Transportation Commons^™

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, …

Assessing The Perceived Safety Of Cyclists With Virtual Reality, Vahid Balali

Mineta Transportation Institute

In 2022, 7,522 pedestrians and 1,084 bicyclists were killed and approximately 67,000 pedestrians and 46,195 bicyclists injured in motor vehicle crashes on public roadways in the United States, according to the Insurance Institute for Highway Safety (IIHS). The transportation industry is faced with a pressing need to bolster the safety of these vulnerable road users. This research develops models of design and environmental factors that influence bicyclists’ and pedestrians’ perception of safety using Virtual Reality (VR) technology and ultimately informs transportation infrastructure design to better accommodate nonmotorized travelers. The goal of the bicycle element of this research is to develop …

Modernizing Railroad Crossings In Gettysburg, Paul Zaim

CAFE Symposium 2025

This project is an investigation of the current state of railroad crossings in the Borough of Gettysburg, including the physical state and shortcomings of each grade crossing. In addition, the project includes a proposal to improve the safety rating of the crossings through a legislative and traffic analysis, including the feasibility of implementing a “Quiet Zone” in the borough complete with an estimated cost breakdown.

Understanding The Prevalence Of Mental Health And Behavioral Distress In Transit Assaults And Presenting Targeted Response And Mitigation Methods To Reduce Victimization Trends, Kathleen Moore, Emilie Ellenberg, Melissa Carlson, Jodi Godfrey, Lisa Staes

Mineta Transportation Institute

This research project was performed to better understand the prevalence of mental health and behavioral distress in transit assaults and present corresponding targeted response and mitigation methods to reduce victimization trends. It includes a literature review, a data presentation and overview of reported public transit assault-related events, an examination of the contributing factors to those events, and documentation of 10 transit agency case studies. The literature review discusses some of the misconceptions of mental illness and associated stigmas and discrimination that can occur in response to these misconceptions. It discusses various approaches and strategies that transit agencies have used to …

Misconduct On Public Transit: An Exploratory Analysis Using The Comments Formerly Known As Tweets, Egbe Etu Etu, Asha Weinstein Agrawal, Imokhai Tenebe, Jordan Larot, Dang Minh Nhu Nguyen

Mineta Transportation Institute

This project developed a simple methodology for using Twitter data to explore public perceptions about misconduct on public transit in California. The methodology allows future researchers to analyze tweets to answer questions such as: How frequent are tweets related to assault, abuse, or other misconduct on public transit? What concerns arise most frequently? What are the types of behaviors discussed? We collected and analyzed data from Twitter posts in California about various types of public transit misconduct from January 2020 to March 2023 to identify the nature and frequency of reported misconduct. Our findings reveal that harassment, uncivil behavior, and …

Traffic-Related Pedestrian Deaths In The Mountain West, 2022, Miguel Soriano Ralston, Caitlin J. Saladino, William E. Brown Jr.

Transportation & Infrastructure

This fact sheet examines data from Smarth Growth America’s report, “Dangerous By Design, 2022,” which reports on traffic deaths throughout the United States. This fact sheet highlights pedestrian deaths as well as deaths among specific groups based on age, race, ethnicity, and media household income between 2016 and 2020 in the Mountain West: Arizona, Colorado, Nevada, New Mexico, and Utah. This fact sheet builds upon a 2020 fact sheet, titled “Traffic-Related Pedestrian Deaths in the Sun Belt Region,” which examined Smart Growth America’s assessment of pedestrian safety for the years 2008 to 2017.

Economic Evaluation Of Route Choice Characteristics For Company Truck Drivers And Owner-Operator Truck Drivers In Southern California Freeways, Joseph J. Kim, Jose Alejandro Arroyo Turcios

Mineta Transportation Institute

To contribute to the understanding of freeway capacity and financing options, this study evaluates the demand for truck-only toll lanes on Southern California freeways. The study implemented surveys to both company truck drivers and owner-operator truck drivers to estimate the value they place on time, reliability, and safety measures. The research team met face-to-face with both types of truck drivers near the Ports of Los Angeles and Long Beach to understand the drivers’ perspectives regarding truck-only toll lanes on Southern California freeways. A data set containing 45 surveys out of 62 survey responses were used for statistical analysis. The results …

Effect Of Weather Events On Travel Time Reliability And Crash Occurrence, Sonu Mathew, Srinivas S. Pulugurtha

Mineta Transportation Institute

The magnitude of the effect of adverse weather conditions on road operational performance varies with the type of weather condition and the road characteristics of the road links and adjacent links. Therefore, the relationship between weather and traffic is always a concern to traffic engineers and planners, and they have extensively explored ways to integrate weather information into transportation systems. Understanding the influence of weather on operational performance and safety helps traffic engineers and planners to proactively plan and manage transportation systems. The main objective of this research is to evaluate the effect of adverse weather conditions on travel time …

