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 use of de-icing salts on roads during the winter months has caused corrosion damage to bridge reinforcements, which has increased maintenance costs. The corrosion protection system most widely used by various State Departments of Transportation is a combination of quality concrete, adequate cover, and fusion bonded epoxy-coated reinforcing bars
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This work involved making a portable X-Ray Fluorescence Spectroscopy device available to district personnel and training them to use the device on a routine basis to analyze tire rubber-modified asphalt binder for tire rubber content. The Performing Agency worked with the Receiving Agency and producers from around the state to develop calibration s
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This study assesses the effectiveness of precipitation zones and Intensity-Duration-Frequency (IDF) curves used by the Nebraska Department of Transportation (NDOT) for designing drainage structures. Twenty stations were selected for the analysis of revised IDF curves out of forty-two stations. Datasets have been considered from the National Center
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Stone matrix asphalt (SMA) is a specialized asphalt mixture designed to improve pavement performance by combining a coarse aggregate skeleton with a high-binder content mortar. This innovative design, adopted by the Indiana Department of Transportation (INDOT) in the late 1990s, offers distinct advantages over conventional hot mix asphalt (HMA). Cu
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The purpose of this study was to assess recycled plastic-modified (RPM) asphalt mixtures field trials constructed in Virginia. This study documented and evaluated the constructability and laboratory performance of two plant-produced RPM mixtures compared with the Virginia Department of Transportation (VDOT) typical D and E surface mixtures as refer
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The primary goal of this project was to provide recommendations on incorporating CDA into FDOT’s Transportation System Management and Operations (TSM&O). Specific objectives included developing a Concept of Operations (ConOps) for incorporating CDA features in traffic management; formulating methods to test and evaluate infrastructure support for C
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The overarching goal of this study was to advance the deployment of innovative pavement technologies prevalent in the state of Missouri. In this study, the focus was on evaluating recycled polymers for use in asphalt mixtures and Balanced Mixture Design (BMD) implementation. Nine test sections were constructed on I-155 near Hayti, MO. Six sections
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Suburban arterial roadways must serve two conflicting road functions: regional mobility and access to the abutting land. The potential for conflicts between traffic passing through and traffic accessing road from the neighboring areas could raise safety concerns. Selecting an adequate cross-section is among important decisions that road designers a
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A significant amount of waste ash in the United States does not meet the necessary specifications for construction and other uses, and power plants are searching for a way to dispose of surplus waste ashes. To address this issue, this research aimed to treat waste ashes using CO2 injection in order to modify their properties and enable their benefi
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In addition to the expected environmental and energy security related benefits, however, high EV adoption raises concerns about the negative impact on revenue generation that has previously come from the gasoline tax. The Highway Trust Fund (HTF) has been challenged repeatedly for future sustenance, including declining gas tax revenue as consumers
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Vertiports represent an innovative approach to integrating aviation into municipal transportation networks. This guidebook is intended to aid communities in strategically planning vertiports by overseeing land planning processes, offering recommendations for incorporating vertiports into land plans, and detailing how to conduct site evaluations, in
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Modern asphalt mixtures are usually a combination of various materials from different sources, including reclaimed asphalt pavement (RAP) and recycling agents (RAs), and are used to attain sustainable growth. However, the lack of a well-established method for determining compatibility between various sources and types of virgin binder, aged binder
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The goal of this project was to develop a robust and rigorous before/after analysis framework for traffic safety interventions. In addition to analyzing traditional traffic data sources such as vehicle probe data and crash data, this study explored the use of Michelin event data to gain deeper insights into the safety performance of MD 210.
Rural public transit systems are typically small, demand-responsive systems. Revenues are generally not sufficient to cover the system’s costs, and the Federal Transit Administration (FTA) § 5311 program provides capital, planning, and operating assistance in support of these systems. State departments of transportation (DOTs) are responsible for d
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Semi-integral bridges constitute a promising alternative to conventional TxDOT bridges because they eliminate the need for deck expansion joints, which may significantly reduce bridge maintenance costs and potentially result in significant savings over the bridge service life. Adopting semi-integral bridges is particularly relevant to Districts wit
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With investments in seal coats exceeding $250 million annually, it is critical to apply the right treatment to the right road at the right time. Projects are typically selected based on the time since the last seal coat (an average of 7 years) with little to no testing performed to ensure that the section is a good candidate for a seal coat. The ob
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Centerline rumble strips (CLRS) significantly reduce severe head-on crashes on two lane roads, although installing CLRS in asphalt pavements may accelerate deterioration of the pavement at the longitudinal construction joint. Recent research has suggested chip sealing new rumble strips as a preventive measure; however, chip sealing immediately foll
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The objectives of this study were to integrate material, construction, maintenance, and performance information, and to deploy the unified data on a commercial system licensed by TxDOT so that Division and District personnel can access and interact with these data. Data from the SMGR, PA, and DCIS databases were identified, integrated, and processe
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This research developed and demonstrated a new approach to the accelerated fabrication of resilient steel bridges—built-up press-brake formed tub girders (PBTGs). Built-up PBTGs are comprised of webs that are cold bent via a press brake and bolted to separate, flat bottom and top flanges. This investigation included (1) designing and building two d
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The Indiana Department of Transportation (INDOT) utilizes the International Roughness Index (IRI) and Falling Weight Deflectometer (FWD) data to prioritize pavement maintenance across interstates, state roads, and U.S. highways. While IRI measures ride quality and FWD assesses structural integrity, their threshold values vary by road type, reflecti
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