Artificial Intelligence For Pedestrian And Bicyclist Safety: Using Ai To Detect Near-Miss Collisions,
2024
California State University, Los Angeles
Artificial Intelligence For Pedestrian And Bicyclist Safety: Using Ai To Detect Near-Miss Collisions, Mohammad Pourhomayoun
Mineta Transportation Institute
Near-Miss Collisions are events that, with a slight change in position or timing, could have resulted in a collision, which could have caused severe injury or property damage. Understanding near-miss collisions can help identify risks and potentially improve road safety. In this project, we developed an effective end-to-end system based on advanced artificial intelligence (AI) models and computer vision algorithms to detect and report near-miss collisions as an important indicator to identify and measure safety risks, especially in specific circumstances such as a right turn on a red light. The main objective is to improve the safety of pedestrians and …
A Novel Approach To Evaluate Seatbelt Non-Compliance Of Drivers In New Jersey,
2024
Rowan University
A Novel Approach To Evaluate Seatbelt Non-Compliance Of Drivers In New Jersey, Md Arifuzzaman Nayeem
Theses and Dissertations
This study intends to investigate the non-compliant behavior of drivers with seatbelt use in New Jersey. By examining various factors such as temporal and roadway characteristics, this study seeks to identify the underlying causes of this seatbelt non-compliance behavior. To overcome the limitations of traditional methods like cross-sectional data collection, a novel approach known as moving vehicle method was employed. To gain further insights, hypothesis tests were performed across the entire dataset to pinpoint significant temporal, roadway, and geometric factors contributing to non-compliant behaviors. In the subsequent step, the association of other risky behaviors like speeding and distracted driving with …
State Transportation Policy & Funding In The Mountain West, 2023,
2024
University of Nevada, Las Vegas
State Transportation Policy & Funding In The Mountain West, 2023, Zachary Billot, Caitlin J. Saladino, William E. Brown Jr.
Transportation & Infrastructure
This fact sheet analyzes transportation policy, planning, and investment data as detailed in the report “Getting Transportation Right: Ranking the States in Light of New Federal Funding” by the National Resources Defense Council (NRDC). Five Mountain West States: Arizona, Colorado, Nevada, New Mexico, and Utah are included in this fact sheet, with data reported as of February 2023.
Investigating The Impact Of Pavement Condition On Recurring Traffic Congestion,
2024
University of Alabama at Birmingham
Investigating The Impact Of Pavement Condition On Recurring Traffic Congestion, Afrin Hossain Anni
All ETDs from UAB
Traffic congestion impacts the quality of traffic operations and transportation users’ satisfaction. In addition to adverse impacts on travel time and on-time arrivals, traffic congestion may also affect traffic safety, environmental quality, and economic development. Therefore, gaining a good understanding of congestion patterns and identify contributing factors and countermeasures to reduce them are of key importance toward effective traffic management and investment decision-making for transportation improvements. Travel demand, geometric characteristics of transportation facilities, special events, crashes, adverse weather, and other environmental conditions can play a role in the occurrence of traffic congestion. Pavement deterioration is also viewed as a factor …
Battery Electric Vehicles: Travel Characteristics Of Early Adopters,
2024
Mineta Transportation Institute
Battery Electric Vehicles: Travel Characteristics Of Early Adopters, Yunwen Feng, Jean-Daniel Saphores, Hilary Nixon, Monica Ramirez Ibarra
Mineta Transportation Institute
Do U.S. households with battery electric vehicles (BEVs) drive less or more than U.S. households with internal combustion engine vehicles (ICEVs)? Answering this question is important to policymakers and transportation planners concerned with reducing vehicle miles traveled and the emissions of greenhouse gases from transportation. So far, this question has not been answered satisfactorily, possibly because of the relatively low number of EVs in the U.S. until recently, but also because of methodological issues. In this paper, we aim to fill this gap by analyzing data from the 2017 National Household Travel Survey (NHTS). We apply propensity score matching (PSM), …
Governing Structures For Successful Regional Transit Coordination And Their Formation,
2024
San Jose State University
Governing Structures For Successful Regional Transit Coordination And Their Formation, Charles Rivasplata, Richard Lee, Michelle Derobertis, Christopher Ferrell
Mineta Transportation Institute