Connected Simulation For Work Zone Safety Application, Vahid Balali

Mineta Transportation Institute

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 an immersive hyper-realistic …

Safety Considerations For All Road Users On Edge Lane Roads, Michael Williams, Marcial Lamera, Aleksander Bauranov, Carole Voulgaris, Anurag Pande

Mineta Transportation Institute

Edge lane roads (ELRs), also known as advisory bike lanes or advisory shoulders, are a type of shared street where two-way motor vehicle (MV) traffic shares a single center lane, and edge lanes on either side are preferentially reserved for vulnerable road users (VRUs). This work comprises a literature review, an investigation of ELRs’ operational characteristics and potential road user interactions via simulation, and a study of crash data from existing American and Australian ELRs.

The simulation evaluated the impact of various factors (e.g., speed, volume, directional split, etc.) on ELR operation. Results lay the foundation for a siting criterion. …

Evaluating Financing Mechanisms And Economic Benefits To Fund Grade Separation Projects, Shailesh Chandra, Mehran Rahmani, Timothy Thai, Vivek Mishra, Jacqueline Camacho

Mineta Transportation Institute

Investment in transportation infrastructure projects generates benefits, both direct and indirect. While emissions reductions, crash reductions, and travel time savings are prominent direct benefits, there are indirect benefits in the form of real estate enhancements that could pay off debt or loan incurred in the improvement of the infrastructure itself. Studies have shown that improvements associated with rail transportation (such as station upgrades) trigger an increase in the surrounding real estate values, increasing both the opportunity for monetary gains and, ultimately, property tax collections. There is plenty of available guidance that provides blueprints for benefits calculations for operational improvements in …

Freight Demand Model For Southern California Freeways With Owner–Operator Truck Drivers, Joseph J. Kim, Samuel Dominguez, Luis Diaz

Mineta Transportation Institute

This study evaluates the demand for truck-only toll lanes on Southern California freeways with owner–operator truck drivers. The study implemented the stated preference survey method to estimate the value placed by drivers on time, reliability, and safety measures using various scenarios geared towards assessing those values. The project team met face-to-face with owner- operator truck drivers near the Ports of Los Angeles and Long Beach to understand the drivers’ perspectives regarding truck-only toll lanes on Southern California freeways. A data set containing 31 survey responses is obtained and used for statistical data analysis using analysis of variable (ANOVA) and two …

A Micro-Scale Analysis Of Cycling Demand, Safety, And Network Quality, Sherry Ryan, Ana Garate, Diane Foote

Mineta Transportation Institute

This research uses a unique database of cycling volumes from the San Diego region to estimate cycling demand and cycling collision models. Continuous cycling count data collected from 34 automated counters are used to extrapolate over 1,400 short duration counts to average annual daily bicycle volumes (AADB). Network characteristics, built environment, and socio-economic characteristics are primary independent variables employed in the modeling. A key contribution of this research is to incorporate both a whole-network measure (betweenness centrality) and a network quality measure (LTS) in estimating cycling volumes. This research also improves upon cycling risk assessment by using more rigorous exposure …

Is The Transit Industry Prepared For The Cyber Revolution? Policy Recommendations To Enhance Surface Transit Cyber Preparedness, Scott Belcher, Terri Belcher, Eric Greenwald, Brandon Thomas

Mineta Transportation Institute

The intent of this study is to assess the readiness, resourcing, and structure of public transit agencies to identify, protect from, detect, respond to, and recover from cybersecurity vulnerabilities and threats. Given the multitude of connected devices already in use by the transit industry and the vast amount of data generated (with more coming online soon), the transit industry is vulnerable to malicious cyber-attack and other cybersecurity-related threats. This study reviews the state of best cybersecurity practices in public surface transit; outlines U.S. public surface transit operators’ cybersecurity operations; assesses U.S. policy on cybersecurity in public surface transportation; and provides …

Walk N’ Roll (Wnr) San Jose: An Initiative To Promote Active Transportation And Safe Routes To School For Children In San Jose, California, François Xavier Hans Voltaire

Master's Projects

How effective is the Walk n’ Roll (WnR) program in promoting active transportation near school zones in San Jose, California? The intent of this research question is to discern the effect of the City of San Jose’s WnR program in encouraging children to actively travel to school (walking/cycling) and using other means such as scooters and skateboards. This research will use data from 2012-2018 to measure the efficacy of the program. This project strives to discover whether the tools and strategies that the program is using impact the augmentation level of the number of students who actively travel and transport …

Active Transportation And Health Effects Of Safe Routes To Schools (Sr2s) Projects And Planning, Christopher E. Ferrell

Mineta Transportation Institute

On July 29, 2005 Congress passed the Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU), the federal government’s transportation bill, in part, designating $612 million over five years to go to a relatively new funding program: Safe Routes to School (SR2S). The legislation mandated that state departments of transportation (DOTs) receive annual funding in an amount proportional to the number of primary and middle school grade children enrolled in their states. State DOTs could then grant that money to state, local, and regional agencies, as well as non-profit organizations to fund SR2S programs.

