Transportation Commons^™

Changing The Focus Of Urban Transport From Congestion To Access, Jeffrey Gutman

Brookings Scholar Lecture Series

The traditional approach of urban transport planners has been to focus on the reduction of traffic congestion. More recently, with the growth of cities worldwide and the ever-present challenge of congestion, transport and urban planners have started to focus on the concept of access as the ultimate goal. How can we ensure and enhance access to jobs, education, commerce, and other services by all segments of the population? This requires a more complementary effort by transport planners and urban planners as well as finance and fiscal experts. The lecture will follow this shift in emphasis, the opportunities it poses, and …

Dynamic Assignment Models And Their Application In The Portland Metro Region, Peter G. Bosa

PSU Transportation Seminars

Metro's Research and Modeling Services Program is responsible for the development, maintenance, and application of travel demand models for application in long-range planning efforts in the Portland metropolitan region.

Representation of traffic—both vehicular and transit—plays an integral role in the travel demand modeling process. Complex software is required to assign vehicles and transit users to transportation networks to determine viable options available to travelers, costs associated with those options, and sets of routes by which travelers might navigate their trips.

Metro's current static assignment model has traditionally sufficed for use with Metro's four-step travel demand model. However, static assignments have …

Explaining Unequal Transportation Outcomes In A Gentrifying City: The Example Of Portland, Oregon, Eugenio Arriaga Cordero

Dissertations and Theses

This dissertation examines unequal outcomes of urban transportation policies in the neoliberal era. It focuses on inequalities in the Portland, Oregon metro area between 1994 and 2011 as measured in three key areas: 1) access to public transit; 2) the journey-to-work; and 3) "household-serving" trips. Growing concern over the harmful impacts from an increasing dependence on cars has led planners in the U.S. to encourage a modal shift from private car to public transit, bicycling, and walking. The required policies to make this modal shift possible, however, might inadvertently be benefiting "choice" riders at the cost of transport disadvantaged groups. …

Land Use Mix And Pedestrian Travel Behavior: Advancements In Conceptualization And Measurement, Steven Robert Gehrke

Dissertations and Theses

Smart growth policies have often emphasized the importance of land use mix as an intervention beholding of lasting urban planning and public health benefits. Past transportation-land use research has identified potential efficiency gains achieved by mixed-use neighborhoods and the subsequent shortening of trip lengths; whereas, public health research has accredited increased land use mixing as an effective policy for facilitating greater physical activity. However, despite the celebrated transportation, land use, and health benefits of improved land use mixing and the extent of topical attention, no consensus has been reached regarding the conceptualization and measurement of this key smart growth principle …

Bridging The Lng Knowledge Gap In The Baltic Sea Region: The Go Lng Initiative And The Establishment Of A Competence Centre, Dimitrios Dalaklis, Aykut Ölcer, Josefin A. Madjidian, Fabio Ballini, Momoko Kitada

Conference papers

No abstract provided.

Metropolitan Centers Mean Smart Growth, Richard D. Margerum, Rebecca Lewis, Keith Bartholomew

TREC Project Briefs

In this study, a multidisciplinary team from the University of Oregon and the University of Utah examined regional metropolitan center programs and policies in the Salt Lake City and Denver regions. The goal of the study was to examine this topic on two levels. First, to learn how and why local governments have adopted the concepts of metropolitan centers over time and the related supporting and constraining factors. Second, to understand how demographics, land use, and transportation choices have changed over time in the designated centers.

Making Every Mode Count In Washington State, Krista Nordback

TREC Project Briefs

A NITC report by Krista Nordback of Portland State University offers a step toward establishing a performance metric by which statewide progress with respect to bicycling and walking can be evaluated. The Washington State Pedestrian and Bicycle Miles Traveled Project discusses the relative merits of three different methods which can be used to compute bicycle miles traveled (BMT) and pedestrian miles traveled (PMT).