The expansion of metropolitan areas in California has further prompted the need to improve transportation options for all, more effectively linking origins and destinations through key enhancements to the existing network of transit services. This study provides planners and policymakers examples of effective regional transit coordination agencies. To improve multimodal connections and enhance transit services at the local and regional levels, this study explores regional coordination, focusing on entities charged with coordinating multiple transit agencies in a single metropolitan area. The study identified 16 regional transit coordinators (RTCs), identifying the structure, scope, and management of each. The results revealed that …
Understanding Travel Behavior And Accessibility For Older Adults: A Comprehensive Framework,
2024
University of Utah
Understanding Travel Behavior And Accessibility For Older Adults: A Comprehensive Framework, Andy Hong, Cathy Liu, Ja Young Kim, Zihao Wen
TREC Final Reports
This study used a mixed-method design to examine travel behavior and accessibility of older adults. The research team conducted a statewide survey and focus groups to gather travel behavior data of older adults (50+) residing in Utah. The study also employed a two-step floating catchment area method, a novel spatial technique, and integrated the survey data to accurately measure travel accessibility of older adults. Using the survey data of 724 older adults as well as the focus group interviews of 18 older individuals, we found a significant dissatisfaction and vulnerability experienced by older adults with limited mobility. The distribution patterns …
Do Pedestrian Safety Improvements Affect Older Adults' Health And Social Outcomes Equitably? A Quasi Experiment In Singapore,
2024
Singapore Management University
Do Pedestrian Safety Improvements Affect Older Adults' Health And Social Outcomes Equitably? A Quasi Experiment In Singapore, Shin Bin Tan, William Tov, Paulin Tay Straughan
Research Collection School of Social Sciences
Pedestrian-friendly neighborhoods are believed to encourage greater social participation, community engagement, and sense of social inclusion, which are important to older individuals at higher risk of being socially isolated. However, most studies on neighborhood walkability, social participation and social inclusion are cross-sectional, making it difficult to robustly establish causal links. Much research on neighborhood walkability is also based in North America and Europe, leaving a knowledge gap on the impact of walkability within other geographic contexts. Furthermore, there is a lack of empirical evidence about whether benefits from traffic calming schemes are distributed equitably. To reduce these empirical gaps, our …
Addressing Transportation Construction Workforce Needs Through Innovative Policies And Practices,
2024
California State University, Long Beach
Addressing Transportation Construction Workforce Needs Through Innovative Policies And Practices, Thomas O'Brien, Ben Olson, Devin Martinez-Flores
Mineta Transportation Institute
A 2019 survey conducted by the Associated General Contractors of America, prior to the COVID-19 pandemic, found that construction firms across the country are struggling to fill open positions. Eighty percent of survey respondents indicated they have difficulty filling jobs in occupations that are essential to highway construction. This includes heavy equipment operators, cement masons, and iron workers, among others. This workforce shortage in California will become more problematic as public agencies and their contractors seek to implement projects funded by the Bipartisan Infrastructure Law (BIL), also known as the Infrastructure Investment and Jobs Act (IIJA). In California there are …
Toward Equitable Micromobility: Lessons From Austin E-Scooter Sharing Program,
2024
Singapore Management University
Toward Equitable Micromobility: Lessons From Austin E-Scooter Sharing Program, Shunhua Bai, Junfeng Jiao
Research Collection College of Integrative Studies
This study revealed the inequitable societal impacts of E-scooters on disadvantaged populations. The study conducted a population distribution analysis to compare the use opportunities and space intrusion burdens of E-scooter sharing on four vulnerable population groups in Austin, Texas. Nearly all minority population experienced fewer E-scooter use opportunities. Ten percent of the minority population waited for a disproportionately longer time before a disturbance could be resolved. Ten percent of the low-income population were in a disadvantaged position in high opportunities and moderate burdens. Twenty percent of the physically disabled population faced more moderate-level burdens. The result did not show significant …
Scooting Through Urban Shared Micromobility Transformations: A Comprehensive Study Of Shared E-Scooter Usage Patterns, Pandemic Effects, And Equity Challenges,
2024
University of Arkansas, Fayetteville
Scooting Through Urban Shared Micromobility Transformations: A Comprehensive Study Of Shared E-Scooter Usage Patterns, Pandemic Effects, And Equity Challenges, Farzana Mehzabin Tuli
Graduate Theses and Dissertations