Improving public health …

The Effects Of Gateway Width On Driver Yielding To Pedestrians: A Systematic And Parametric Analysis, Jonathan M. Hochmuth

Masters Theses

The gateway in-street sign treatment has been demonstrated to be a cost-effective method for increasing driver yielding behavior at crosswalks. In the present study, wide and narrow gateway widths were compared at two sites to determine if there was a differential effect on driver yielding behavior. Then, the relationship between width and yielding was refined with a parametric analysis at one of these sites. Gateway width was varied in two-foot intervals from 12ft to 18ft. The results indicated an inverse relationship between gateway width and driver yielding behavior. There are likely two variables related to this effect. First, because drivers …

Holding Ridesharing Companies Accountable In Texas, Martha Alejandra Salas

St. Mary's Law Journal

Abstract forthcoming

Relationship Between Airline Category, Geographical Region, And Safety Performance, Peter Simpson

Walden Dissertations and Doctoral Studies

Passengers rank safety as a key factor in airline choice. Thus, safety performance impacts an airline's ability to attract customers. The purpose of this correlational study was to examine the relationship and difference between airline category low-cost carriers (LCCs) and full-service carriers (FSCs), geographical region, and safety performance measured by accident rates. The target population comprised all airlines in all countries that had an accident during the 14-year period 2004 to 2017. Data consisted of archival data of all global airline accidents and airline departure frequencies for the 14-year period. The theory of organizational accidents in complex sociotechnical systems explains …

Engineering Standards In Highway Design Litigation, Michael Lewyn

Scholarly Works

Highway engineers sometimes believe that if they redesign streets to improve pedestrian safety (for example, by introducing traffic calming techniques) they might be successfully sued for negligent design by motorists. This chapter suggests that in such situations, governments are likely to be protected by discretionary function immunity. In addition, the chapter discusses a variety of technical issues.

Massachusetts Urban Bicycle Preparedness, Rick L. Sheiber

Instructional Design Capstones Collection

Since 2007, Boston has made tremendous strides in shedding its designation by Bicycling Magazine as one of the “Worst Biking Cities” (Zezima, 2009, p. A12) by designating over 92 miles of bike lanes throughout the city and introducing bicycle initiatives like Boston Bikes, the Hubway bicycle sharing program. These efforts have resulted in a dramatic rise in the number of cyclists in Greater Boston and a decrease in accidents involving bicycles ((Pedroso, Angriman, Bellows & Taylor, 2016). While the quantitative research has been primarily positive, a 2017 survey initiated LivableStreets and the Longwood Area Cyclists of commuters in the Longwood …

Evaluation Of Red Rrfb Implementation At Freeway Off-Ramps And Its Effectiveness On Alleviating Wrong-Way Driving, Seckin Ozkul, Pei-Sung Lin

CUTR Faculty Journal Publications

Wrong-way crashes are a major cause for safety concern along freeways and limited access facilities. This study investigated three different aspects of the use of Rectangular Rapid Flashing Beacons (RRFBs): 1) different settings of red RRFBs and their perceived effectiveness on reducing wrong-way driving based on a public opinion survey, 2) the effect of active red RRFBs on the behavior of drivers traveling on adjacent roadways via a before-and-after study, and 3) the effectiveness of red RRFBs on alleviating wrong-way driving on freeway off-ramps by analyzing the percentage of vehicles turning back after observing the red RRFB activation. Based on …

Bikesharing And Bicycle Safety, Elliot Martin, Adam Cohen, Jan L. Botha, Susan Shaheen

Mineta Transportation Institute

The growth of bikesharing in the United States has had a transformative impact on urban transportation. Major cities have established large bikesharing systems, including Boston, Chicago, Denver, Minneapolis-Saint Paul, New York City, Salt Lake City, the San Francisco Bay Area, Seattle, Washington DC, and others. These systems began operating as early as 2010, and no fatalities have occurred within the US as of this writing. However, three have happened in North America—two in Canada and one in Mexico. Bikesharing has some qualities that appear inherently unsafe for bicyclists. Most prominently, helmet usage is documented to be quite low in most …

Pilot Perceptions On Impact Of Crew Rest Regulations On Safety And Fatigue, Lukas Rudari, Mary E. Johnson, Robert C. Geske, Lauren A. Sperlak

