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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.

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Showing 4681 - 4700 of 36020 results
  • Preliminary Investigation of Laser Induced Fluorescence Spectroscopy to Predict Limestone Aggregate FreezeThaw Susceptibility Technical Summary
    Preliminary Investigation of Laser Induced Fluorescence Spectroscopy to Predict Limestone Aggregate Freeze-Thaw Susceptibility [Technical Summary]
    Jones, Christopher ;
    Reinot, Tonu
    2020-05-01 | PDF
    This study evaluated the Laser Induced Fluorescence Spectroscopy (LIFS) technique as a potential predictive tool for freezing and thawing durability of concrete aggregates. A low-powered red laser and wide band spectrometer proved to work best for the aggregates tested. A partial least squares (PLS) for one variable modeling approach was used to co ...
  • I25 Gap Work Zone Performance Measures Report
    I-25 Gap Work Zone Performance Measures Report
    Waldman, Ben ;
    Mitchell, Matthew
    2020-05-01 | PDF
    Following the FHWA report, A Primer on Work Zone Safety and Mobility Performance Measurement, September 2011,regarding work zone safety and mobility measures, CDOT has prioritized the research of select methods to evaluate the performance of the I-25 Gap work zone and future CDOT construction projects. Work zone performance measures provide compara ...
  • MASH Evaluation of NETC Steel Bridge Rail and Transition Details Using Finite Element Analysis Fact Sheet
    MASH Evaluation of NETC Steel Bridge Rail and Transition Details Using Finite Element Analysis [Fact Sheet]
    Plaxico, Chuck A. ;
    Ray, Ethan M.
    2020-05-01 | PDF
    A critical review of current standard details and specifications for NETC style bridge rails and transitions used by MaineDOT, NHDOT, RIDOT and VTrans was conducted to identify differences in material specifications and dimensional details. An initial performance assessment was made for each bridge rail design based on strength calculations and rai ...
  • Implementation of New Guidelines for Tightening Large Anchor Rods of Support Structures for Signs and Luminaires
    Implementation of New Guidelines for Tightening Large Anchor Rods of Support Structures for Signs and Luminaires
    Phares, Brent ;
    Dietrich, Zachary
    2020-05-01 | PDF
    Throughout the US, many state departments of transportation (DOTs) are experiencing issues with the loosening of anchor bolt nuts on overhead sign, luminaire, and traffic signal (SLTS) structures. Retightening loose nuts imposes a significant drain on state DOT resources. In addition, loosening of these nuts increases fatigue stresses on the anchor ...
  • Supporting People with Vision Impairments in Automated Vehicles Challenge and Opportunities
    Supporting People with Vision Impairments in Automated Vehicles: Challenge and Opportunities
    Brewer, Robin ;
    Ellison, Nicole
    2020-05-01 | PDF
    Autonomous and automated vehicles (AVs) will provide many opportunities for mobility and independence for people with vision impairments (PwVI). This project provides insights on the challenges and potential barriers to their adoption of AVs. The authors examine adoption and use of ridesharing services. The authors study ridesharing as a proxy for ...
  • I25 South Gap Queue Warning System Evaluation
    I-25 South Gap Queue Warning System Evaluation
    Waldman, Ben ;
    Freitas, Jason
    2020-05-01 | PDF
    During a construction project, traffic traveling through the construction zone experiences frequent instances where construction vehicles, incidents, and recurring congestion interrupt traffic flow that result in long queues and delays as well as increased crash rates. In an effort to help mitigate these instances, CDOT has deployed numerous smart ...
  • Investigation of Driver License Issuance Alternatives
    Investigation of Driver License Issuance Alternatives
    Martin, Andrew ;
    Najarzadeh, Abraham
    2020-05-01 | PDF
    This study develops an alternative model for issuing driver licenses and personal identifications in Kentucky. Under the current model, most licenses are distributed by circuit court clerks at 142 offices across the state while the Kentucky Transportation Cabinet (KYTC) provides central and regional support for specific license types. Given the cum ...
  • Implementing AASHTO TP 110 for AlkaliSilica Reaction Potential Evaluation of Idaho Aggregates
    Implementing AASHTO TP 110 for Alkali-Silica Reaction Potential Evaluation of Idaho Aggregates
    Mishra, Deb ;
    Kassem, Emad
    2020-05-01 | PDF
    Alkali-Silica Reaction (ASR) has been recognized as a major distress in concrete for over a century. In the United States, ASR is a major cause of the deterioration of highway concrete structures. In Idaho, several aggregate sources have been reported to be ASR-susceptible. The primary objective of the current research study was to evaluate the adv ...
  • Preliminary Investigation of Laser Induced Fluorescence Spectroscopy to Predict Limestone Aggregate FreezeThaw Susceptibility
    Preliminary Investigation of Laser Induced Fluorescence Spectroscopy to Predict Limestone Aggregate Freeze-Thaw Susceptibility
    Jones, Christopher ;
    Reinot, Tonu
    2020-05-01 | PDF
    Qualifying concrete aggregates for resistance to freeze-thaw damage is a critical step to prevent concrete pavement deterioration in Kansas. Currently, Kansas Department of Transportation (KDOT) practice involves two laboratory tests for qualifying concrete aggregates: KTMR-21, Soundness and Modified Soundness of Aggregates by Freezing and Thawing, ...
