Public Affairs, Public Policy and Public Administration Commons^™

Improving Bicycle Crash Prediction For Urban Road Segments, Krista Nordback, Sirisha Kothuri, Wesley Marshall, Geoff Gibson, Nick Ferenchak

TREC Final Reports

The 2010 Highway Safety Manual (HSM) provides methods for predicting the number of motor vehicle crashes on various roadway facilities. However, it includes only a rudimentary method for predicting the number of bicycle-related crashes. Despite research demonstrating that bicycle volume is an important factor in estimating number of bicycle crashes, the method does not include the volume of bicyclists using the roadway. To remedy this, this project will investigate the potential of various simplified methods to include bicycle volumes in future versions of the HSM. By studying locations where bicycle traffic volumes, motor vehicle traffic volumes, bicycle collisions, and roadway …

Breaking Barriers To Bike Share: Insights From Bike Share Users, Nathan Mcneil, Jennifer Dill, John Macarthur, Joseph Broach

TREC Final Reports

This report seeks to provide more information about lower-income people and people of color who engage in bike share, including why they choose to become members, how they use the system, and how they benefit. The report looks at current and past bike share members, along with those who were involved in some type of equity-based outreach program. The findings draw from a survey intended to reach lower-income and/or people of color known to have engaged in bike share, either through membership or participating in events such as organized rides, in the same three cities studied in the resident report …

Building Planner Commitment: Are California’S Sb 375 And Oregon’S Sb 1059 Models For Climate-Change Mitigation?, Keith Bartholomew, David Proffitt

TREC Final Reports

California’s Sustainable Communities and Climate Protection Act (SB 375) and the Oregon Sustainable Transportation Initiative (SB 1059) have made them the first states in the nation to try and reduce greenhouse gas (GHG) emissions using the transportation-planning process. Evaluating how these pioneering laws have changed local planning processes – as well as plans themselves – in each state provides insight into the laws’ effectiveness at changing development patterns in a way that reduces GHG emissions, without waiting decades to see the effects in the built environment. Both states’ laws require metropolitan planning organizations (MPOs) and the municipalities that comprise them …

Evaluation Of Roadway Reallocation Projects: Analysis Of Before-And-After Travel Speeds And Congestion Utilizing High-Resolution Bus Transit Data, Miguel A. Figliozzi, Travis B. Glick

TREC Final Reports

The traditional process of identifying corridors for road diet improvements involves selecting potential corridors (mostly based on identifying fourlane roads) and conducting a traffic impact analysis of proposed changes on a selected roadway before implementing changes. The evaluation of roadway reallocation projects should include the analysis of traffic volumes, level of service, speeds, queue lengths and bus operations. There are tools and equipment to evaluate effectively traffic volumes and level of service changes in before-and-after studies. However, the detailed evaluation of speed and queue length distributions along a segment are significantly more cumbersome. In addition, the exhaustive evaluation of bus …

Active And Public Transportation Connectivity Between North Temple Tod And Jordan Park River Trail, Ivis Garcia Zambrana, Christie Oostema

TREC Final Reports

The project seeks to capitalize on existing community assets—several TOD stations and a regional bike and pedestrian trail system—by studying how these can be linked. The overarching goal of this project is to increase scholarship on networking safe routes that can encourage public and active transportation choices and thus, encourage a healthier lifestyle and advance sustainability. By expanding pedestrian, bicycle and transit connections to green space and offering the most potential for TOD, this proposal clearly demonstrates the greatest priorities of NITC. Moreover, nationwide, communities like Salt Lake’s West Side are in greater need of sustainable transportation choices that foster …

Racial Bias In Drivers' Yielding Behavior At Crosswalks: Understanding The Effect, Kimberly Barsamian Kahn, Jean M. Mcmahon, Tara Goddard, Arlie Adkins

TREC Final Reports

This project explores social identity factors (race and gender) that influence drivers’ behavior in interactions with pedestrians at crosswalks. One dangerous potential point of conflict for pedestrians within the transportation system is interactions with drivers at crosswalks (NHTSA, 2009). In 2010, there was one crash-related pedestrian death every two hours and an injury every eight minutes, and racial minorities are disproportionately represented in these pedestrian fatalities (CDC, 2013). In light of this disparity, this project examines whether racial discrimination occurs at crosswalks, which may lead to disparate crossing experiences and disproportionate safety outcomes. Racial minorities experience racial discrimination across various …