International Journal of Aviation, Aeronautics, and Aerospace

The risk of fatigue on pilot performance and safety is well recognized in aviation. In response to increased safety concerns, the Federal Aviation Administration addressed fatigue risk for passenger airline pilots in Title 14 Code of Federal Regulations Part 117, which included accommodations to address fatigue related risk-factors such as circadian rhythm and the phenomenon commonly described as jet-lag. The rule became effective in January 2014. A survey was conducted in March and April of 2014 to better understand pilot perceptions of the new Part 117 rule. This study analyzed survey responses from 92 self-identified pilots to determine the effect …

Impact Of Optimally Minimizing Delay Times On Safety At Signalized Intersections In Urban Areas, Case Study: The City Of Virginia Beach, Eugene Vida Maina, Albert Forde, R. Michael Robinson

VMASC Publications

Optimally minimizing delay times at signalized intersections can significantly improve both traffic flow and safety. However, most traffic flow optimizing tools do not measure the effect on safety. This study uses nonlinear programming (NLP) algorithms to optimally minimize delay times and employs both Safety performance functions (SPFs) and empirical Bayes (EB) before-after methodology to measure the impact on safety presented as a Crash Modification Factor (CMF). A crash modification factor (CMF) is a multiplicative factor used by transportation practitioners to compute the expected number of crashes at specific study site(s) after a countermeasure has been proposed or is implemented. Using …

The Efficacy Of Aircraft Type Club Safety, William Jeffrey "Jeff" Edwards

Journal of Aviation Technology and Engineering

The FAA and industry are attempting to make significant improvements in general aviation (GA) safety through voluntary measures largely carried out by grassroots aviation organizations, such as aircraft type clubs. While aircraft type clubs are principally focused on safety and education efforts, little is known about the efficacy of their voluntary measures. Research is lacking with respect to understanding whether or not voluntary measures contribute to GA safety. This mixed methods research quantifies the accident data of three aircraft type clubs and compares the safety of their members to nonmembers. A qualitative examination reveals why type club members may have …

A Framework For Developing And Integrating Effective Routing Strategies Within The Emergency Management Decision-Support System, Research Report 11-12, Anurag Pande, Frances Edwards, Joseph Yu

Mineta Transportation Institute

This report describes the modeling, calibration, and validation of a VISSIM traffic-flow simulation of the San José, California, downtown network and examines various evacuation scenarios and first-responder routings to assess strategies that would be effective in the event of a no-notice disaster. The modeled network required a large amount of data on network geometry, signal timings, signal coordination schemes, and turning-movement volumes. Turning-movement counts at intersections were used to validate the network with the empirical formula-based measure known as the GEH statistic. Once the base network was tested and validated, various scenarios were modeled to estimate evacuation and emergency vehicle …

Pedestrian And Bicycle Safety On A College Campus: Crash And Conflict Analyses With Recommended Design Alternatives For Clemson University, Gabe Dobbs

All Theses

The primary goal of this study is to investigate pedestrian and bicycle safety qualitatively and quantitatively on the campus of Clemson University and to provide recommendations for safety improvement based on these analyses. Because of heavy pedestrian and bicycle volumes, the well-being of these users is critical to the overall safety culture of a university. The analysis of crashes, pedestrian-vehicle conflict data, vehicular speeds and volumes, and crosswalk facility characteristics on Clemson's campus enabled the development of a prioritization scheme for the selection of pedestrian crossing sites for design improvement. These data components were utilized in verifying the validity of …

California Transportation Security Summits, Mti Report S-01-04, Mti

Mineta Transportation Institute

In the aftermath of September 11, it became undeniably clear that terrorists target civil transport systems and are willing to use transport systems as weapons of mass destruction as well as targets. In response to this threat, America ’s transportation community must adopt more effective measures to insure the safety of the millions of passengers and employees who use or work in transit facilities every day. To meet this heightened responsibility, leaders of the transportation community need high-quality information and appropriate policy guidance. To help meet this need, the Mineta Transportation Institute (MTI)—a leader in transportation terrorism research since the …

Protecting Public Surface Transportation Against Terrorism And Serious Crime: Continuing Research On Best Security Practices, Mti Report 01-07, Brian M. Jenkins

Mineta Transportation Institute

Terrorist attacks on commercial aviation had declined significantly after reaching a high point in the 1970s. The devastating consequences of the four coordinated hijackings and deliberate crashes of three of the planes into the World Trade Center in New York and the Pentagon in Washington, D.C., on September 11, 2001—an event unprecedented in the annals of terrorism—have wiped out all sense of progress and focused national attention on aviation security. Meanwhile, terrorists have continued to attack public surface transportation worldwide with no indication of abatement in these attacks.1 With large-scale indiscriminate violence clearly the reality of contemporary terrorism and growing …