Transportation Commons^™

Quantitative Assessment Of Cybersecurity Risk Variability Across Transportation Modes, Paulo Carreon

Doctoral Dissertations and Master's Theses

Transportation systems are increasingly dependent on digital technologies, networked communications, and cyber-physical integration, making cybersecurity an important issue for operational continuity, resilience, and safety. Although cybersecurity risks in transportation are widely recognized, much of the existing research remains mode-specific and lacks a standardized quantitative framework for comparing risk across transportation systems. This study develops a quantitative, incident-based approach for assessing cybersecurity risk variability across four major transportation modes: Aviation, Maritime, Rail, and Road. The study is based on a manually constructed dataset of 189 publicly reported transportation cybersecurity incidents collected from 2000 to 2025. Each incident was coded into structured …

Empirical Results From The Eliminations Of Municipal Minimum Parking Requirements, David A. Griffith

Honors Theses

Minimum Parking Requirements (MPR) are municipal zoning ordinances mandating a set number of off-street parking spaces for new developments. Since the 1950s, MPR has been the near-universal way American municipalities supply parking, though growing criticisms since the late 1990s have targeted the policy for distorting development patterns, imposing high costs, and subsidizing personal vehicle use. Beginning in the early 2010s and increasingly in the early 2020s, cities and counties across the United States have moved to reform or eliminate MPR. This paper is the first empirical study of the economic effects of these removals. Using a two-way fixed-effects difference-in-differences OLS …

Increasing Access To Rural Resources: A Spatial Exploration Of The Social Implications Of Mobility In Appalachian Kentucky., Anna Morris

College of Arts & Sciences Senior Theses

Mobility and accessibility are key predictors in the way that people navigate their communities. However, many rural areas lack holistic transportation systems that support the needs of a diverse range of users. As a result, rural residents, especially rural non-drivers, often face barriers to equitable mobility and access to necessary resources, like healthcare. This study examines the role that mobility plays in facilitating access to healthcare facilities for driving and non-driving populations in Appalachian Kentucky. The study pairs the Enhanced 2-Step Floating Catchment Area method with a demographic index to evaluate mobility equity through spatial accessibility to primary care facilities. …

Factors Affecting Pedestrian-Vehicle Conflicts: An Empirical Analysis, Christo D. Jamo

Honors Scholar Theses

The number of pedestrian deaths increased by 78% between 2009 and 2023, while other motor vehicle crash deaths increased by 13% in the same period [1]. To identify potential pedestrian safety measures, this study analyzed the effects of location-based demographics, pedestrian phasing type, and other physical infrastructure and behavior variables on the probability of pedestrian-vehicle conflicts at signalized intersections, which is a surrogate measure of crash risk. Data were collected from 55 intersections in Connecticut, and the pedestrian-vehicle interactions were classified by severity based on the Swedish Traffic Conflict Technique: undisturbed passage, potential conflict, minor conflict, or serious conflict. Because …

Transparency And Accessibility In State Transportation Performance Reporting: A Systematic Examination Of State Department Of Transportation Websites Under Map-21, Jack Alan Klee

Dissertations

In the United States, all 50 State Departments of Transportation (DOTs) rely on federal funding as a key revenue source for roadway preservation programs. The 2012 Moving Ahead for Progress in the 21st Century (MAP-21) Act introduced a performance-based framework for transportation policy, establishing seven national goal areas that require state DOTs to report performance outcomes. As MAP-21 reaches its ten-year milestone, this dissertation investigates the extent to which state DOTs demonstrate transparency and accessibility in reporting federally mandated performance management results. Despite the centrality of performance reporting to accountability and public trust, systematic evaluations of these dimensions remain limited …

Good Life Automobility: Cultural/Rhetorical Resistance And Persistence Of Us Car Hegemony, Trinity O. Thompson

Department of Communication Studies: Dissertations, Theses, and Student Research

This project takes the car as a historical signifier of a rhetorical racialization process that enables a hypermobile white, masculine, neoliberal identity that pervades conceptions of mobility in the West. I locate these overlapping social formations under a cultural logic of good life automobility (GLA) that positions cars, a quintessential form of private property, as a motivator for a contemporary “good life” citizenship identity that cultivates neoliberal subjectivities of free movement and market consumption in contempt of socialized and racialized public transit futures. The introduction chapter elaborates on the boundaries of GLA while also contextualizing the two analysis chapters through …

Constructing Modern Cities For The People: Perspectives On Urban Transport Policy Orientation, Guangtao Wang, Jian An, Jifeng Wang, He Wei

Bulletin of Chinese Academy of Sciences (Chinese Version)

