacts Of City-Level Parking Cash-Out And Commuter Benefits Ordinances, Gabriella Abou-Zeid, Allen Greenberg 2022 ICF

Impacts Of City-Level Parking Cash-Out And Commuter Benefits Ordinances, Gabriella Abou-Zeid, Allen Greenberg

TREC Friday Seminar Series

For many workers, the decision to drive to work is an economically rational one that minimizes their commute costs. The vast majority of employers offer free workplace parking, with few in comparison offering benefits for transit, walking, biking, or other means of commuting. In effect, employers are incentivizing a behavior that increases roadway congestion, reduces physical activity, and increases emissions. Moreover, since lower-income households are less likely to own and have access to a private vehicle than moderate and higher-income households, free parking is a financial benefit that many lower-income employees cannot access.

Researchers from ICF and the Federal Highway ...


Damage Detection And Damage Localization In Bridges With Low-Density Instrumentations Using The Wave-Method: Application To A Shake-Table Tested Bridge, Mehran Rahmani, Xintong Ji, Sovann Reach Kiet 2022 California State University, Long Beach

Damage Detection And Damage Localization In Bridges With Low-Density Instrumentations Using The Wave-Method: Application To A Shake-Table Tested Bridge, Mehran Rahmani, Xintong Ji, Sovann Reach Kiet

Mineta Transportation Institute Publications

This study presents a major development to the wave method, a methodology used for structural identification and monitoring. The research team tested the method for use in structural damage detection and damage localization in bridges, the latter being a challenging task. The main goal was to assess capability of the improved method by applying it to a shake-table-tested prototype bridge with sparse instrumentation. The bridge was a 4-span reinforced concrete structure comprising two columns at each bent (6 columns total) and a flat slab. It was tested to failure using seven biaxial excitations at its base. Availability of a robust ...


Community Transportation Academy: Course Curriculum And Implementation Handbook, Nathan McNeil, Keith Bartholomew 2022 Portland State University

Community Transportation Academy: Course Curriculum And Implementation Handbook, Nathan Mcneil, Keith Bartholomew

TREC Final Reports

A Community Transportation Academy (CTA) is a course that harnesses the knowledge, technical expertise and passions of practicing transportation professionals in a city to immerse a cohort of interested and dedicated community members in transportation issues over a two to three month curriculum.

The CTA curriculum was developed by drawing from the Portland Traffic and Transportation (PTT or Portland CTA) course, along with the Wasatch Transportation Academy (WTA or Wasatch CTA, which was inspired by the Portland course). Planning academy courses in cities around the country are also good models to look to for how to structure and operate such ...


Towards An Optimal Bus Frequency Scheduling: When The Waiting Time Matters, Songsong MO, Zhifeng BAO, Baihua ZHENG, Zhiyong PENG 2022 Wuhan University

Towards An Optimal Bus Frequency Scheduling: When The Waiting Time Matters, Songsong Mo, Zhifeng Bao, Baihua Zheng, Zhiyong Peng

Research Collection School Of Computing and Information Systems

Reorganizing bus frequencies to cater for actual travel demands can significantly save the cost of the public transport system. This paper studies the bus frequency optimization problem considering the user satisfaction. Specifically, for the first time to our best knowledge, we study how to schedule the buses such that the total number of passengers who could receive their bus services within the waiting time threshold can be maximized. We propose two variants of the problem, FAST and FASTCO, to cater for different application needs and prove that both are NP-hard. To solve FAST effectively and efficiently, we first present an ...


Measuring The Exposure And Vulnerability Of Transit Riders To Cold Temperatures In London, Ontario, Armin Mahboubi 2022 Western University

Measuring The Exposure And Vulnerability Of Transit Riders To Cold Temperatures In London, Ontario, Armin Mahboubi

Undergraduate Student Research Internships Conference

Due to the expansion of suburban areas in many cities around the world, accessibility to public transit through walking has become a new challenge for riders. Considering the impacts of climate change in creating more extreme weather, such as extreme cold, heat, or flooding, transit riders may thus be at a higher risk of exposure for various weather-related illnesses (Fraser & Chester, 2016).

