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.
Accelerated bridge construction (ABC) has been utilized in precast bridge structures because of its advantage to expedite on-site construction. In ABC, one of the main concerns is the joint connection as it needs to be well designed to maintain structural integrity. Several studies were able to demonstrate the effectiveness of ABC pocket connection
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This report presents the findings and conclusions of a multi-methodology investigation into the transportation-related needs and barriers facing people with disabilities (PWD). Data collection consisted of a nationwide survey, with participant recruitment assisted by a variety of disability advocacy groups, and follow-on interviews conducted with a
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Autonomous vehicles (AVs) are a near future reality and the implications of AVs on city development and urban form, while potentially widespread and dramatic, are not well understood. In addition, there are other fundamentally disruptive technological forces undergoing simultaneous rapid development and deployment, including the introduction of new
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The American auto industry is in the midst of a revolution in electric vehicle (EV) technology. While market penetration of EVs is still fairly modest at present, continuing advances in battery materials and charging technology will arguably increase the number of EVs in use going forward. Since EVs require a unique charging infrastructure, the rol
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Concrete and composite (asphalt over concrete) pavement distress frequently occurs in the vicinity of joints or cracks in the concrete slabs. Water can enter into the pavement structure at these locations, leading to concrete deterioration and loss of subgrade support. Permanently patching these weakened areas can extend the pavement life considera
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The inspection of bridges is an important component in maintaining a safe and efficient highway system. Portions of bridges underwater can be difficult to inspect due to lack of visibility and accessibility. Traditionally underwater inspections are performed using commercial diving operations. This requires specially trained individuals and the app
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The Federal Highway Administration (FHWA) has been promoting the Geosynthetic Reinforced Soil Integrated Bridge System (GRS-IBS) technology for bridge abutments through the Every Day Counts (EDC) initiative. To realize the potential benefits of using GRS-IBS abutments in Louisiana, the Department of Transportation and Development (DOTD) built GRS-I
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The main goal of this dissertation was to develop frameworks, quantitative models, and databases needed to support data-driven, informed, and integrated decision-making in managing the vast transportation infrastructure in California. Such a management system was envisioned to consider both costs and environmental impacts of management decisions, b
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The Combs-Hehl Bridge is a series of structures over the Ohio River near Cincinnati spanning between Ohio on the east end and Kentucky on the west end. The overall bridge consists of four approach spans on the Kentucky side of the river (spans 1- 4), two main truss spans over the river, (spans 5 and 6), and four approach spans on the Ohio side of t
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The Eco-Approach and Departure (EAD) application has been proved to be environmentally efficient for a Connected and Automated Vehicles (CAVs) system. In the real-world traffic, traffic conditions and signal timings are usually dynamic and uncertain due to mixed vehicle types, various driving behaviors and limited sensing range, which is challengin
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In the first year of this project, our team was able to develop a good understanding of how floods impact travel times and roads in Iowa. The analysis allows us to understand what areas will be more or less accessible after floods, which can help in making decisions for establishing evacuation centers and routing people outside the flood zone. We d
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This report summarizes the research performed on the influence of pumping operations on the changes in workability, rheology, air content, air-void system, freeze-thaw and scaling resistance of self-consolidating concrete (SCC). This project is a collaboration between the RE-CAST Tier-1 UTC the ACI Foundation, the Kansas State University (through f
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The Clear Roads research consortium requested a tool to help transportation agencies more quickly and easily reconstruct winter weather events by drawing from data sources that cover the entire United States. The goals were to help agencies better understand the development and outcomes of hazardous weather events, react appropriately to them in th
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Concrete production uses a considerable amount of non-renewable natural resources and generates a significant amount of greenhouse gases. To obtain a more sustainable solution requires examining the two main components of concrete – aggregates and cement. Recycling concrete as aggregate for new concrete reduces construction waste, diverts material
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The main objectives of the project are: 1) Develop mix design(s) and examine fresh and hardened properties of SCC and FR-SCC mixes using two types of fibers and varying the proportion, 2) Investigate the compatibility and bond strength of FR-SCC as a repair material and select the mixes that yield the best performance and 3) Evaluate the structural
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This report discusses the advances and setbacks encountered when attempting to develop a vibration-free, selfconsolidating concrete for slipform applications. Such concrete would have significant advantages compared to conventional slipforming, as vibration would not be necessary. All negative aspects of incorrect vibration, such as inadequate air
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The Virginia Department of Transportation (VDOT) is committed to providing and maintaining transportation infrastructure for a transportation system of multiple modes, including bicycling and walking. A complete and well-maintained bicycle and pedestrian facility inventory is critical for that mission. Given the large number of bicycle and pedestri
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2020-01-01
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Domestic Airline Fares Consumer Report
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Each month the Department of Transportation releases an Air Travel Consumer Report that includes information about various service quality elements, including flight delays, mishandled baggage, over sales, and a variety of other types of consumer complaints. In response to an increasing number of inquiries from consumers about domestic airline pric
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Traditionally, DOTD has relied on a primarily paper-based process for field data collection. Mobile technology (defined as hardware and software that can be used in concert to allow integrated data collection, access to project-related information, and real-time communication capabilities) continues to improve and become more affordable. This resea
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Crash analysis methods typically use annual average daily traffic as an exposure measure, which can be too aggregate to capture the safety effects of variations in traffic flow and operations that occur throughout the day. Flow characteristics such as variation in speed and level of congestion play a significant role in crash occurrence and are not
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