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 …
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), …
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 …
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 …
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 …
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 …
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 …
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.
Forecasting Commercial Vehicle Miles Traveled (Vmt) In Urban California Areas,
2024
California State University, Fresno
Forecasting Commercial Vehicle Miles Traveled (Vmt) In Urban California Areas, Steve Chung, Jaymin Kwon, Yushin Ahn
Mineta Transportation Institute
This study investigates commercial truck vehicle miles traveled (VMT) across six diverse California counties from 2000 to 2020. The counties—Imperial, Los Angeles, Riverside, San Bernardino, San Diego, and San Francisco—represent a broad spectrum of California’s demographics, economies, and landscapes. Using a rich dataset spanning demographics, economics, and pollution variables, we aim to understand the factors influencing commercial VMT. We first visually represent the geographic distribution of the counties, highlighting their unique characteristics. Linear regression models, particularly the least absolute shrinkage and selection operator (LASSO) and elastic net regressions are employed to identify key predictors of total commercial VMT. LASSO regression …
Threat And Hazard Identification And Risk Assessment (Thira) Guidance For Railroads,
2024
Mineta Transportation Institute
Threat And Hazard Identification And Risk Assessment (Thira) Guidance For Railroads, Frances L. Edwards, Daniel C. Goodrich
Mineta Transportation Institute
Climate change creates new challenges for all critical transportation infrastructure, especially for railroads with an open system that is continuously exposed to the elements. A Threat and Hazard Identification and Risk Assessment (THIRA) is a necessary first step for an organization to understand the challenges and develop strategies for adaptation to them. In many cases, the railroad sector is uniquely positioned to mitigate greenhouse gas emissions through mitigation steps. This guide will assist railroad risk managers and emergency managers to evaluate the risks and determine how best to respond to them through preparation, mitigation, or adaptation. The THIRA is the …
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 …
Path-Choice-Constrained Bus Bridging Design Under Urban Rail Transit Disruptions,
2024
Singapore Management University
Path-Choice-Constrained Bus Bridging Design Under Urban Rail Transit Disruptions, Yiyang Zhu, Jian Gang Jin, Hai Wang
Research Collection School Of Computing and Information Systems
Although urban rail transit systems play a crucial role in urban mobility, they frequently suffer from unexpected disruptions due to power loss, severe weather, equipment failure, and other factors that cause significant disruptions in passenger travel and, in turn, socioeconomic losses. To alleviate the inconvenience of affected passengers, bus bridging services are often provided when rail service has been suspended. Prior research has yielded various methodologies for effective bus bridging services; however, they are mainly based on the strong assumption that passengers must follow predetermined bus bridging routes. Less attention is paid to passengers’ path choice behaviors, which could affect …
Optimization Of Customer Service And Driver Dispatch Areas For On-Demand Food Delivery,
2024
Singapore Management University
Optimization Of Customer Service And Driver Dispatch Areas For On-Demand Food Delivery, Jingfeng Yang, Hoong Chuin Lau, Hai Wang
Research Collection School Of Computing and Information Systems
With the rapid development and popularization of mobile and wireless communication technologies, on-demand food delivery (OFD) platforms have been able to connect restaurants, customers, and drivers in real time, drastically changing dining and food delivery services. Motivated by the critical need for supply and demand management in the on-demand food delivery market, we focus on the optimization of customer service area and driver dispatch area for on-demand food delivery services. Specifically, for each restaurant, the platform needs to decide the (1) customer service area (CSA), i.e., the surrounding area within which customers can see the restaurant’s information and order food …
Karnataka Government Must Revisit Gig Workers Bill, Make It More Inclusive,
2024
National Law School of India University, Bengaluru
Karnataka Government Must Revisit Gig Workers Bill, Make It More Inclusive, Babu Mathew, Saurabh Bhattacharjee, Madhulika T
Popular Media
The Karnataka Platform-Based Gig Workers (Social Security and Welfare) Bill, 2024 has been favourably received by several commentators, but a closer inspection of the text of the Bill reveals glaring omissions, which if left unaddressed are likely to undermine the Bill’s objectives.
Transportation, Healthcare Seeking, And Outcomes,
2024
Singapore Management University
Transportation, Healthcare Seeking, And Outcomes, Xiao Lin Ong
Dissertations and Theses Collection (Open Access)
Advancements in engineering and transportation technology have integrated commuting into modern living. Most studies on transportation infrastructure, such as roads and railways, focus on economic outcomes. This paper examines an overlooked outcome of transportation connectivity: access to medical care. We study the role transportation networks play in determining patients’ treatment location choices. Specifically, we aim to study 1) why patients travel to begin with, 2) how do patients choose where to go for treatment, and 3) how travel times can affect patients’ travel decisions. To do so, we develop a dynamic discrete choice, spatial model and provide empirical estimates. We …
Tracing The Development Of Trust In Automation/Autonomy In A Multitasking Environment,
2024
Old Dominion University
Tracing The Development Of Trust In Automation/Autonomy In A Multitasking Environment, Tetsuya Sato
Psychology Theses & Dissertations
Future Advanced Air Mobility (AAM) operations will likely involve autonomous systems that exceed the capabilities of a typical automation. However, human operators could use such systems counterproductively by either misusing unreliable systems or disusing reliable systems. One determinant for inappropriate use of autonomous systems is trust. Human factors theorists proposed numerous ways to characterize trust such as the tripartite model of trust that describes the bases of trust in automation (i.e., performance, process, and purpose; Lee & See, 2004). Previous works have indicated that participants rated lower performance- and process-based trust toward the automation when the tracking task required more …
Young Driver Training And Socioeconomic Status: A Human-In-The-Loop Driving Simulator Evaluation,
2024
Old Dominion University
Young Driver Training And Socioeconomic Status: A Human-In-The-Loop Driving Simulator Evaluation, Jeffrey Edward Glassman
Psychology Theses & Dissertations
Previous research consistently shows that young drivers are poor at anticipating latent hazards on the roadway compared to more experienced drivers. The Road Awareness and Perception Training (RAPT) program is a driver training program that aims to accelerate young drivers’ learning of hazard anticipation (HA) skills. More recent research has started showing evidence that RAPT may be even more effective at reducing accidents for young drivers with a lower socioeconomic status (SES), though the direct impact of RAPT on HA skills in the driver population is yet unclear. The current experiment thus directly evaluated the effectiveness of RAPT on the …
