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Mineta Transportation Institute Publications

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Full-Text Articles in Social and Behavioral Sciences

How Will California’S Electric Vehicle Policy Impact State-Generated Transportation Revenues? Projecting Scenarios Through 2040, Asha Weinstein Agrawal, Hannah King, H. A. “Burt” Tasaico Mar 2024

How Will California’S Electric Vehicle Policy Impact State-Generated Transportation Revenues? Projecting Scenarios Through 2040, Asha Weinstein Agrawal, Hannah King, H. A. “Burt” Tasaico

Mineta Transportation Institute Publications

California faces unprecedented uncertainty about how much revenue the state will raise from a package of taxes on motor fuels and annual registration fees on light-duty vehicles that was established in 2017 by Senate Bill 1 (SB 1). The SB 1 taxes are by far the largest source of revenue that the State of California generates to support maintenance, operations, and improvements for state highways, and the funds also contribute substantially to local transportation and public transit budgets. To help policymakers navigate the uncertainty about future SB 1 transportation revenue, this study used spreadsheet models to project revenue from the …

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The Transportation Sector, Cap-And-Trade And Blockchain: A Carbon Credit Trading Platform, Aditya Mankar, Forouzan Golshani Mar 2024

The Transportation Sector, Cap-And-Trade And Blockchain: A Carbon Credit Trading Platform, Aditya Mankar, Forouzan Golshani

Mineta Transportation Institute Publications

This study offers a solution that facilitates direct trading of carbon credits with no intermediaries by using blockchain technology aligned with the cap-and-trade system. With this solution, along with other major transformations in the industry, the transportation sector can take more ownership of emissions and mitigate the impact of its role as the largest contributor of greenhouse gasses. The solution sits at the confluence of the Cap-and-Trade initiative, carbon credit trading, and blockchain technology. Although the concept of blockchains has been the subject of significant curiosity, scrutiny, boosterism, investment, criticism, it most importantly is at the core of useful, rapidly …

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Investigating The Effects Of Alcohol Consumption On Manual And Automated Driving: A Systematic Review, Miaomiao Dong, Yuni Lee, Jackie Cha, Gaojian Huang Feb 2024

Investigating The Effects Of Alcohol Consumption On Manual And Automated Driving: A Systematic Review, Miaomiao Dong, Yuni Lee, Jackie Cha, Gaojian Huang

Mineta Transportation Institute Publications

There are direct correlations between drunk driving and car-related injuries, disabilities, and death. Autonomous vehicles (AVs) may provide useful driver support systems to prevent or reduce road accidents. However, AVs are not yet fully automated and require human drivers to take over the vehicle at times. Therefore, understanding how alcohol affects driving performance in both manual and automated driving is important because manual drives may offer insights into the takeover process in AVs. A systematic review of 53 articles from eight databases was conducted. Findings were categorized based on the human information processing model, which can be extended to the …

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Beneath I-280: Excavating A Neighborhood Lost To San José Freeways, Leila Ullmann, Gordon Douglas Feb 2024

Beneath I-280: Excavating A Neighborhood Lost To San José Freeways, Leila Ullmann, Gordon Douglas

Mineta Transportation Institute Publications

Throughout the 1960s and 1970s, thousands of people in San José, California were displaced from their homes as the state used eminent domain to purchase land and uproot neighborhoods for the construction of Interstate freeways. This report presents a multifaceted research and public knowledge effort that uncovers some of the communities buried beneath these freeways, in the area where I-280 and CA-87 meet today near downtown San José. The project builds primarily from previously unprocessed California Department of Transportation (CalTrans) archival documents, which this project studies for the first time. The records are rich in detail about valuation and sale …

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A Practical Framework For Component-Level Structural Health Monitoring Of The Gerald Desmond Bridge, Mehran Rahmani, Vesna Terzic, Andrea Calabrese, Brittany Cambell Jan 2024

A Practical Framework For Component-Level Structural Health Monitoring Of The Gerald Desmond Bridge, Mehran Rahmani, Vesna Terzic, Andrea Calabrese, Brittany Cambell

Mineta Transportation Institute Publications

Bridges serve as critical transportation infrastructure, but traditional maintenance inspection to ensure their safety is time-consuming, costly, and labor-intensive, especially for larger and more complex structures. This study presents a practical framework for the instrumentation, data acquisition, and remote condition assessment of the Gerald Desmond Bridge, California’s largest cable-stayed bridge. The framework aims to establish a foundation for real-time or near real-time remote health monitoring of the bridge’s critical elements. The study highlights the advantages of remote monitoring in terms of efficiency, cost-effectiveness, and early detection of damage.

