Travel Behavior

Average Unfairness in Routing Games

Su, Pan-Yang
Alanqary, Arwa
Ferguson, Bryce
Wu, Manxi
Alexandre Bayen
Sastry, S. Shankar
2025

We propose average unfairness as a new measure of fairness in routing games, defined as the ratio between the average latency and the minimum latency experienced by users. This measure is a natural complement to two existing unfairness notions: loaded unfairness, which compares maximum and minimum latencies of routes with positive flow, and user equilibrium (UE) unfairness, which compares maximum latency with the latency of a Nash equilibrium. We show that the worst-case values of all three unfairness measures coincide and are characterized by a steepness parameter intrinsic to the latency...

sparkmobility: A Spark-based Python Library for Processing, Modeling, and Analyzing Large Mobility Datasets

Cao, Shangqing
Marta Gonzalez
2025

Location-Based Service (LBS) data, collected from personal mobile devices, have enabled significant advances in understanding human mobility patterns over the past decade. Extracting insights from these datasets typically involves using complex data-mining algorithms to detect, filter, and cluster stay locations. However, LBS datasets are often massive—ranging from tens to hundreds of gigabytes per day—posing serious computational challenges for traditional data processing tools. Libraries such as Pandas operate in a single-machine environment and require the entire dataset to fit into...

Assessing the Environmental, Economic and Social Benefits of Well-Located Workforce Housing

Rohe, W
Cowan, S
Rodriguez, Daniel
1012

The jobs-housing imbalance in many metropolitan areas contributes to long work commutes and the related problems of air pollution, traffic congestion, and loss of both discretionary income and time that could be spent in more productive and meaningful ways. This is a particular problem for low- and moderate-income workers who may have to travel long distances from their places of work to find affordable housing. This article presents a methodology for assessing the potential environmental, economic, and social benefits of constructing new affordable housing close to major employment...

Are Traffic Safety Rules and Experience Sufficient to Make Children Safe Pedestrians?

Rouse, J
Smith, R
Sessions, M
Combs, T
Rodriguez, Daniel
Sisiopiku, V
Schwebel, DC
2015

Pedestrian injury is among the top causes of death in North American children ages 5-12 (NCIPC, 2014). Research documents a wide range of factors that contribute to child pedestrian injury risk, but many contributing factors remain unknown and unevaluated. This study considered two such factors: institution of safety rules by parents and children’s experience crossing streets. We hypothesized both presence of parental rules about traffic safety and greater child pedestrian experience would be associated with safer pedestrian behavior in children.

Are Perceptions about Worksite Neighborhoods and Policies Associated with Walking?

Schwartz, MA
Aytur, SA
Evenson, KR
Rodriguez, Daniel
2009
To examine associations of the built environment surrounding worksites and of work policies with walking behaviors. Cross-sectional convenience sample survey. Workplace. Employed adults residing in Montgomery County, Maryland. Four different step measures taken at or near work as recorded using an accelerometer and a fifth measure indicated self-reported walking from work. Participants reported on eight built environment characteristics surrounding the worksite...

An Evaluation of the Accessibility Benefits of Commuter Rail in Eastern Massachusetts Using Spatial Hedonic Price Functions

Armstrong, RJ
Rodriguez, Daniel
2006

We estimate spatial hedonic price functions to examine local and regional accessibility benefits of commuter rail service in Eastern Massachusetts, while controlling for proximity-related negative externalities and other confounding influences. The data include 1,860 single-family residential properties from four municipalities with commuter rail service, and three municipalities without commuter rail service. We find some evidence of the capitalization of accessibility to commuter rail stations. Two model specifications suggest that properties located in municipalities with commuter...

Air Pollution, Social Disadvantage, and Walking in Six United States Cities: the Multi-Ethnic Study of Atherosclerosis

Chen, YH
Adar, S
Marshall, J
Hirsch, J
Rodriguez, Daniel
Evenson, K
Sampson, P
Magzamen, S
Kaufman, J
Roux, A
2016
Physical activity may be influenced by walking opportunities, which can differ substantially across neighborhoods. Air pollution similarly varies by location. It remains unclear whether more walking occurs in highly polluted neighborhoods and whether socially disadvantaged populations are less likely to experience walkable neighborhoods with clean air. We studied the spatial distributions and associations of neighborhood level air pollution, walkability, and social factors with self-reported walking. Overall walking was reported between 2010-2012 by 3,661 Multi-Ethnic Study of Atherosclerosis...

Advanced Modeling System for Forecasting Regional Development, Travel Behavior, and Spatial Pattern of Emissions

Rodriguez, Daniel
Song, Y
Morton, B
Rouphail, N
Frey, C
Khattak, A
2010

Can regional development patterns, over 50 years, influence quantity and spatial pattern of emissions from transportation in the Charlotte (NC) area?

Active Travel, Public Transportation Use, and Daily Transport Among Older Adults: The Association of Built Environment

Yang, Y
Xu, Y
Rodriguez, Daniel
Michael, Y
Zhang, H
2018
To examine active travel and public transportation use among U.S. older adults and the built environment characteristics associated with them. Total active travel, public transportation trips, travel purpose diversity, total and maximum distance traveled for older adults (>= 65 years) relative to middle age adults (45–64 years) as reported in the 2009 National...

A Comparative Case Study on Active Transport to and from School

Fesperman, CE
Evenson, KR
Rodriguez, Daniel
Salvesen, D
2008

This study investigates active-transport-to-school initiatives through the Active Living by Design Community Action Model framework. The framework outlines five strategies that influence physical activity: preparation, promotion, programs, policies, and physical projects. A comparative case study was conducted to investigate active-transport-to-school initiatives at two North Carolina schools. A group of key stakeholders from each site was interviewed (N = 16), including principals, physical education teachers, public safety officers, city planners, regional transportation planners, city...