Using ArcGIS Pro and ArcMap software, and data collected from City of London’s Open Portal, the United States Geological Survey, Open Mobility Data, and Statistics Canada, the exposure and vulnerability of transit riders to cold temperatures in ...


Planning For Micromobilities In Canada: Transportation Policy Review, Nathaniel C. Frisbee BA, Jason Gilliland PhD, Jinhyung Lee PhD 2022 Western University

Planning For Micromobilities In Canada: Transportation Policy Review, Nathaniel C. Frisbee Ba, Jason Gilliland Phd, Jinhyung Lee Phd

Undergraduate Student Research Internships Conference

Canadian municipalities face a complex decision on how they tackle the ‘wicked problem’ of climate change over the next decades. One form of sustainable transportation that municipalities could pursue is light electric vehicles (LEVs), commonly referred to as e-bikes and e-scooters or referred to as a Power Assisted-Bicycle by Transportation Canada. Transportation-related policies and plans of Canadian municipalities were evaluated for their consideration of LEVs. Municipalities were selected based on having a university campus within their boundaries, as this is where the highest density of Canadian population resides. The analysis spreads across all 10 provinces in Canada.  There are significant ...


A Qualitative Look Into Repair Practices, Jumana Labib 2022 Western University

A Qualitative Look Into Repair Practices, Jumana Labib

Undergraduate Student Research Internships Conference

This research poster is based on a working research paper which moves beyond the traditional scope of repair and examines the Right to Repair movement from a smaller, more personal lens by detailing the 6 categorical impediments as dubbed by Dr. Alissa Centivany (design, law, economic/business strategy, material asymmetry, informational asymmetry, and social impediments) have continuously inhibited repair and affected repair practices, which has consequently had larger implications (environmental, economic, social, etc.) on ourselves, our objects, and our world. The poster builds upon my research from last year (see "The Right to Repair: (Re)building a better future"), this ...


Transportation As A Barrier To Healthcare Access For Older Adults Of Low Socioeconomic Status, Yanira Barajas, Susan MacDermott, Jazminne Orozco Arteaga 2022 University of St. Augustine for Health Sciences

Transportation As A Barrier To Healthcare Access For Older Adults Of Low Socioeconomic Status, Yanira Barajas, Susan Macdermott, Jazminne Orozco Arteaga

Virtual OTD Capstone Symposium, Summer 2022

The older adult population of those in the age group 65+ is one of the fastest growing populations in the following years. This project sought to identify what barriers older adults of low socioeconomic status face when trying to access transportation to healthcare appointments. The project also sought to understand what barriers healthcare professionals saw when their senior clients tried using transportation as well as what opportunities occupational therapists have to address the barriers if any. There was a theme of disconnect which appeared between healthcare professionals and their senior clients across multiple healthcare disciplines. This project was able to ...


Pathway To Promote Diversity Within Public Transit Workforce, Mehri Mohebbi, Sumita Raghuram, Ahoura Zandiatashbar 2022 University of Florida Transportation Institute (UFTI)

Pathway To Promote Diversity Within Public Transit Workforce, Mehri Mohebbi, Sumita Raghuram, Ahoura Zandiatashbar

Mineta Transportation Institute Publications

There are many aspects of the transportation industry that can be focused on, but the lack of resiliency is one of the most urgent. Enhancing resiliency and creative problem-solving is essential to the industry’s growth and survival. But it cannot happen without building a more diverse workforce. Women still make up a small fraction of transportation workers, and African American and Hispanic employees are even less represented. These disparities are increasingly pronounced in many senior positions, particularly in STEM fields. Meanwhile, the public transportation industry is experiencing a severe and worsening workforce shortage and many agencies have reported substantial ...


