The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations.
Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.
The main objectives of this research are to evaluate the different sources of geotechnical site variability and to quantify the effect of spatial site variability of soil properties; number, type, and quality of lab/in-situ test methods; number and type of pile load tests, location and distribution of soil borings /in-situ test methods, and gap cha
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The objective of this study is two fold. First, the study will review and evaluate the current PMS decision matrix and provide recommendations on the trigger values for different maintenance and rehabilitation treatment types based on mechanistic-empirical pavement design, pavement performance modeling, machine learning, decision-tree optimization,
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This research will focus on innovative practices to improve geotechnical data management, highlighting the development and implementation of a web-based platform to efficiently visualize and interpret geotechnical data, and to eventually facilitate project delivery. A web-based platform can incorporate multiple types of geotechnical and geoenvironm
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The objectives of this research project are: • Assess the feasibility of UAV use in Louisiana’s traffic incident management (TIM) and monitoring • Document issues and challenges in drone use for incident response • Develop an information guide on UAV use for TIM.
The objectives of this study are to investigate the factors contributing to older road user crashes in Louisiana and to recommend effective countermeasures to support the SHSP strategies in reducing traffic fatalities and severe injuries.
This report outlines the development of relations between the IDEAL-CT test results and the dynamic modulus of asphalt mixtures. In this, the second phase of a four-phase study, the theoretical results obtained as part of Phase I were validated by measuring dynamic modulus and cracking tolerance index values on nine different mixtures; seven of the
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This report contains the contents of the project to enhance load rating methods for assessing corroded unstiffened steel beam ends for the six New England States. The first task of the project was to collect and compile inspection reports information provided by DOTs within New England. The research team was able to carefully identify trends and pa
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The objective of this research was to develop the deterioration curves of the primary bridge superstructure designs to understand their characteristics over time. The research methodologies involved a meticulous data collection and processing step, analyzing Ohio's historical bridge inventory dating back to the mid-1980s, followed by deterioration
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The objective of this research was to develop the deterioration curves of the primary bridge superstructure designs to understand their characteristics over time. The research methodologies involved a meticulous data collection and processing step, analyzing Ohio's historical bridge inventory dating back to the mid-1980s, followed by deterioration
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This document is the result of that five-year process, and it is the second version of the research report on the future of airports at the 20- and 50-year horizons. It should be read as a guide to understand the challenges and opportunities ahead. It features tools and technical contents documenting trends and emerging issues. Finally, it contains
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The Sidewalking toolkit supports youth mobility and youth agency by sharing effective, design-based strategies for engaging young people in envisioning their own mobility futures. We created this guide to help planners, designers, policymakers, and advocates who are already invested in supporting safe, social mobility options for youth, and who are
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The objective of this study was to explore the use of existing DOTD Pavement Management System (PMS) and Light Detection and Ranging (LiDAR) data to develop a pavement drainage condition rating index for Louisiana, with the goal of integrating drainage evaluation into the Pavement Management System (PMS) as part of the overall pavement condition as
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In this study, nonlinear deformation analyses (NDA) and equivalent-static analyses (ESA) approaches were evaluated for a model bridge embankment that was underlain by a non-liquefiable crust layer, a liquefiable medium dense sand layer, and a non-liquefiable deep dense sand layer. The embankment and underlying ground conditions were selected to rep
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In recent decades, emerging technologies have significantly transformed the transportation sector, offering a wider range of vehicle options and mobility alternatives. However, the recent COVID-19 pandemic disrupted many aspects of daily life, likely leaving long-lasting effects that further complicate our understanding and prediction of individual
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This project builds on the findings of Texas Department of Transportation (TxDOT) Project 0-6984, Evaluate Potential Impacts, Benefits, Impediments, and Solutions of Automated Trucks and Truck Platooning on Texas Highway Infrastructure, completed by the Texas A&M Transportation Institute in 2020.
As privately owned and shared autonomous vehicles (AVs and SAVs) and automated trucks (ATrucks) become available, TxDOT and partner agencies must anticipate their travel, trade, emissions, cost, and other implications. Introducing these modes can significantly alter mode choices for passenger travel and freight and impact traffic volumes and conges
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This research focuses on optimizing the design of cast-in-place, precast-panel (CIP-PCP) bridge decks by developing recommendations for standard ready-mix steel fiber reinforced concrete (SFRC) using domestically produced steel fibers. The project, stemming from the efficient and durable nature of CIP-PCP decks, builds upon prior work at the Univer
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This study includes an initial comprehensive evaluation of the state-of-the-practice in the US regarding the adoption of integral and semi-integral bridges. It also involved a large-scale experimental study focusing on the effect of cyclic movements on the potential buildup of lateral earth pressures acting on the backwalls of a semi-integral bridg
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This study showed that RSHC concrete can be designed to meet structural class specifications in terms of fresh (i.e., workability and working time) and hardened properties (early- and/or later-age strength). However, information is still needed to fully understand their performance in various durability-related distresses. In particular, more work
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Highway construction and maintenance work is one of the most hazardous occupations in the United States. In 2018, more than 7,000 work-zone collisions occurred on California roadways, about 2,300 resulting in injuries, and 46 involving fatalities. This research helped move toward reducing those numbers. The California Department of Transportation (
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