Based on a review of research achievements in “Urban Transport Science” over the past decade and a renewed understanding of the inherent laws governing cities and urban transport, this study clarifies the essential nature of urban transport as a fundamental public service of cities. Grounded in the requirements of constructing modern cities of the people, the study proposes an overarching strategy of “supporting the construction of modern cities of the people through high-quality urban transport”. From the dimensions of supporting and guiding the urban planning system, advancing digital and information technologies, and enhancing the level of basic public services, the …

Does What Happens In Vegas Increase Pedestrian Safety? A Longitudinal Study On The Effectiveness Of Pedestrian Bridges, Jalen Paulos, Jalen Paulos, Joaquin Del Mundo, Brock Wentz

School of Medicine Research Poster Showcase

Urban populations continue to rise and the frequency that pedestrians are exposed to vehicular traffic continues to increase. The result is an increase in automobile versus pedestrian collisions. This study aims to determine the efficacy of pedestrian bridges in reducing the rates of automobile-pedestrian collisions. Data for all automobile versus pedestrian collisions and injuries from July of 1997 through December of 2023 at four distinct intersections along Las Vegas Boulevard were retrieved from the Nevada Department of Transportation. These sites were chosen because of their historically high rates of automobile versus pedestrian incidents and the construction of pedestrian bridges at …

Exploring The Stress-Strain Relationship Of Lightweight Concrete To Enhance The Lifecycle Performance Of Transportation Highways And Bridges, Fariborz M. Tehrani

Mineta Transportation Institute

Concrete is the primary construction material of bridges, roads, and other transportation infrastructure across the United States, but conventional normal-weight concrete (NWC) is heavy, prone to cracking, and expensive to maintain over time. This study examines the mechanical properties, durability, and lifecycle performance of lightweight aggregate concrete (LWC) and internally cured concrete (ICC) as alternatives in transportation infrastructure applications. Through laboratory testing, computer modeling, and lifecycle analysis, the research evaluates how these materials perform in terms of strength, flexibility, durability, cost, and environmental impact. The results show that LWC and ICC can meet required strength levels while being lighter and …

Spatiotemporal Dynamics Of Daily And Per Capita Vmt In California: A County-Level Analysis (2019–2023), Yong Lao, Bo Yang

Mineta Transportation Institute

Vehicle miles traveled (VMT) is a fundamental metric for assessing mobility trends and infrastructure needs. This study examines the spatial-temporal dynamics of daily VMT (DVMT) and per capita DVMT across California counties from 2019 to 2023, covering the pre-, mid-, and post-pandemic periods via GIS mapping and k-means clustering. To identify determinants of per capita DVMT, we compared traditional linear regression approaches (OLS, Ridge, LASSO, Elastic Net) with ensemble tree-based models. Specific results include: the ensemble models estimated using 2019–2022 data delivered substantially higher accuracy, achieving R² values exceeding 0.98; meanwhile, out-of-sample performance on 2023 data remained robust (R² ≈ …

Evaluating The Impact Of Leading Pedestrian Intervals And Curb Extensions On Conflict Frequency And Severity, Sophia Semensky

Dissertations and Theses

Leading Pedestrian Intervals (LPIs) and curb extensions are commonly implemented countermeasures intended to improve pedestrian safety at signalized intersections. While LPIs have a well-established crash reduction record, fewer studies have evaluated their impacts using surrogate safety measures or examined how curb extensions interact with LPIs to influence pedestrian-vehicle conflicts. This thesis investigates the effects of LPIs and curb extensions on pedestrian safety using detailed conflict data collected at eleven signalized intersections in the Portland, Oregon metropolitan area.

Approximately 600 hours of video data were collected across four matched intersection pairs and three before–after sites. Pedestrian and vehicular volumes, turning speeds, …

Does What Happens In Vegas Increase Pedestrian Safety? A Longitudinal Study On The Effectiveness Of Pedestrian Bridges, Jalen Paulos, Joaquin Miguel Del Mundo, Brock Wentz, Janel Pietryga

Department of Orthopaedics Faculty Research

Urban populations continue to rise and the frequency that pedestrians are exposed to vehicular traffic continues to increase. The result is an increase in automobile versus pedestrian collisions. This study aims to determine the efficacy of pedestrian bridges in reducing the rates of automobile‒pedestrian collisions. Data for all automobile versus pedestrian collisions and injuries from July 1997 through December 2023 at four distinct intersections along Las Vegas Boulevard were retrieved from the Nevada Department of Transportation. These sites were chosen because of their historically high rates of automobile versus pedestrian incidents and the construction of pedestrian bridges at three of …

Weather Rescue At Sea: Recovering Historical Weather Observations From 19th Century British Naval Ships, Praveen Teleti, Ed Hawkins, Clive Wilkinson