“Tele-Commuting” During The Covid-19 Pandemic And Beyond: Unveiling State-Wide Patterns And Trends Of Telecommuting In Relation To Transportation, Employment, Land Use, And Emissions In Calif, Tianjun Lu, Jian-yu Ke, Fynnwin Prager, Jose N. Martinez 2022 California State University, Dominguez Hills

“Tele-Commuting” During The Covid-19 Pandemic And Beyond: Unveiling State-Wide Patterns And Trends Of Telecommuting In Relation To Transportation, Employment, Land Use, And Emissions In Calif, Tianjun Lu, Jian-Yu Ke, Fynnwin Prager, Jose N. Martinez

Mineta Transportation Institute Publications

Telecommuting, the practice of working remotely at home, increased significantly (25% to 35%) early in the COVID-19 pandemic. This shift represented a major societal change that reshaped the family, work, and social lives of many Californians. These changes also raise important questions about what factors influenced telecommuting before, during, and after COVID-19, and to what extent changes in telecommuting have influenced transportation patterns across commute modes, employment, land use, and environment. The research team conducted state-level telecommuting surveys using a crowd-sourced platform (i.e., Amazon Mechanical Turk) to obtain valid samples across California (n=1,985) and conducted state-level interviews ...


Launching The Wasatch Transportation Academy, Nathan McNeil, Keith Bartholomew, Matthew Ryan 2022 Portland State University

Launching The Wasatch Transportation Academy, Nathan Mcneil, Keith Bartholomew, Matthew Ryan

TREC Final Reports

The “Community Transportation Academy” model seeks to break down the barriers for community members to participate in transportation decision-making processes. Since 1991, the Portland Traffic and Transportation Course has held at least one course each year, connecting Portland residents with top planners, engineers, and decision-makers from agencies working on transportation in the region, with the goal of conveying the factors professionals consider, ranging from technical considerations, legal and policy mandates, other tradeoffs, and how the community can engage with and influence decisions. This project sought to implement a transportation academy in the Salt Lake City region inspired by the Portland ...


Rideshare Practices In Developing Countries Vs Developed Countries, Francis Wambalaba 2022 United States International University, Kenya

Rideshare Practices In Developing Countries Vs Developed Countries, Francis Wambalaba

TREC Friday Seminar Series

This project investigated strategies towards development, marketing and implementation of employer programs for reducing single occupancy vehicles to mitigate traffic congestion. It was guided by the following research questions: which socio-economic factors influence carpooling; how do environmental factors influence carpooling; and what are effective traffic management strategies for enhancing carpooling. The presentation will also strive to introduce the US context for purposes of perspective.


The True Cost Of Auto Insurance In The Mountain West, 2022, Annie Vong, Saha Salahi, Caitlin J. Saladino, William E. Brown Jr. 2022 University of Nevada, Las Vegas

The True Cost Of Auto Insurance In The Mountain West, 2022, Annie Vong, Saha Salahi, Caitlin J. Saladino, William E. Brown Jr.

Transportation & Infrastructure

This fact sheet examines data on average annual premiums, percent of income spent on auto insurance, and life events associated with the rising cost of auto insurance in the Mountain West (Arizona, Colorado, Nevada, New Mexico, and Utah). The original report includes data on national averages for auto insurance premiums for all fifty states.


Connected Simulation For Work Zone Safety Application, Vahid Balali 2022 California State University, Long Beach

Connected Simulation For Work Zone Safety Application, Vahid Balali

Mineta Transportation Institute Publications

Every year, over 60,000 work zone crashes are reported in the United States (FHWA 2016). Such work zone crashes have resulted in over 4,400 fatal and 200,000 non-fatal injuries in the last 5 years (FHWA 2016, BLS 2014). Apart from the physical and emotional trauma, the annual cost of these injuries exceeds $4 million-representing significant wasted resources. To improve work zone safety, this research developed a system architecture for unveiling high-risk behavioral patterns among highway workers, equipment operators, and drivers within dynamic highway work zones. This research implemented the use of a connected virtual environment, which is ...


Manual For Asphalt Pavement Repair And Resurfacing Preparation, DingXin Cheng, Gary Hicks, Roger D. Smith 2022 California State University, Chico

Manual For Asphalt Pavement Repair And Resurfacing Preparation, Dingxin Cheng, Gary Hicks, Roger D. Smith

Mineta Transportation Institute Publications

Timely repairs of pavement defects are essential in protecting an important investment and asset that public agencies have. These repairs may be made as durable “stand-alone” repairs of isolated problems, or as part of preparations for a total resurfacing. This manual provides basic information on the planning, materials and construction aspects of common pavement repairs such as crack sealing, crack filling, and patching, as well as a broader look at other preparations needed for total resurfacing a pavement, whether the resurfacing is a surface treatment or a thin hot mix asphalt (HMA) overlay.