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Autonomous Shuttle Implementation And Best Practices, Dil Samina Diba, Ninad Gore, Srinivas S. Pulugurtha Dec 2023

Autonomous Shuttle Implementation And Best Practices, Dil Samina Diba, Ninad Gore, Srinivas S. Pulugurtha

Mineta Transportation Institute Publications

When, where, and how autonomous shuttles are deployed can have significant safety, economic, and policy impacts on their operation and performance. This research analyzes data related to 120 existing deployments of autonomous shuttles, looking at safety, operational, economic, and policy-related issues. Analysis shows that autonomous shuttles would be an excellent supplement to public transportation. However, improvements to the vehicle and the infrastructure are needed before any permanent deployment. The study also analyzes the perceptions of practitioners, industry experts, and transportation system users toward autonomous shuttles. Principal Component Analysis (PCA) and Multiple Input Multiple Cause Structural Equation Modelling (SEM) approaches were …

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Understanding The Effect Of Pervasive Events On Vehicle Travel Time Patterns, Chirag Akbari, Ninad Gore, Srinivas S. Pulugurtha Dec 2023

Understanding The Effect Of Pervasive Events On Vehicle Travel Time Patterns, Chirag Akbari, Ninad Gore, Srinivas S. Pulugurtha

Mineta Transportation Institute Publications

The COVID-19 pandemic has disrupted daily activities and travel patterns, affecting personal and commercial trips. This study investigates the effect of different stages of the pandemic on travel time patterns. Eighty-six geographically distributed links (sections of road) in Mecklenburg County and Buncombe County, North Carolina, were selected for analysis. The selected links accounted for the variation in road geometry, land use, and speed limit. Travel time data for three years (i.e., 2019, 2020, and 2021) were extracted from a private data source at 5-min intervals. Travel time reliability (TTR) and travel time variability (TTV) are estimated for different phases of …

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Evaluating Benefits From Transportation Investments Aligned With The Climate Action Plan For Transportation Infrastructure (Capti), Serena Alexander, Shams Tanvir, T. William Lester Dec 2023

Evaluating Benefits From Transportation Investments Aligned With The Climate Action Plan For Transportation Infrastructure (Capti), Serena Alexander, Shams Tanvir, T. William Lester

Mineta Transportation Institute Publications

Building upon two executive orders targeting the mitigation of greenhouse gas (GHG) emissions in California, the Climate Action Plan for Transportation Infrastructure (CAPTI) offers a comprehensive plan to work toward a more unified vision for transportation that prioritizes climate, health, and social equity. The purpose of this project was to help evaluate the benefits from transportation investments across the State of California. With support from Caltrans, the research team provided a holistic evaluation framework that involved an analysis of vehicle miles traveled (VMT) and emissions impacts, an economic impact analysis, and an equity analysis of transportation investments in California. Findings …

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Should State Land In Southern California Be Allocated To Warehousing Goods Or Housing People? Analyzing Transportation, Climate, And Unintended Consequences Of Supply Chain Solutions, Tianjun Lu, Jian-Yu Ke, Azure Fisher, Mahmoud Salari, Patricia Valladolid, Fynnwin Prager Dec 2023

Should State Land In Southern California Be Allocated To Warehousing Goods Or Housing People? Analyzing Transportation, Climate, And Unintended Consequences Of Supply Chain Solutions, Tianjun Lu, Jian-Yu Ke, Azure Fisher, Mahmoud Salari, Patricia Valladolid, Fynnwin Prager

Mineta Transportation Institute Publications

In response to COVID-19 pandemic supply chain issues, the State of California issued Executive Order (EO) N-19-21 to use state land to increase warehousing capacity. This highlights a land-use paradox between economic and environmental goals: adding warehouse capacity increases climate pollution and traffic congestion around the ports and warehouses, while there is a deficit of affordable housing and high homeless rates in port-adjacent underserved communities. This study aims to inform regional policymakers and community stakeholders about these trade-offs by identifying current and future supply of and demand for warehousing and housing in Southern California through 2040. The study uses statistical …