The rise of shared e-scooters has sparked a paradigm shift in urban transportation, offering a flexible mode of micromobility for short-distance travel. Since their US debut in September 2017, these electric scooters have gained popularity, surpassing traditional bikesharing services in many cities. This dissertation presents four studies that delve into various aspects of e-scooter adoption, from user behavior and pandemic effects to gender disparities and equitable access, providing comprehensive insights for urban mobility planning. The first study aims to determine (i) who uses shared e-scooters and why they use them, and (ii) what effects e-scooters have on the usage of …
Assessing Gtfs Accuracy,
2024
Mineta Transporation Institute
Assessing Gtfs Accuracy, Gregory L. Newmark
Mineta Transportation Institute
The promised benefits of the General Transit Feed Specification (GTFS) Schedule and Realtime standards are dependent on the underlying quality of the data. Despite this fundamental reliance, there has been relatively little research on techniques and strategies to assess GTFS accuracy. The need for such assessment is growing as federal and state governments increasingly require transit agencies to make these data available to the public. This research fills this gap by presenting a suite of methods and metrics to assess the temporal accuracy of GTFS Realtime and the spatial accuracy of GTFS Schedule feeds. The temporal assessment demonstrates an approach …
Time-To-Failure Prediction Of Fine-Grained Soil Slopes Subject To Weather-Driven Deterioration,
2024
California State University, Long Beach
Time-To-Failure Prediction Of Fine-Grained Soil Slopes Subject To Weather-Driven Deterioration, Arm M. Morsy
Mineta Transportation Institute
Embankments have been widely used in the construction of transportation and flood defense infrastructure. Embankments constructed from clays experience a suite of weather-driven deterioration processes that lead to a progressive loss of hydromechanical performance, causing potentially severe and costly consequences. This study aimed to predict the time to failure of aging, deteriorating clay embankments supporting transportation infrastructure. A multi-phase numerical modeling approach was developed to replicate the long-term, weather-driven, hydromechanical behavior of clay embankments. This model simulated the behavior of a number of well-documented embankment failure case studies that had sufficient data to derive the necessary soil properties and climate …
Ten Years Forward: An Evaluation Of California’S Active Transportation Program,
2024
San Diego State University
Ten Years Forward: An Evaluation Of California’S Active Transportation Program, Bruce Appleyard, Mario Carbajal, Madison Swayne, Nell Ahangarfabrik, Megan Honey
Mineta Transportation Institute
California’s Active Transportation Program (ATP) is a competitive, grant-based program that serves as a major funding stream for active transportation infrastructure in California. The program has six goals based on increasing nonmotorized transportation, safety, equity, sustainability, and health. Evaluation of the ATP’s administrative and scoring processes is crucial to ensure goals are met as equitably and efficiently as possible. Additionally, establishing a methodology for evaluating the safety impacts of active transportation projects is critically important. Through a series of interviews and an extensive review of the documents and rubrics of the program, this report discusses how the Active Transportation Program …
Is Parking Cash-Out Worth It? Comparing Cost-Effectiveness And Climate And Equity Benefits In The Bay Area And South Coast Air Quality Management Districts,
2024
California State University, Dominguez Hills
Is Parking Cash-Out Worth It? Comparing Cost-Effectiveness And Climate And Equity Benefits In The Bay Area And South Coast Air Quality Management Districts, Fynnwin Prager, Tianjun Lu, Ashley Membere, Parveen Chhetri
Mineta Transportation Institute
This research explores the potential impacts of California parking cash-out policy changes on the Bay Area and LA County. Parking cash-out—a California law since 1992—requires that certain qualifying employers who subsidize employee parking offer employees the option to give up their parking space and receive cash instead. Studies show parking cash-out substantially reduces VMT and emissions, yet enforcement remains voluntary. Current policy covers few firms (<1%) and employees (around 11%) in the study regions. Policy reform to include companies with 20+ employees could increase this to 18%. Our experimental-design survey (n=963) explores behavioral changes in response to multiple policy variables and finds that 76.9% of employees would accept cash-out if offered, and that participants who had to pay the market rate for parking and were full-time commuters were more likely to switch to using public transportation at lower cash minimums. VMT related to employees covered by parking cash-out are substantial (5.6 million in the Bay Area; 5.7 million in LA County), and account for a combined 6,593 daily tons of GHG. As even limited adoption could have significant environmental benefits, parking cash-out would be a more cost-effective approach to reducing VMT than traditional TDM programs such as trip-reduction programs, workplace parking taxation, or transit subsidies and road diets, though further evidence on the direct influence of parking cash-out on commuter behavior is needed.