Metropolitan Centers: Evaluating Local Implementation Of Regional Plans And Policies, Richard D. Margerum, Keith Bartholomew, Rebecca Lewis, Robert Parker, Stephen Dobrinich

TREC Final Reports

The Denver and Salt Lake City Metropolitan Planning Organizations (MPOs) have embarked upon regional visioning strategies that promote development around higher density, mixed use centers with current or future access to transit. This study examines the programs and policies in the Salt Lake City and Denver regions to examine regional vision influence on local planning and the opportunities and constraints facing centers. The research team analyzed local plans over the past several decades, interviewed planners, and examined demographic, land use and transportation characteristics in select centers across the region. We found that the regional vision had a moderate influence on …

Modeling And Analyzing The Impact Of Advanced Technologies On Livability And Multimodal Transportation Performance Measures In Arterial Corridors: Phase 2, Miguel A. Figliozzi, Chawalit Tipagornwong

TREC Final Reports

Transportation corridors are complex systems. Tradeoffs, particularly in terms of traffic mobility, transit performance, accessibility and pedestrian interactions, are not well understood.When the focus is on motorized vehicle mobility and throughput, high traffic or vehicle speeds are desirable because at high speeds more vehicles can flow per unit of time and roadway section. However, high traffic/vehicles speeds are not desirable for pedestrians who have to cross urban arterials. In particular, pedestrians can be highly vulnerable at unsignalized, marked crosswalks where pedestrians have the right of way but where drivers’ yield rates are significantly lower than at signalized intersections. Pedestrians are …

Access To Taxicabs For Unbanked Households: An Exploratory Analysis In New York City, David A. King, Juan Francisco Saldarriaga

Journal of Public Transportation

Taxicabs are critical complements to public transit systems. In New York City, ubiquitous yellow cabs are as iconic as the city’s subway system, and the city recently added green taxicabs to improve taxi service in areas outside of the Central Business Districts and airports. In this paper, we used multiple datasets to explore taxicab fare payments by neighborhood and examine how paid taxicab fares are associated with use of conventional banking services. There are clear spatial dimensions of the propensity of riders to pay cash, and we found that both immigrant status and being “unbanked” are strong predictors of cash …

Identifying Key Factors Of Rail Transit Service Quality: An Empirical Analysis For Istanbul, Erkan Isikli, Nezir Aydin, Erkan Celik, Alev Taskin Gumus

Journal of Public Transportation

Providing a high quality of service in public transportation is essential to reduce dissatisfactions stemming from traffic congestion and noise. Public transport providers need to find ways to dilute the effects of immoderate use of private cars in big cities while maintaining a sufficient level of customer satisfaction. This study aimed to identify the key service quality (SQ) factors that drive passenger satisfaction in Istanbul’s rail transit (RT) system using data obtained from an extensive survey conducted by the Istanbul Public Transportation Co. A total of 11,116 passengers who used rail transport from May 15–June 3, 2012, and June 17–July …

Measuring The Accuracy Of Bus Rapid Transit Forecasts, John Perry

Journal of Public Transportation

The research of Dr. Bent Flyvbjerg in the 1990s and early 2000s showed that urban rail projects often cost more than estimated and carried fewer riders than projected, a troubling trend suggesting that the forecasts for urban rail projects were too optimistic in terms of cost and ridership. Inspired by that research, this analysis seeks to extend that framework to analyze Bus Rapid Transit (BRT). A study of forecast vs. actual costs and ridership was conducted for 19 BRT projects in the United States. From this, it was found that the cost projections for these projects tended to be quite …

Effect Of Price Reduction And Increased Service Frequency On Public Transport Travel, Inge Brechan

Journal of Public Transportation

A random effects meta-analysis of the results from 15 projects involving price reduction and 9 projects involving increased service frequency showed that both price reduction and increased service frequency generated public transport travels. On average, the increased service frequency projects generated more travels by public transport than the price reduction projects. In the increased service frequency projects the proportion of travels generated by the increased frequency was strongly influenced by the size of the frequency increase. In the price reduction projects, we did not find a significant effect of the size of the price reduction on the proportion of travels …

The Causal Effect Of Bus Rapid Transit On Changes In Transit Ridership, Orion T. Stewart, Anne Vernez Moudon, Brian E. Saelens

Journal of Public Transportation

Numerous studies have reported ridership increases along routes when Bus rapid transit (BRT) replaces conventional bus service, but these increases could be due simply to broader temporal trends in transit ridership. To address this limitation, we compared changes in ridership among routes where BRT was implemented to routes where BRT was planned or already existed in King County, Washington. Ridership was measured at 2010, 2013, and 2014. Ridership increased by 35% along routes where BRT was implemented from 2010 to 2013 compared to routes that maintained conventional bus service. Ridership increased by 29% along routes where BRT was implemented from …

Estimating Walking And Bicycling At The State Level, Krista Nordback, Mike Sellinger, Taylor Phillips

TREC Final Reports

Estimates of vehicle miles traveled (VMT) drive policy and planning decisions for surface transportation. No similar metric is computed for cycling and walking. What approaches could be used to compute such a metric on the state level? This report discusses three such approaches, identifies the advantages and disadvantages of each, and applies them to Washington State. The first approach employs travel survey data. The second approach is sample-based using pedestrian and bicycle count data. The third approach is an aggregate demand model approach using demographic data combined with count data. Due to data limitations, none of these methods could be …

A Model For Better Crosswalk Safety, Miguel Figliozzi

TREC Project Briefs

NITC researchers from Portland State University developed models to find what factors affected vehicles’ compliance with pedestrian safety laws.