Does Compact Development Increase Or Reduce Traffic Congestion?, Reid Ewing, Guang Tian, Torrey Lyons

TREC Final Reports

From years of research, we know that compact development that is dense, diverse, well-designed, etc. produces fewer vehicle miles traveled (VMT) than sprawling development. But compact development also concentrates origins and destinations. No one has yet determined, using credible urban form metrics and credible congestion data, the net effect of these countervailing forces on area-wide congestion. Using compactness/sprawl metrics developed for the National Institutes of Health, and congestion data from the Texas Transportation Institute’s (TTI’s) Urban Mobility Scorecard Annual Report database, this study seeks to determine which opposing point of view of sprawl and congestion is correct. It does so …

The Effects Of Demand-Responsive Parking On Transit Usage And Congestion: Evidence From Sfpark, Nicole S. Ngo, Chandra Kiran Krishnamurth

TREC Final Reports

Parking is a serious issue in many urban areas, especially those experiencing rapid population growth. To address this problem, some cities have implemented demand-responsive pricing programs, where parking prices vary depending on the occupancy rate in a previous period. Yet, few empirical studies have rigorously evaluated these programs, though they have the potential to improve turnover and much needed parking availability in growing cities with limited infrastructure. In this study, we investigate the impacts of SFpark, a demand-responsive pricing parking program in San Francisco that began in 2011. We focus on metered, on-street parking and exploit the timing of SFpark …

Travel To Food: Transportation Barriers For The Food Insecure In Tampa Bay, Kevin Salzer, Ann Joslin

TREC Final Reports

In partnership with the Center for Urban Transportation Research (CUTR) at the University of South Florida (USF), the Transportation Innovation Group informed practical transportation solutions aimed at improved food access in Tampa Bay (Hillsborough, Pinellas and Pasco counties). The food pantry/bank sites that are part of Tampa Bay Network to End Hunger (TBNTEH) helped to gather data through a survey and interviews of food-related organizational leadership, staff and volunteers from each site to gain insight into how clients currently access emergency food sites (qualitative). This information was supplemented with a GIS analysis of transit accessibility for the food insecure in …

How Does Transportation Affordability Vary Among Tods, Tads, And Other Areas?, Brenda Scheer, Reid Ewing, Keunhyun Park, Shabnam Sifat Ara Khan

TREC Final Reports

Transit-oriented development (TOD) has gained popularity worldwide as a sustainable form of urbanism; it concentrates development near a transit station so as to reduce auto-dependency and increase ridership. Existing travel behavior studies in the context of TOD, however, are limited in terms of small sample size, inconsistent TOD classification methods, and failure to control for residential self-selection. Thus, this study has three research questions. First, how can we distinguish between Transit-oriented development (TOD) and Transit-adjacent development (TAD)? Second, how do travel behaviors vary between TODs and TADs? Third, how does transportation affordability vary between TODs and TADs? This study utilizes …

Changing Attitudes Toward Sustainable Transportation: The Impact Of Meta-Arguments On Persuasion, David M. Sanbonmatsu, David L. Strayer

TREC Final Reports

An experiment tested the effects of both communications about the functions of an attitude and communications about the functions of an attitude object on persuasion. Participants received a conventional message about the benefits of public transportation, a message about the benefits of positive public transportation attitudes, or a control message. Meta-arguments about the functions of attitudes led to more favorable evaluations and stronger intentions to use public transportation. These effects were moderated by the political and environmental orientation of participants. Surprisingly, the conventional message was not persuasive. The research is novel in showing that the communication of the functions of …

What Do We Know About Location Affordability In U.S. Shrinking Cities?, Joanna Ganning, Jenna Rosie Tighe

TREC Final Reports

In late 2013, the Department of Housing and Urban Development (HUD) launched the Location Affordability Index (LAI) portal. Their dataset uses models to estimate typical amount households spend on housing and transportation at the block group level, and calculates “H + T Affordability,” the percent of household income spent on these items. In our previous research, we analyzed 81 shrinking cities to determine how location affordability differs across various neighborhoods. Our results suggest that households in declining neighborhoods, as compared to stable or redeveloping neighborhoods, face the greatest H + T affordability challenges in shrinking cities. Furthermore, in declining neighborhoods, …

Impacts Of Bus Rapid Transit (Brt) On Surrounding Residential Property Values, Victoria Perk, Martin Catalá, Maximillian Mantius, Katrina Corcoran