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Learning About Street Harassment On Transit: A Survey Instrument For Transit Agencies, Asha Weinstein Agrawal, Jon Canapary, Carol Anne Caroll, Tam J. Guy, Anastasia Loukaitou-Sideris Dec 2023

Learning About Street Harassment On Transit: A Survey Instrument For Transit Agencies, Asha Weinstein Agrawal, Jon Canapary, Carol Anne Caroll, Tam J. Guy, Anastasia Loukaitou-Sideris

Mineta Transportation Institute Publications

This study was conducted in accordance with California Senate Bill 1161 (2022), legislation that directed the Mineta Transportation Institute to develop a reliable, easy-to-use survey instrument for collecting information from public transit passengers about the extent, location, and characteristics of any street harassment they experience. Although the legislation is focused on large California transit agencies, the study findings are equally relevant to smaller agencies and agencies outside the state. To develop the recommended questionnaire, we reviewed literature about street harassment, analyzed transit passenger surveys to explore the questions asked about safety and harassment, received feedback on iterative drafts of the …

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Exploring Traffic Speed Patterns For The Implementation Of Variable Speed Limit (Vsl) Signs, Panick Kalambay, Srinivas Pulugurtha Dec 2023

Exploring Traffic Speed Patterns For The Implementation Of Variable Speed Limit (Vsl) Signs, Panick Kalambay, Srinivas Pulugurtha

Mineta Transportation Institute Publications

Traffic congestion is a prevalent issue during peak travel hours on roads in the United States. This study focuses on identifying suitable road links in Charlotte, North Carolina, for implementing variable speed limit (VSL) signs. Real-world traffic speed data collected over one year was analyzed to identify specific road links with favorable characteristics for VSL sign installations. The analysis considered weekdays, weekends, and specific times of the day to capture variations in speed patterns. The results revealed that roads with lower speed limits consistently experienced speeds exceeding the posted speed limits, suggesting additional enforcement or safety measures. For roads with …

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Cycling Past 50: A Closer Look Into The World Of Older Cyclists, Year 4 Survey, Carol Kachadoorian Dec 2023

Cycling Past 50: A Closer Look Into The World Of Older Cyclists, Year 4 Survey, Carol Kachadoorian

Mineta Transportation Institute Publications

This document reports on approximately 5,000 responses to a North American survey of older adults who cycle. The survey, open from August 2021 through March 2022, 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. The …

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Influence Of Pavement Conditions On Commercial Motor Vehicle Crashes, Stephen Arhin, Babin Manandhar, Adam Gatiba Dec 2023

Influence Of Pavement Conditions On Commercial Motor Vehicle Crashes, Stephen Arhin, Babin Manandhar, Adam Gatiba

Mineta Transportation Institute Publications

Commercial motor vehicle (CMV) safety is a major concern in the United States, including the District of Columbia (DC), where CMVs make up 15% of traffic. This research uses a comprehensive approach, combining statistical analysis and machine learning techniques, to investigate the impact of road pavement conditions on CMV accidents. The study integrates traffic crash data from the Traffic Accident Reporting and Analysis Systems Version 2.0 (TARAS2) database with pavement condition data provided by the District Department of Transportation (DDOT). Data spanning from 2016 to 2020 was collected and analyzed, focusing on CMV routes in DC. The analysis employs binary …

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Deep Learning, Machine Learning, Or Statistical Models For Weather-Related Crash Severity Prediction, Abimbola Ogungbire, Panick Kalambay, Hardik Gajera, Srinivas S. Pulugurtha Dec 2023

Deep Learning, Machine Learning, Or Statistical Models For Weather-Related Crash Severity Prediction, Abimbola Ogungbire, Panick Kalambay, Hardik Gajera, Srinivas S. Pulugurtha

Mineta Transportation Institute Publications

Nearly 5,000 people are killed and more than 418,000 are injured in weather-related traffic incidents each year. Assessments of the effectiveness of statistical models applied to crash severity prediction compared to machine learning (ML) and deep learning techniques (DL) help researchers and practitioners know what models are most effective under specific conditions. Given the class imbalance in crash data, the synthetic minority over-sampling technique for nominal (SMOTE-N) data was employed to generate synthetic samples for the minority class. The ordered logit model (OLM) and the ordered probit model (OPM) were evaluated as statistical models, while random forest (RF) and XGBoost …