Enabling Sustainable Freight Forwarding Network Via Collaborative Games,
2024
Singapore Management University
Enabling Sustainable Freight Forwarding Network Via Collaborative Games, Pang Jin Tan, Shih-Fen Cheng, Richard Chen
Research Collection School Of Computing and Information Systems
Freight forwarding plays a crucial role in facilitating global trade and logistics. However, as the freight forwarding market is extremely fragmented, freight forwarders often face the issue of not being able to fill the available shipping capacity. This recurrent issue motivates the creation of various freight forwarding networks that aim at exchanging capacities and demands so that the resource utilization of individual freight forwarders can be maximized. In this paper, we focus on how to design such a collaborative network based on collaborative game theory, with the Shapley value representing a fair scheme for profit sharing. Noting that the exact …
Assessing The Impacts Of Cavs On A Coordinated Signalized Corridor,
2024
Boise State University
Assessing The Impacts Of Cavs On A Coordinated Signalized Corridor, Ty David Mills
Boise State University Theses and Dissertations
Connected Automated vehicles (CAVs) are growing in popularity and could have potential implications on the transportation system. The effects of CAVs have yet to be fully realized because of the newness of the technology. Anticipated effects include increased capacity, faster travel time, improved level of service, increased safety, and overall effectiveness of the transportation system. The Highway Capacity Manual (HCM) published by the Transportation Research Board of the National Academies has incorporated some of these impacts by developing capacity adjustment factors (CAFs) for various scenarios for freeway segments, signalized intersections, and roundabouts. This study builds upon the HCM study of …
Anopas: Practical Anonymous Transit Pass From Group Signatures With Time-Bound Keys,
2024
Singapore Management University
Anopas: Practical Anonymous Transit Pass From Group Signatures With Time-Bound Keys, Rui Shi, Yang Yang, Yingjiu Li, Huamin Feng, Hwee Hwa Pang, Robert H. Deng
Research Collection School Of Computing and Information Systems
An anonymous transit pass system allows passengers to access transport services within fixed time periods, with their privileges automatically deactivating upon time expiration. Although existing transit pass systems are deployable on powerful devices like PCs, their adaptation to more user-friendly devices, such as mobile phones with smart cards, is inefficient due to their reliance on heavy-weight operations like bilinear maps. In this paper, we introduce an innovative anonymous transit pass system, dubbed Anopas, optimized for deployment on mobile phones with smart cards, where the smart card is responsible for crucial lightweight operations and the mobile phone handles key-independent and time-consuming …
Segac: Sample Efficient Generalized Actor Critic For The Stochastic On-Time Arrival Problem,
2024
Sichuan University
Segac: Sample Efficient Generalized Actor Critic For The Stochastic On-Time Arrival Problem, Honglian Guo, Zhi He, Wenda Sheng, Zhiguang Cao, Yingjie Zhou, Weinan Gao
Research Collection School Of Computing and Information Systems
This paper studies the problem in transportation networks and introduces a novel reinforcement learning-based algorithm, namely. Different from almost all canonical sota solutions, which are usually computationally expensive and lack generalizability to unforeseen destination nodes, segac offers the following appealing characteristics. segac updates the ego vehicle’s navigation policy in a sample efficient manner, reduces the variance of both value network and policy network during training, and is automatically adaptive to new destinations. Furthermore, the pre-trained segac policy network enables its real-time decision-making ability within seconds, outperforming state-of-the-art sota algorithms in simulations across various transportation networks. We also successfully deploy segac …
Moving Towards The Electrification Of Medium- And Heavy-Duty Vehicles In The Inland Empire,
2024
California State University - San Bernardino
Moving Towards The Electrification Of Medium- And Heavy-Duty Vehicles In The Inland Empire, Kimberly Collins, Raffi Der Wartanian, Francisca Beer, Yunfei Hou
Mineta Transportation Institute
This report investigates the transition to zero-emission medium- and heavy-duty vehicles (MDHD) within California’s Inland Empire (IE), emphasizing the significance of electric vehicle charging infrastructure and opportunity charging strategies in facilitating sustainable transportation. Utilizing a mixed-methods approach that combines a systematic literature review, geospatial and big data analytics, and thematic analysis of expert interviews, the study explores the multifaceted challenges and opportunities of electrification. The literature review assesses policies at various governance levels, while geospatial analysis identifies regional traffic patterns and infrastructure needs. Big data analytics examine vehicle movements, complemented by insights from interviews with 16 regional experts, offering a …