TREC Final Reports

As bus rapid transit (BRT) grows in popularity in the United States, a better understanding of the mode’s impacts on land uses and property values is needed. Economic theory suggests, and literature has shown, that people are willing to pay higher housing costs to lower their costs of transportation to areas of economic activity. Does high-quality BRT service reliably provide such access and, thereby, increase residential property values? The hypothesis is that property values are higher closer to BRT stations, reflecting a premium for the access provided by the BRT service to various goods, services, employment, education, and recreation. There …

Planning Ahead For Livable Communities Along The Powell-Division Brt: Neighborhood Conditions And Change, Lisa K. Bates, Aaron Golub, Devin Macarthur, Seyoung Sung

TREC Final Reports

New transit investments can be a double-edged sword for disadvantaged communities (e.g., those included in environmental justice and Title VI protected classes). Transit investments improve communities’ mobility and access, and may improve health with reduced driving. However, there is also the potential for transit-oriented development (TOD) to spur gentrification and displacement if affordable housing is lost. Understanding transit corridor conditions and change with new infrastructure is important for learning how to mitigate negative effects and support inclusive communities with access to transit for lower-income households. The planning of a new bus rapid transit line along the Powell-Division corridor in Portland-Gresham …

Measuring The Impacts Of Social Media On Advancing Public Transit, Jenny H. Liu, Xuegang Ban, O. A. Elrahman

TREC Final Reports

This project is a collaboration between Portland State University (PSU) and the Center for Infrastructure Transportation & Environment (CITE) at Rensselaer Polytechnic Institute seeking to develop performance measures for assessing the impacts of social media on promoting public transit. Revolutionary changes have occurred in the communication landscape, and there has been a rapid diffusion of social media use as a means of communicating transit information to the public. Significant resources are being directed to the use of social media in communication, yet little effort exists that measures the impacts of these popular vehicles of communication. Rarely studied is the role …

Breaking Barriers To Bike Share: Insights From Residents Of Traditionally Underserved Neighborhoods, Nathan Mcneil, Jennifer Dill, John Macarthur, Joseph Broach, Steven Howland

TREC Final Reports

Evidence has shown that higher income and white populations are overrepresented in both access to and use of bike share. Efforts to overcome underserved communities’ barriers to access and use of bike share have been initiated in a number of cities, including those working with the Better Bike Share Partnership (BBSP) to launch and test potentially replicable approaches to improve the equity outcomes. This report describes findings from a survey of residents living near bike share stations placed in underserved communities of select BBSP cities: Philadelphia, Chicago, and Brooklyn. These were neighborhoods targeted for focused outreach related to BBSP programs, …

Peer-To-Peer Carsharing: Short-Term Effects On Travel Behavior In Portland, Or, Jennifer Dill, Nathan Mcneil, Steven Howland

TREC Final Reports

Peer-to-peer (P2P) carsharing is a relatively new concept in the U.S. Enabled by recent internet and mobile technology development, P2P carsharing generally involves a facilitating company connecting private vehicle owners to people who are interested in renting a vehicle. P2P carsharing has many things in common with business-to-consumer (B2C) carsharing services. Consumers join the service to rent vehicles on a short-term basis from locations dispersed throughout a certain area. Both services may allow households to reduce their private car ownership. However, P2P carsharing differs substantially from other models in that there are two distinct sets of consumers: those who rent …

Evaluating The Distributional Effects Of Regional Transportation Plans And Projects, Kristine Williams, Aaron Golub

TREC Final Reports

Metropolitan planning organizations (MPOs) have long been required to consider the equity implications of their regional transportation plans and processes. Funded by the National Institute for Transportation and Communities, this research aims to provide additional guidance to MPOs on how to evaluate distributional equity in regional plans and projects. The report begins with an overview of federal requirements related to equity in transportation planning. We then synthesize contemporary methods for measuring transportation equity and the distributional effects of plans and projects from a review of the literature and MPO plans and studies. The report concludes with exploratory case studies of …

Breaking Barriers To Bike Share: Insights On Equity From A Survey Of Bike Share System Owners And Operators, Steven Howland, Nathan Mcneil, Joseph Broach, Kenneth Rankins, John Macarthur, Jennifer Dill

TREC Final Reports

The number of public bike share systems has been increasing rapidly across the United States over the past five to 10 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 report uses a survey of representatives from 56 U.S. bike share systems to better understand and document current approaches toward serving low-income and minority populations. The survey …

