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.
Some of Louisiana’s bridges built in the 1950s and 1960s used two-girder or truss systems, in which floor beams are carried by main members and continuous (spliced) stringers are supported by the floor beams. The main members are either two edge (fascia) girders or trusses. Stringer bottom flanges are in compression at the negative moment region, w
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An implementation agreement was adopted by the American Association of State Highway and Transportation Officials (AASHTO) and the Federal Highway Administration that coincided with the publication of the second edition of the AASHTO Manual for Assessing Safety Hardware (MASH). Subsequently, numerous roadside safety devices have been crash tested t
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This report describes a study conducted to evaluate the performance and quantify the potential environmental benefits of recycled asphalt pavement projects completed in Virginia. The performance of the recycled projects was assessed by evaluating collected stiffness data and by the development of performance prediction models based on data obtained
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State Departments of Transportation (DOTs) have been facing a challenge of shrinking budgets and substantial reductions in both the numbers and experience levels of inspectors over the last decade. Many state DOTs, including the Kansas Department of Transportation (KDOT), have lost experienced construction inspection staff while the numbers of proj
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Overhead truss sign structures (OHTSS) are widely used over highways across the nation. An overhead truss sign structure is comprised of a truss and two supporting frames at each end, and can be made using aluminum or steel. Aluminum overhead truss sign structures are generally more prone to vibration issues due to their light weight (Fouad et al.
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This study explores the question of whether California's freight system is staying competitive with other US regions. A novel analytical framework compares supply chain performance metrics across multiple US states and regions for seaports, airports, highways, freight rail service, and distribution centers by combining the Performance Evaluation Ma
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Steel bridges commonly have corrosion at beam ends because of leaking joints, which provide a pathway for de-icing salts to fall onto the beams from the roadway above. Once beam ends have corrosion damage, it becomes more difficult to determine their remaining shear capacity to be used for load rating. This is because classical design equations are
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With the Motorcycle Crash Causation Study (MCCS) dataset mapped to the Florida crash database, an effort to obtain a complementary understanding and knowledge of characteristics related to locational, temporal, trip, motorcycle, injury, and contributing crash factors by most harmful event was conducted to lead to informed decision-making by the Flo
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This research project focused on evaluating the performance of internally cured concrete mixtures for bridge deck and pavement with the aim of reducing volumetric changes, i.e., cracking and warping. The specific tasks conducted in this project include a literature review of internal curing technology and experiences in the US, a survey of existing
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In this research, a statewide forecasting land-use model is presented. The land-use model is called the Large-Scale Land Use Model (LS-LUM)and can be integrated with Tennessee Statewide Travel Demand Model (TSMv3). Massive data collection was followed in this project and households ’information, employment information, housing information was colle
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Mechanical properties of commercially available temporary pavement marking (TPM) tapes and thermoplastic materials used as permanent pavement markings (PPM) were investigated using the non-destructive Tape Drape Test and conventional mechanical testing. The impact of temperature and aging on the adhesion of TPM tapes and thermoplastic PPM applied t
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Excessive moisture influences pavement performance by increasing surface deflection and decreasing bearing capacity. Seasonal fluctuation of groundwater, flooding, and spring thaw can all lead to changes in soil moisture and consequently stress states. Load restriction during and after inundation plays a key role in service life and maintenance pla
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The objective of this project was to evaluate the influence of different reinforcing bar surface coatings on crack control performance. Five different reinforcing bar coatings were used: black (uncoated), conventional (smooth) epoxy, textured-epoxy, hot-dipped galvanized, and continuously galvanized coatings. Five different series of laboratory tes
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The Virginia Department of Transportation (VDOT) maintains more than 100,500 lane-miles of pavement on the secondary network. Of this total, more than 95% of the lane-miles have an annual average daily traffic of less than 3,500 vehicles. Pavement recycling techniques (such as full depth reclamation [FDR] and cold in-place recycling) can be used to
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The team sought to explore the effectiveness of spot tamping in fine-filled ballast as part of a larger project that studied the effect of moisture and maintenance in fine-filled ballast at the FAST Rainy Section.
This report summarizes tasks performed toward the development of a Concept of Operations (ConOps) for a mobile/smartphone application designed to assist pedestrians with disabilities when crossing the street at signalized intersections. This app, if developed and rolled out, will interact directly with the traffic signal system controlling the inte
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2021-10-01
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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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Wisconsin Department of Transportation. Research and Library Unit
2021-09-30
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The Wisconsin Department of Transportation (WisDOT) managed a $4.34 million program for research and technology transfer services during federal fiscal year (FFY) 2021. The State Planning and Research Part B (SPR-B) federal program funded 91 percent ($3.96 million) of the program, while state funds covered the remaining nine percent ($0.38 million)
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In recent years, the continuous growth of private cars, the tight supply of land resources and the continuous poor air conditions have led policy makers to advocate sustainable public transportation. Bike sharing system has been introduced by many cities and developed worldwide rapidly, due to its advantages in reducing environmental pollution and
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The main objectives of this project are to develop crash prediction models for driver behavior related crashes and to develop a web application tool to be used by practitioners for performing hot spot identification and selecting effective countermeasures to mitigate crashes related to different types of driver behaviors. Other than the traditional
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