The results suggest that treatments discouraging accelerating toward a crosswalk could help increase pedestrian safety.

Performance Measures To Assess Resiliency And Efficiency Of Transit Systems, Hani Nassif, Kaan Özbay, Devajyoti Deka, Peng Lou, Chaekuk Na, Sandeep Mudigonda, Yuan Zhu, Ender Faruk Morgul, Bekir Bartin, Ayman El-Awar

Mineta Transportation Institute

Transit agencies are interested in assessing the short-, mid-, and long-term performance of infrastructure with the objective of enhancing resiliency and efficiency. This report addresses three distinct aspects of New Jersey’s Transit System: 1) resiliency of bridge infrastructure, 2) resiliency of public transit systems, and 3) efficiency of transit systems with an emphasis on paratransit service.

This project proposed a conceptual framework to assess the performance and resiliency for bridge structures in a transit network before and after disasters utilizing structural health monitoring (SHM), finite element (FE) modeling and remote sensing using Interferometric Synthetic Aperture Radar (InSAR). The public transit …

Transportation Construction Work-Zone Safety Impact On Time-Related Incentive Contracting Projects, Jae-Ho Pyeon, Do Kim

Mineta Transportation Institute

Work-zone safety on highway projects continues to be a national concern, and project safety performance is one of the indicators of project success. Many contractors and State Transportation Agencies believe that expedited construction time under incentive contracting contributes to reducing the safety risk of road users traveling through work zones. However, the truth of this belief has never been measured or supported by any statistical evidence. Therefore, this research investigates the statistical relationship between time-related incentive road construction projects and frequency of vehicle crashes in California to understand the impact of time-related incentive provisions on project safety performance. The research …

Exploring The Positive Utility Of Travel And Mode Choice, Patrick Allen Singleton

PSU Transportation Seminars

Why do people travel? We traditionally assume traveling is a means to an end, travel demand is derived (from the demand for activities), and travel time is to be minimized. Recently, scholars have questioned these axioms, noting that some people may like to travel, use travel time productively, enjoy the experience of traveling, or travel for non-utilitarian reasons. The idea that travel can provide benefits and may be motivated by factors beyond reaching activity destinations is known as “the positive utility of travel” or PUT.

This study presents a conceptual and empirical look at the positive utility of travel and …

Individual Decision Making In Online Public-Participation Transportation Planning, Martin Swobodzinski

PSU Transportation Seminars

The empirical evaluation of complex decision support systems is often limited to the self-reported satisfaction of the systems’ users.

Such an approach is problematic due to the conflation of the user's satisfaction related to the decision support system and the decision making process and its outcomes.

In addition, it bears limitations that are common among most techniques that solicit participant-stated feedback.

In this talk, based on data that was gathered by a web-based participatory system for transportation planning in the Puget Sound region, I present analytical methods for the empirical evaluation of decision support systems based on human-computer interaction. In …

Improving Trip Data For Livable Communities, Kelly Clifton

TREC Project Briefs

NITC researchers work to refine a framework for trip generation that includes people walking, biking and riding transit.

Could E-Bikes Spur A New Wave Of Biking In America?, John Macarthur

TREC Project Briefs

In this NITC study, researchers provided participants with electric bicycles to use for a ten-week trial period and surveyed them about the experience.

Collective Multiagent Sequential Decision Making Under Uncertainty, Duc Thien Nguyen, Akshat Kumar, Hoong Chuin Lau

Research Collection School Of Computing and Information Systems

Multiagent sequential decision making has seen rapid progress with formal models such as decentralized MDPs and POMDPs. However, scalability to large multiagent systems and applicability to real world problems remain limited. To address these challenges, we study multiagent planning problems where the collective behavior of a population of agents affects the joint-reward and environment dynamics. Our work exploits recent advances in graphical models for modeling and inference with a population of individuals such as collective graphical models and the notion of finite partial exchangeability in lifted inference. We develop a collective decentralized MDP model where policies can be computed based …

Dynamic Repositioning To Reduce Lost Demand In Bike Sharing Systems, Supriyo Ghosh, Pradeep Varakantham, Yossiri Adulyasak, Patrick Jaillet