Narratives Of Marginalized Cyclists: Understanding Obstacles To Utilitarian Cycling Among Women And Minorities In Portland, Or, Amy Lubitow

TREC Final Reports

Research has demonstrated that everyday or utilitarian forms of cycling are most likely to generate positive population-level health impacts (Garrard et al., 2012), yet significant deterrents to routine cycling remain, particularly for women and minorities. The primary aim of this project was to conduct a qualitative interview study that generated rich, narrative data regarding obstacles to routine or utilitarian cycling for women and minorities who already see biking as a viable form of transit, but who make relatively few bike trips. A secondary aim of the project was to develop a set of specific interventions that have the potential to …

Bike-Ped Portal: Development Of An Online Nonmotorized Traffic Count Archive, Krista Nordback, Kristin A. Tufte, Nathan Mcneil, Morgan Harvey, Michelle Watkins

TREC Final Reports

Robust bicycle and pedestrian data on a national scale would serve numerous purposes. Access to a centralized nonmotorized traffic count archive can open the door for innovation through research, design and planning; provide safety researchers with a measure of exposure; provide fundamental performance metrics for planning and funding decisions; and allow policymakers and transportation professionals to better support the public’s desire for livable communities. Numerous jurisdictions have initiated nonmotorized traffic count programs. However, many agencies and policymakers, who need data to support investment decisions, are in locations without a centralized count program. This lack of access to count data may …

Transportation Cost Index: A Comprehensive Performance Measure For Transportation And Land Use Systems And Its Application In Or, Fl, And Ut, Liming Wang, Jenny H. Liu

TREC Final Reports

MAP-21 and state laws are placing increasing emphasis on using comprehensive transportation performance measures that include mobility, safety, economy, livability, equity, and environmental to guide transportation decision-making. One of the toughest challenges keeping DOTs and MPOs from adopting comprehensive measures in the decision process is the lack of performance measures allowing consistent comparison of multimodal performance over time and across geographic areas. This project advances a transportation cost index (TCI) initially proposed by Oregon DOT from a proof-of-concept stage to implementation and operational use at the state, MPO, and community levels. After pilot tests and early adoption in Oregon, we …

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 …

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 …

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 …

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 Walkability Through Control Strategies At Signalized Intersections, Sirisha Murthy Kothuri, Andrew Kading, Edward J. Smaglik, Christopher Sobie

TREC Final Reports

As cities and communities nationwide seek to develop Complete Streets that foster livability and accommodate all modes, signal timing control strategies that include pedestrians in the operational decision process are gaining importance. This research tested several efficiency-focused pedestrian treatments – coordination, actuated-coordination, free operation, short cycle lengths – and safety-focused treatment including leading pedestrian intervals and Barnes Dance. Using a software-in-the-loop simulation, the operational impacts of these treatments on all users (vehicles, heavy vehicles, bicyclists and pedestrians) at an intersection were evaluated. Results showed that among the efficiency-based treatments, free operation was most beneficial for reducing minor-street pedestrian delays. Both …

Assessing State Efforts To Integrate Transportation, Land Use And Climate, Rebecca Lewis, Robert Zako

TREC Final Reports

Climate change is increasingly recognized as a threat to life on earth. “Continued emission of greenhouse gases will cause further warming and long-lasting changes in all components of the climate system, increasing the likelihood of severe, pervasive and irreversible impacts for people and ecosystems. Limiting climate change would require substantial and sustained reductions in greenhouse gas emissions” (International Panel on Climate Change, 2014, 8).

The transportation sector accounts for almost one-third of all greenhouse gas emissions (GHG) in the United States. Reducing GHG from transportation rests on the “three-legged stool” of improving vehicle efficiency, reducing the carbon content of fuels …

Introduction To Data Science For Transportation Researchers, Planners, And Engineers, Liming Wang

TREC Final Reports

Building on the successful scientific computing training program offered by the Software Carpentry (http://www.software-carpentry.org/), this course exposes students to the best practices in data science through hands-on lab sessions. Using transportation data and examples, it also aims to help students tackle the challenge of “drinking from a hose” when dealing with the overwhelming amount of data that is increasingly common in transportation research and practice.

Although computing is now an integral part of every aspect of science and engineering, transportation research included, most students of science, engineering, and planning are never taught how to build, use, validate, and share software …