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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 Nov 2023

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 Publications

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 …

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What Do Americans Think About Federal Tax Options To Support Transportation? Results From Year Fourteen Of A National Survey, Asha Weinstein Agrawal, Hilary Nixon, Adam Azevedo Nov 2023

What Do Americans Think About Federal Tax Options To Support Transportation? Results From Year Fourteen Of A National Survey, Asha Weinstein Agrawal, Hilary Nixon, Adam Azevedo

Mineta Transportation Institute Publications

This report summarizes the results from the fourteenth year of a national public opinion survey asking U.S. adults questions related to their views on federal transportation taxes. A nationally representative sample of 2,531 respondents completed the online survey from February 13 to March 23, 2023. The questions test public opinions about raising the federal gas tax rate, replacing the federal gas tax with a new mileage fee, and imposing a mileage fee just on commercial travel. In addition to asking directly about support for these tax options, the survey collected data on respondents’ views on the quality of their local …

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Examining The Externalities Of Highway Capacity Expansions In California: An Analysis Of Land Use And Land Cover (Lulc) Using Remote Sensing Technology, Serena E. Alexander, Bo Yang, Owen Hussey, Derek Hicks Nov 2023

Examining The Externalities Of Highway Capacity Expansions In California: An Analysis Of Land Use And Land Cover (Lulc) Using Remote Sensing Technology, Serena E. Alexander, Bo Yang, Owen Hussey, Derek Hicks

Mineta Transportation Institute Publications

There are over 590,000 bridges dispersed across the roadway network that stretches across the United States alone. Each bridge with a length of 20 feet or greater must be inspected at least once every 24 months, according to the Federal Highway Act (FHWA) of 1968. This research developed an artificial intelligence (AI)-based framework for bridge and road inspection using drones with multiple sensors collecting capabilities. It is not sufficient to conduct inspections of bridges and roads using cameras alone, so the research team utilized an infrared (IR) camera along with a high-resolution optical camera. In many instances, the IR camera …

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A Bike System For All In Silicon Valley: Equity Assessment Of Bike Infrastructure In San José, Ca, Ahoura Zandiatashbar, Jochen Albrecht, Hilary Nixon Oct 2023

A Bike System For All In Silicon Valley: Equity Assessment Of Bike Infrastructure In San José, Ca, Ahoura Zandiatashbar, Jochen Albrecht, Hilary Nixon

Mineta Transportation Institute Publications

Investing in sustainable, multimodal infrastructure is of increasing importance throughout the United States and worldwide. Cities are increasingly making strategic capital investment decisions about bicycle infrastructure—decisions that need planning efforts that accurately assess the equity aspects of developments, achieve equitable distribution of infrastructures, and draw upon accurate assessment methods. Toward these efforts, this project uses a granular bike network dataset with statistical and geospatial analyses to quantify a bike infrastructure availability score (i.e., bike score) that accounts for the safety and comfort differences in bike path classes in San José, California. San José is the 10th largest U.S. city and …

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Metropolitan Transportation Commission Discretionary Transit Funding Methods Evaluation, Christopher E. Ferrell, John M. Eells, David Reinke, Richard Lee Oct 2023

Metropolitan Transportation Commission Discretionary Transit Funding Methods Evaluation, Christopher E. Ferrell, John M. Eells, David Reinke, Richard Lee

Mineta Transportation Institute Publications

In 2021, the Santa Clara Valley Transportation Authority (VTA) approached the Mineta Transportation Institute (MTI) with a proposal to have MTI provide an evaluation of the Metropolitan Transportation Commission’s (MTC’s) operational discretionary funding allocation policies and methods for Bay Area transit operators. The research was done in two parts. Part 1 investigated MTC’s past and current allocation methods for discretionary operational transit funding programs; Part 2 involved the evaluation of outcomes if MTC employed alternative allocation methods. After the Part 1 review of MTC’s various transit funding programs, the federal pandemic relief funds and the Transportation Development Act/State Transit Assistance …

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Pay-As-You-Go Driving: Examining Possible Road-User Charge Rate Structures For California, Asha Weinstein Agrawal, Samuel Speroni, Michael Manville, Brian D. Taylor Oct 2023