Biological Hydrogen Gas Production From Food Waste As A Sustainable Fuel For Future Transportation, Pitiporn Asvapathanagul, Leanne Deocampo, Nicholas Banuelos 2022 California State University, Long Beach

Biological Hydrogen Gas Production From Food Waste As A Sustainable Fuel For Future Transportation, Pitiporn Asvapathanagul, Leanne Deocampo, Nicholas Banuelos

Mineta Transportation Institute Publications

In the global search for the right alternative energy sources for a more sustainable future, hydrogen production has stood out as a strong contender. Hydrogen gas (H2) is well-known as one of the cleanest and most sustainable energy sources, one that mainly yields only water vapor as a byproduct. Additionally, H2 generates triple the amount of energy compared to hydrocarbon fuels. H2 can be synthesized from several technologies, but currently only 1% of H2 production is generated from biomass. Biological H2 production generated from anaerobic digestion is a fraction of the 1%. This study aims to enhance biological H2 production ...


Design Of An Evaluation Plan For Senate Bill 1046, Maria Chierichetti, Armin Moghadam, Fatemeh Davoudi 2022 San Jose State University

Design Of An Evaluation Plan For Senate Bill 1046, Maria Chierichetti, Armin Moghadam, Fatemeh Davoudi

Mineta Transportation Institute Publications

In an effort to understand and decrease alcohol-impaired driving as a primary collision factor In California, the research team designed an evaluation plan for California Senate Bill 1046 and its focus on ignition interlock devices as a sentence for Driving Under Influence offense. This plan will evaluate whether Senate Bill 1046 affected the Driving Under the Influence crash frequency and severity, and whether sociodemographic and geographic factors influence its effectiveness. This report lays the foundation for the evaluation that will be conducted in 2024. The research team conducted a meta-analysis of the last 12 years of literature and research on ...


Aligning The Transit Industry And Their Vendors In The Face Of Increasing Cyber Risk: Recommendations For Identifying And Addressing Cybersecurity Challenges, Scott Belcher, Terri Belcher, Kathryn Seckman, Brandon Thomas, Homayun Yaqub 2022 Mineta Transportation Institute

Aligning The Transit Industry And Their Vendors In The Face Of Increasing Cyber Risk: Recommendations For Identifying And Addressing Cybersecurity Challenges, Scott Belcher, Terri Belcher, Kathryn Seckman, Brandon Thomas, Homayun Yaqub

Mineta Transportation Institute Publications

Public transit agencies in the United States depend on external vendors to help deliver and maintain many essential services and to provide critical technologies, from ticket purchases to scheduling to email management. While the integration of new, advanced technologies into the public transit industry brings important advancements to U.S. critical transportation infrastructure, the application of digital technologies also brings with it a new assortment of digital risks. Transit agencies of all sizes are finding themselves subject to cyber incidents—most notably ransomware attacks—like those experienced by larger, more prominent companies and critical infrastructure providers. The findings in this ...


Contracting Strategies: A Different Approach To Address Long-Term Performance, Maria Calahorra-Jimenez 2022 California State University, Fresno

Contracting Strategies: A Different Approach To Address Long-Term Performance, Maria Calahorra-Jimenez

Mineta Transportation Institute Publications

For cost-efficiency, public safety, and sustainability, improving long-term performance in highway projects is imperative for public administrations. Project delivery and procurement methods provide an opportunity to align design and construction processes with this goal. While previous studies have explored whether project delivery methods impact the long-term performance of highway projects, these studies did not focus on how core elements within project procurement relate to long-term performance. Thus, to fill this gap, this research explores how and to what extent long-term evaluation criteria are considered in design-build best-value procurement of highway projects. To this end, the team conducted content analysis on ...


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