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 deployment of different alternative power sources and low-power sensors and equipment packages for remote (off-grid) road weather information system (RWIS) sites in the Aurora Program states in recent years has resulted in a number of system configurations and operational strategies. This report provides a comprehensive review, investigation, a
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The applications of Unmanned Aerial Systems (UAS) for bridge inspection, with emphasis on under-bridge inspection and fatigue crack detection, were studied in this report. The potential benefits and challenges of using UAS for bridge inspection were identified through an extensive literature survey. The feasibility of using UAS for fatigue crack de
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An experiment tested the effects of both communications about the functions of an attitude and communications about the functions of an attitude object on persuasion. Participants received a conventional message about the benefits of public transportation, a message about the benefits of positive public transportation attitudes, or a control messag
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The steady growth in online retailing continues to rattle long-established business models and theshopping patterns of consumers (who are also taxpayers, voters, and drivers). Those consumersare increasingly choosing shorter delivery cycles—opting in some cases to receive their goodswithin hours rather than days.The demand for more immediate delive
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In this study the authors developed a macroscopic analytical model for modeling the vehicle-to-vehicle (V2V) communication process. The proposed information propagation methodology is based on the Susceptible-Infected-Removed (SIR) model that is used to model the spread of epidemics in a fixed region. The enhanced version of this epidemic model wit
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The Idaho Transportation Department (ITD) seeks to make quality assurance practices for using reinforcing steel at Idaho job sites more efficient and cost effective while retaining safe and reliable outcomes. The Boise State University report examines current ITD practices, evaluates practices in 20 other state departments of transportation, and th
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Driven piles are commonly used in foundation engineering. The most accurate measurement of pile capacity is achieved from measurements made during static load tests. Static load tests, however, may be too expensive for certain projects. In these cases, indirect estimates of the pile capacity can be made through dynamic measurements. These estimates
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Building from large-scale testing involving sediment control technology, the goal of this research project was to perform large-scale evaluations of settling technologies in the sediment basin at Auburn University Erosion and Sediment Control Testing Facility (AU-ESCTF). In particular, the goal was to assess the impacts on the sediment basin perfor
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This research provides a synthesis of practices in organizational structuring and professional staffing of the innovative delivery units in several state DOTs across the nation that are actively utilizing alternative project delivery. Several major challenges and barriers faced by innovative project delivery units to fulfill project leadership staf
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The introduction of new technology generally brings new challenges and new methods to help with deployments. Agile methodologies have been introduced in the information technology industry to potentially speed up development. The Federal Highway Administration (FHWA) developed this document to help those interested in learning about Scrum Methods,
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This study sought further development of low permeability mix designs each using a different SCM including silica fume, slag cement, and metakaolin. A bridge repair project consisting of two different structures was selected for full scale study of the three low permeability designs. The repair project included four phases of deck construction that
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LTRC’s Geotechnical and Asphalt groups will be conducting two separate field and laboratory evaluations. The Geotechnical group will evaluate field densities of soil layers and the asphalt group will evaluate field densities on asphalt pavement layers. There are two overall objectives of this research proposal: (1) to conduct a validation study to
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Ease of construction, favorable span-to-depth ratios, aesthetic appeal and high torsional stiffness make adjacent precast prestressed concrete box-beams a popular option for short-to-medium span bridges. However, persisting durability and performance issues resulting from longitudinal deck cracking at shear key locations threaten its favorability.
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The rail industry’s recent shift towards larger and heavier railcars has influenced Class III/short line railroad operation and track maintenance costs. Class III railroads earn less than $38.1 million in annual revenue and generally operate first and last leg shipping for their customers. In Kansas, Class III railroads operate approximately 40 per
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This research project evaluated the behavior of adhesive and cementitious bonded anchoring systems per the approach found in the provisional standard AASHTO TP-84, in order to provide recommendations pertaining to the test method. Additional parameters studied included installation direction and extreme in-service temperatures. Polymer characteriza
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Many work zones require lane closures, and road users need to be notified of these closures through appropriate upstream signage. A literature review prepared for this study found several previous investigations indicating insufficient comprehension of the U.S. standard lane closure sign (designated in the Manual on Uniform Traffic Control Devices
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The determination of travel time conditions for traveler information plays an important role in setting driver trip expectation and informed route selection decisions. The Tennessee Department of Transportation (TDOT) has the ability to compute expected travel time within the four (4) urban areas where corridors have been fully instrumented with Sm
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To address the need for a rational but fast method to determine costs and a proposed permit fee, the research team developed the Stage 1 Expedient Analysis Method. The method was used to evaluate potential oversize/overweight (OS/OW) freight corridors that will serve Texas coastal port regions and border POEs during Stage 1 of this project. Using t
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This study developed a methodology to accurately estimate network-wide truck flows by leveraging existing point detection infrastructure, namely inductive loop detectors. The tracking model identifies individual trucks at detector locations using advanced inductive signatures and matches vehicle pairs at detector locations, using an extended form o
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The State of California has enacted ambitious policies that aim to reduce the state’s greenhousegas (GHG) emissions. Some of these policies focus on reducing the amount of drivingthroughout the state, measured in vehicle miles traveled (VMT), given that transportation,primarily automobile use, is the largest single source of California’s GHG emissi
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