Pay-As-You-Go Driving: Examining Possible Road-User Charge Rate Structures For California, Asha Weinstein Agrawal, Samuel Speroni, Michael Manville, Brian D. Taylor

Mineta Transportation Institute Publications

This report lays out principles to help California policymakers identify an optimal rate structure for a road-user charge (RUC). The rate structure is different from the rate itself. The rate is the price a driver pays, while the structure is the set of principles that govern how that price is set. We drew on existing research on rate setting in transportation, public utilities, and behavioral economics to develop a set of conceptual principles that can be used to evaluate rate structures, and then applied these principles to a set of mileage fee rate structure options. Key findings include that transportation …

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Defining And Measuring Equity In Public Transportation, Christopher E. Ferrell, David Reinke, John M. Eels, Matthew M. Schroeder Sep 2023

Defining And Measuring Equity In Public Transportation, Christopher E. Ferrell, David Reinke, John M. Eels, Matthew M. Schroeder

Mineta Transportation Institute Publications

Transit should serve all users, regardless of age, race, ability, or any other identity. Policies and planning must be conscious of inequities when defining and measuring equity in public transportation. This study was done to aid the California Department of Transportation (Caltrans) and the state’s transit agencies in assessing transit service equity and assisting with evaluating past, existing, and future inequities. This report identifies and evaluates policies and practices associated with equity measurement in public transit from extant academic and professional literature sources. These include the Federal laws and regulations addressing Title VI of the 1964 Civil Rights Act and …

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Equity In Learning Opportunities For Middle School Students: Connecting Communities And Transportation Through Gis, Tom O’Brien, Ben Olson Sep 2023

Equity In Learning Opportunities For Middle School Students: Connecting Communities And Transportation Through Gis, Tom O’Brien, Ben Olson

Mineta Transportation Institute Publications

Geographic information systems (GIS) is part of an in-demand career skillset that can lead to safer streets in California communities. This project included a three-session bootcamp that introduced middle school students to transportation via GIS and gathered assessments on their awareness of transportation as a career pathway. The project built upon CSUTC TRANSPORTS’ Year 4 project, “K–12 Special Investigation Project: Mapping E-Commerce Locally and Beyond.” The bootcamp for this project was coordinated in partnership with Rio Hondo College, which provided the instructor and connection to the students at the Mountain View Unified School District in El Monte, CA. The bootcamp …

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Fiber-Based Seismic Damage And Collapse Assessment Of Reinforced Concrete Single-Column Pier-Supported Bridges Using Damage Indices, Yu-Fu Ko, Jessica Gonzalez Aug 2023

Fiber-Based Seismic Damage And Collapse Assessment Of Reinforced Concrete Single-Column Pier-Supported Bridges Using Damage Indices, Yu-Fu Ko, Jessica Gonzalez

Mineta Transportation Institute Publications

Near-fault earthquakes can have major effects on transportation systems due to the structural damage they impose on bridges. Therefore, it is imperative to assess the seismic damage of bridges appropriately, and this research focuses on reinforced concrete (RC) bridges. This research advances the seismic performance assessment of RC single-column pier-supported bridges with flexural failure under near-fault ground motion by use of ductility coefficients and damage indices. The methodology included modeling fiber-based nonlinear beam-column elements to simulate the damage development process of RC bridge piers under earthquake loadings, considering the global buckling of longitudinal steel bars, examining the cracking and spalling …

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Evolving Patterns Of Violence In Developing Countries, Brian Michael Jenkins, Bruce R. Butterworth, Sachi Yagu Aug 2023

Evolving Patterns Of Violence In Developing Countries, Brian Michael Jenkins, Bruce R. Butterworth, Sachi Yagu

Mineta Transportation Institute Publications

In August 2022, MTI issued a report entitled Changing Patterns of Violence Pose New Challenges to Public Surface Transportation in the United States. That report analyzed the frequency and lethality of attacks on public surface transport in economically advanced countries. But what has been going on in non-economically advanced countries – the vast majority of countries in the world? Using the MTI database of Terrorist and Serious Criminal Attacks Against Public Surface Transportation, the authors analyzed attacks against passenger trains and train stations, buses and bus stations and stops, and all rail infrastructure and operating and security personnel in both …

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System-Of-Systems Integration For Civil Infrastructures Resiliency Toward Multihazard Events, Vahid Balali Aug 2023