Research Collection College of Integrative Studies

Ship logbooks represent a critical source of historical meteorological data, providing valuable observations of barometric pressure, air temperature, sea surface temperature, wind force and direction, and other variables. Substantial quantities of these records are unavailable to climate science as they have not yet been transcribed. We present ‘Weather Rescue at Sea’, a citizen-science project which transcribed millions of weather observations contained in 19th Century UK Royal Navy ship logbooks. We describe the logbook structure and weather observation-taking instructions and discuss significant challenges with the translation of handwritten text into accurate data due to errors arising from ambiguous handwriting, historical terminology, …

Causality-Aware Safety Testing For Autonomous Driving Systems, Wenbing Tang, Mingfei Cheng, Renzhi Wang, Yuan Zhou, Chengwei Liu, Yang Liu, Zuohua Ding

Research Collection School Of Computing and Information Systems

Simulation-based testing is essential for evaluating the safety of Autonomous Driving Systems (ADSs). Comprehensive evaluation requires testing across diverse scenarios that can trigger various types of violations under different conditions. While existing methods typically focus on individual diversity metrics, such as input scenarios, ADS-generated motion commands, and system violations, they often fail to capture the complex interrelationships among these elements. For instance, identical motion commands can produce different collision risks in varying scenes, and the same collision may result from different commands under different scenarios. This oversight leads to gaps in testing coverage, potentially missing critical issues in the ADS …

Evaluation Of Transportation Policy Effectiveness In The United States: Case Of Personal Electric Vehicles And Commercial Electronic Logging Devices, Hania Afzal

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Together, electric vehicle (EV) adoption and the electronic logging device (ELD) mandate illustrate two dimensions of transportation technology policy: the first driven largely by environmental and market-based incentives and the second by safety regulation and compliance requirements. Examining these cases side by side for the United States allows for a more comprehensive analysis of how technology adoption unfolds under different policy regimes, offering insights into the broader relationship between policy design, industry response, and public outcomes. The commercial motor vehicle (CMV) sector presents a different but equally important policy challenge in transportation technology adoption. Unlike consumer passenger vehicles, CMVs are …

Measuring Multimodal Equity In Resource-Challenged Mpos, Christopher Ferrell, David Reinke, John M. Eells

Mineta Transportation Institute

Ensuring transportation investments are equitable across different populations and travel modes is a priority for many agencies, yet existing tools often make these assessments difficult, especially for smaller and resource-constrained organizations. To address this gap, this report provides the findings of Phase II of our study on reviewing and developing transportation equity metrics. The Phase I project investigated transit equity metrics and provided recommendations on advancements in quantitative methods. Building on Phase I recommendations, this study investigates low-cost methods for comparing the equity between auto (roadway) and transit performance or investments for low resource transportation agencies. A literature review revealed …

What Holds High-Speed Rail Back: Lessons From Global Systems And California’S Experience, Deepak K. Sharma, Rajnish Lekhi, Scott Parr

Mineta Transportation Institute

This report examines benefits and challenges of integrating California High-Speed Rail (CHSR) with other rail systems and reviews California legislation impacting HSR’s contracting and financing alternatives. The research compares CHSR with high-speed rail systems around the world to identify similarities and differences in costs, speeds, ridership, and operating conditions. It also reviews Japan’s Land Readjustment Act as a model for value capture and land assembly and explores international experiences on rail integration, along with U.S. cases from the East Coast and Los Angeles. A review of California’s transportation legislation highlights how laws for highways and bridges differ from those for …

Cycling Past 50: A Closer Look Into The World Of Older Cyclists, Year 5 Survey, Carol Kachadoorian

Mineta Transportation Institute

This document reports on approximately 2,800 responses to a North American survey of older adults who cycle. The survey, open from March 2024 through February 2025, included questions that captured a person’s cycling over their life course, as well as their current cycling styles, habits, and preferences. Responses reflect the impact of various factors on an older adult’s cycling habits with respect to their ability and agility and their expectation to continue cycling. The survey asked about falls and near misses in the past year, coding fall descriptions into six categories and sorting them by the respondent’s gender and age. …

Equity Evaluation Of Residents’ Transit+Walk Accessibility To Sacramento Healthcare Facilities, Masoud Ghodrat Abadi, Ahoura Zandiatashbar, Aaron Pickett, Stephanie Nemet, Soheil Sharifi

Mineta Transportation Institute

Access to healthcare is a key component of public health equity, yet many U.S. communities remain dependent on private vehicles for medical travel. This study introduces an integrated framework, the Transit+Walk Score (TWS), to evaluate how effectively residents of Sacramento, California, can reach healthcare facilities via public transit and how safely, comfortably, and conveniently they can walk from transit stops to those facilities. The research aims to inform planners, transit agencies, and policy makers in designing equitable and multimodal transportation systems. The research team combined geospatial network modeling and field-based walkability audits to assess 123 healthcare facilities across Sacramento, with …

History Of The Interstate System In Indiana, Steven Wuertz

Purdue Road School

A brief history of the Interstate System in Indiana and across the Nation— 1956–2026: 70 years of the Interstate System