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.
Superpave 5 (SP 5) has the ability to slow asphalt binder aging in asphalt pavements, which is why the SP 5 mix with optimum asphalt binder content to yield 5% air voids has recently been used in Indiana roads. INDOT also uses the AASHTOWare Pavement ME design software in pavement design, and the current asphalt aging prediction model in Pavement M
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To protect waterways adjacent to construction projects with disturbed land, a 50 ft (15 m) vegetated buffer or equivalent sediment controls are required. However, there is little guidance on the effectiveness of vegetated buffers in removing sediment or how sediment barriers can aid shorter buffers or replace buffers. A modeling methodology was dev
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The Iowa secondary road system has a large number of scour-susceptible bridges or bridges with unknown foundation conditions. While scour countermeasures have historically included conventional riprap, fully grouted riprap, and other systems, a promising option is a partially grouted revetment (also known as partially grouted riprap). Partially gro
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State transportation agencies are adopting an expanded context classification system to inform project development and delivery. This system classifies roadways into one of five categories based on factors such as level of development, building densities and setbacks, multimodal user patterns and requirements, network permeability, and speed. Compa
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Commercial motor carrier customers on Kentucky highways must register and pay taxes for licensing and credentialing requirements. The Kentucky Transportation Cabinet (KYTC) provides an online Motor Carrier Portal that offers information and instructions on meeting these requirements, but customers have increasingly resorted to calling into KYTC’s m
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The Kentucky Transportation Cabinet (KYTC) and transportation agencies around the United States increasingly depends on uncrewed aircraft systems (UAS — also commonly known as drones) to collect data and accelerate project development and delivery. Drones let transportation practitioners safely and efficiently perform many activities, including bri
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There is a significant amount of uncertainty when designing piles for bridge foundations in liquefiable soil. Currently, Arkansas Department of Transportation (ARDOT) engineers use a standard penetration test (SPT)-based liquefaction spreadsheet developed 10 years ago to evaluate liquefaction triggering. Since this spreadsheet was developed, update
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The Texas Department of Transportation (TxDOT) is currently facing many challenges. Three such challenges in the areas of asphalt pavements and laboratory testing involve (a) cracking and rutting distresses, (b) hiring and retaining employees, and (c) laboratory safety. TxDOT has been addressing the cracking and rutting problems by implementing a b
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State highway agencies including the Texas Department of Transportation (TxDOT) are currently facing many challenges. Three such challenges involve addressing (a) the cracking and rutting distresses that are costing taxpayers billions of dollars annually, (b) the loss of both the workforce and the skills associated with the workforce, and (c) labor
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AMAZE is a cutting-edge solution designed to revolutionize the asphalt mixture testing process. The goal of the system is to increase consistency and accuracy of test results, eliminate human error, improve efficiency, and reduce testing times. AMAZE is engineered to automatically measure four essential asphalt mixture properties: bulk specific gra
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This study investigates the resistance forces acting on a cargo train under real operating conditions using experimental methods. By analyzing motion parameters such as speed, acceleration, and traction forces obtained through onboard measurement systems, the authors establish empirical resistance curves across various operational scenarios. The re
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The objective of this project is to evaluate published literature regarding the efficacy of IDEAL-CT and IDEAL-RT test methods to characterize the performance of asphalt mixtures in the field. Many agencies have used and researched these BMD methods, and reviewing their efficiency can provide the state of Louisiana with additional tools and help ag
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Research has demonstrated the multiple benefits of fibers for the early and late-age performance of concrete pavements and bridge decks. Many research studies have also shown that the expected enhancements in properties of concrete with recycled fibers could be commensurate with those of concrete reinforced with virgin fibers. However, compared wit
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In this implementation project, researchers first conducted a pilot testing of the safety prediction methodology. Researchers selected a sample of approximately 2 hours in duration containing multiple examples in the second session to demonstrate use of the spreadsheet tools.
The objective of this research project is to identify the most efficient compaction procedure for AASHTO #1, #57, and #8 aggregates by varying equipment type (both heavy and lightweight), moisture content, lift thickness, roller speed/operation duration, and number of passes needed to meet the non-movement condition through a literature review, sur
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Interference events, both intentional and unintentional, are significant threats to global navigation satellite system (GNSS) service continuity. In the presence of interference, it can be difficult for GNSS receivers to maintain continuous tracking of carrier phase and frequency. To address this issue, in place of a traditional phase-locked loop (
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The expectation of improved flood warnings has become critical for many agencies and communities at a time when flooding is increasingly severe and widespread. Formulation of flood warnings for a specific area entails three major steps: A) forecasting the flood hazards, B) delineation of the flood maps, and C) assessment of the threats to human saf
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We examined the user perspective about autonomous ride sharing services among older adults (50+ years of age) in three different geographic areas in Florida (Lake Nona, Port St. Lucie, and The Villages). We utilized the Autonomous Ride Sharing Services Survey and participants’ lived experiences before and after exposure to the autonomous shuttle. O
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The research presented in this paper examines a new proposed approach for identifying safety improvement sites on rural highways. Unlike conventional approaches, the proposed approach does not require crash history, but rather utilizes classified variables for traffic volume, geometric features, and roadside characteristics that do not require acce
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The Internet-of-Things (IoT) is a rapidly growing area of wireless communication technology that allows devices to communicate with computers and humans via the Internet. This technology goes far beyond simply connecting devices to the internet, it creates opportunities to combine data from these devices with automated systems for the purpose of an
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