System-Of-Systems Integration For Civil Infrastructures Resiliency Toward Multihazard Events, Vahid Balali

Mineta Transportation Institute Publications

Civil infrastructure systems—facilities that supply principal services, such as electricity, water, transportation, etc., to a community—are the backbone of modern society. These systems are frequently subject to multi-hazard events, such as earthquakes. The poor resiliency of these infrastructures results in many human casualties and significant economic losses every year. An outline of a holistic view that considers how different civil infrastructure systems operate independently and how they interact and communicate with each other is required to have a resilient infrastructure system. More specifically a systems engineering approach is required to enable infrastructure to remain resilient in the case of extreme …

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Investing In California’S Transportation Future: 2022 Public Opinion On Critical Needs, Asha Weinstein Agrawal, Hilary Nixon Jul 2023

Investing In California’S Transportation Future: 2022 Public Opinion On Critical Needs, Asha Weinstein Agrawal, Hilary Nixon

Mineta Transportation Institute Publications

This study surveyed 3,821 adults living in California about their general travel behaviors and resources, use of ride-hailing, performance ratings for the transportation system and agencies responsible for transportation, transportation system improvement priorities, and preference for how transportation funds are allocated. Key findings include the following: • Californians are multi-modal: Although driving was the most common mode, respondents reported that in the previous 30 days 66% had made a walk trip, 28% had used ridehailing, 25% had used public transit, and 22% had bicycled. • Although many respondents had at least once substituted ride-hailing for transit, walking, or bicycling and …

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Electrical Vehicle Charging Infrastructure Design And Operations, Yu Yang, Hen-Geul Yeh Jul 2023

Electrical Vehicle Charging Infrastructure Design And Operations, Yu Yang, Hen-Geul Yeh

Mineta Transportation Institute Publications

California aims to achieve five million zero-emission vehicles (ZEVs) on the road by 2030 and 250,000 electrical vehicle (EV) charging stations by 2025. To reduce barriers in this process, the research team developed a simulation-based system for EV charging infrastructure design and operations. The increasing power demand due to the growing EV market requires advanced charging infrastructures and operating strategies. This study will deliver two modules in charging station design and operations, including a vehicle charging schedule and an infrastructure planning module for the solar-powered charging station. The objectives are to increase customers’ satisfaction, reduce the power grid burden, and …

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Extending The Service-Life Of Bridges Using Sustainable And Resilient Abutment Systems: An Experimental Approach To Electrochemical Characterization Of Lightweight Mechanically Stabilized Earth, Fariborz M. Tehrani, Kenneth L. Fishman, Farmehr M. Dehkordi Jul 2023

Extending The Service-Life Of Bridges Using Sustainable And Resilient Abutment Systems: An Experimental Approach To Electrochemical Characterization Of Lightweight Mechanically Stabilized Earth, Fariborz M. Tehrani, Kenneth L. Fishman, Farmehr M. Dehkordi

Mineta Transportation Institute Publications

Bridges are critical components of transportation infrastructure. This research addresses the need to extend the service life of bridges by improving the safety and reliability of bridge abutments and reducing their life-cycle cost and footprints. Mechanically stabilized earth (MSE) is a known strategy to enhance the economy and performance of bridge abutments. In addition, the application of rotary-kiln-manufactured lightweight aggregate backfills improves the performance of MSE bridge abutments with a leaner structural system. Such improvements include a reduction of structural demands due to a lower density, free drainage of granular materials, a high internal friction angle, less settlement with no …

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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 Jun 2023

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 Publications

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 …

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Pavement Condition Survey Using Drone Technology, Lerose Lane, Dingxin Cheng Jun 2023

Pavement Condition Survey Using Drone Technology, Lerose Lane, Dingxin Cheng

Mineta Transportation Institute Publications

Timely repairs of pavement defects are essential in protecting both public road and highway systems. Identification of pavement distresses is necessary for planning pavement repairs. This has previously been performed by engineers surveying the roadways visually in the field. As drone usage has progressed, it has become clear that drones are a valuable tool to enhance visual documentation, improve project communication, and provide various data for processing. The use of drone technology has improved both the speed and accuracy of capturing data. Available software has allowed the data to be processed and analyzed in an office environment. This report summarizes …

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