Research Collection School Of Computing and Information Systems

Bike Sharing Systems (BSSs) are widely adopted in major cities of the world due to concerns associated with extensive private vehicle usage, namely, increased carbon emissions, traffic congestion and usage of nonrenewable resources. In a BSS, base stations are strategically placed throughout a city and each station is stocked with a pre-determined number of bikes at the beginning of the day. Customers hire the bikes from one station and return them at another station. Due to unpredictable movements of customers hiring bikes, there is either congestion (more than required) or starvation (fewer than required) of bikes at base stations. Existing …

Evaluation Of An Electric Bike Pilot Project At Three Employment Campuses In Portland, Oregon, John Macarthur, Nicholas Kobel, Jennifer Dill, Zakari Mumuni

TREC Final Reports

Oregon, and Portland in particular, is internationally known for its love for bikes. Not only does the region have some of the highest bike ridership but the Oregon bike manufacturing industry is quickly growing. Oregon’s electric bike (e-bike) market is also growing but little data are available on the potential market and e-bike user behavior and interest. Only a limited amount of research has explored the potential new market segments for e-bikes and the economic, operational, safety, and transportation issues surrounding e-bikes in the United States. This report examines the results of an electric bike (e-bike) pilot project, which took …

Improving Trip Generation Methods For Livable Communities, Kelly J. Clifton, Nico Larco, Kristina Marie Currans, Jael Wettach-Glosser

TREC Final Reports

Recent efforts to improve trip generation data available for transportation impact analysis of new development include the collection of multimodal trip generation data, development of models that account for the built environment, and new recommendations for practice. Building on a long line of research on transportation and built environment, many studies have identified important features of the surrounding built environment that most impact trip rates and mode shares, building on a long line of research on transportation and the built environment. Despite these improvements in data and methods, less attention is placed on identifying the conditions of the site itself …

A Comparative Analysis Of High-Speed Rail Station Development Into Destination And Multi-Use Facilities: The Case Of San Jose Diridon, Anastasia Loukaitou-Sideris, Deike Peters, Paige Colton, Eric Eidlin

Mineta Transportation Institute

As a burgeoning literature on high-speed rail development indicates, good station-area planning is a very important prerequisite for the eventual successful operation of a high-speed rail station; it can also trigger opportunities for economic development in the station area and the station-city. At the same time, “on the ground” experiences from international examples of high-speed rail stations can provide valuable lessons for the California high-speed rail system in general, and the San Jose Diridon station in particular. This study identifies and draws lessons from European HSR stations that share similarities across several criteria with the San Jose area context. From …

The Challenge Of Protecting Transit And Passenger Rail: Understanding How Security Works Against Terrorism, Brian Michael Jenkins

Mineta Transportation Institute

Terrorists see transit and passenger rail as an attractive target. Designed for public convenience, trains and stations offer terrorists easy access to crowds of people in confined environments where there are minimal security risks and attacks can cause high casualties. This report examines the unique attributes of the terrorist threat, how security measures against terrorism have evolved over the years, and their overall effectiveness.

Does security work? Empirical evidence is hard to come by. Terrorist incidents are statistically rare and random, making it difficult to discern effects. The fact that terrorists focus most of their attacks on targets with little …

Estimating Reliability Indices And Confidence Intervals For Transit And Traffic At The Corridor Level, Travis B. Glick

PSU Transportation Seminars

As congestion worsens, the importance of rigorous methodologies to estimate travel-time reliability increases. Exploiting fine-granularity transit GPS data, this research proposes a novel method to estimate travel-time percentiles and confidence intervals. Novel transit reliability measures based on travel-time percentiles are proposed to identify and rank low-performance hotspots; the proposed reliability measures can be utilized to distinguish peak-hour low performance from whole-day low performance. As a case study, the methodology is applied to a bus transit corridor in Portland, Oregon. Time-space speed profiles, heatmaps, and visualizations are employed to highlight sections and intersections with high travel-time variability and transit low performance. …

Current Efforts To Make Bike Share More Equitable: A Survey Of System Owners And Operators, Steven Howland

PSU Transportation Seminars

The number of public bike share systems has been increasing rapidly across the United States over the past five to ten years. To date most academic research around bike share in the U.S. has focused on the logistics of planning and operationalizing successful systems. Investigations of system users and impacts on the local community are less common, and studies focused on efforts to engage underserved communities in bike share are rarer still. This paper utilizes a survey of representatives from 55 U.S. bike share systems to better understand and document current approaches toward serving low income and minority populations. The …