  • Assessment of Safety Benefits of Technologies to Reduce Pedestrian Crossing Fatalities at Midblock Locations [supporting datasets]
    Ogle, Jennifer H ;
    Islam, Sababa
    2020-05-01 | ZIP
    In 2015, South Carolina ranked third in the nation in pedestrian fatalities per 100,000 population. Out of 979 total motor vehicle fatalities, 123 involved pedestrians, accounting for over 12% of all road user fatalities in South Carolina. While some individuals make conscious choices to walk and dwell in transit-oriented or mixed-use walkable comm ...
    Dataset Supporting Files
  • Integrated Implementation of Innovation Intersection Designs May 2020
    Integrated Implementation of Innovation Intersection Designs [May 2020]
    Rouphail, Nagui M. ;
    Cunningham, Chris
    2020-05-01 | PDF
    This study evaluated the performance of pedestrian-bicycle crossing alternatives at Continuous Flow Intersections (CFI). Further, a comparison was also performed of CFI crossing types against a standard intersection designed to provide an equivalent volume-to-capacity ratio. Three CFI crossing alternatives were tested, namely Traditional, Offset, a ...
  • Field Implementation of Compacted Concrete Pavement
    Field Implementation of Compacted Concrete Pavement
    Khayat, Kamal H. ;
    Farzadnia, Nima
    2020-05-01 | PDF
    The main objective of this research is to investigate the performance of Compacted Concrete Pavement (CCP) with special design features of surface texture that can reduce construction cost and secure safe and durable surface texture. This research was part of a larger project undertaken by the City of Mexico, Missouri in collaboration with Missouri ...
  • Evaluation of Hardened Paint Pavement Markings
    Evaluation of Hardened Paint Pavement Markings
    Dwyer, Carmine E. ;
    Becker, Rachel L.
    2020-05-01 | PDF
    The objective of this study was to obtain and analyze relevant technical and performance data of various pavement marking products to determine which products can be used to stripe various roadway surfaces and to withstand the spectrum of Arizona weather, ranging from intense ultraviolet exposure to abrasion from snowplow blades. Data gathering con ...
  • Evaluation of Truck Tonnage Estimation Methodologies Summary
    Evaluation of Truck Tonnage Estimation Methodologies [Summary]
    Zhong, Monica ;
    Kaisar, Evangelos I.
    2020-05-01 | PDF
    The primary objective of this study was to evaluate the current methodologies for estimating truck tonnage through a literature review and identify alternatives that could improve Florida’s current truck tonnage formula. The development of a new truck tonnage model was also an option.
  • Understanding the Effects of Slope Ratio Straw Mulching and Compost Addition to Topsoil to Establish Permanent Vegetation and Reduce Nutrient Runoff
    Understanding the Effects of Slope Ratio, Straw Mulching, and Compost Addition to Topsoil to Establish Permanent Vegetation and Reduce Nutrient Runoff
    Owen, Dylan ;
    Davis, Allen P
    2020-05-01 | PDF
    Soil erosion management is a major environmental challenge facing highway construction. This project analyzes sustainable improvements to current standard procedures for final grade turfgrass establishment on disturbed soils. Using a series of greenhouse studies, two compost types, biosolids and greenwaste, and four compost/topsoil blends were comp ...
  • Enhancing Existing Isolated Underpasses With Fencing To Decrease Wildlife Crashes and Increase Habitat Connectivity
    Enhancing Existing Isolated Underpasses With Fencing To Decrease Wildlife Crashes and Increase Habitat Connectivity
    Donaldson, Bridget M. ;
    Elliott, Kaitlyn E. M.
    2020-05-01 | PDF
    The impact of wildlife-vehicle collisions on drivers and wildlife populations has been gaining increasing attention in the United States. Given the established success of wildlife crossings with fencing in reducing wildlife crashes and connecting habitat, a growing number of states, including Virginia, have enacted wildlife corridor legislation, so ...
  • Evaluation of Bridge Deck Treatments Along I15 in Nephi Utah
    Evaluation of Bridge Deck Treatments Along I-15 in Nephi, Utah
    Mikulich, Matthew
    2020-05-01 | PDF
    This report reviews the available condition, history, and chloride testing results of twenty-two (22) reinforced concrete bridge decks on I-15 near Nephi, Utah from milepost 221 to 228. The bridges in this research group were constructed in the same era with similar details, and also experienced comparable vehicular and environmental loads. Each of ...
  • Enhanced Characterization of RAP for Cracking Performance Summary
    Enhanced Characterization of RAP for Cracking Performance [Summary]
    Moseley, Howard L ;
    Roque, Reynaldo
    2020-05-01 | PDF
    University of Florida researchers evaluated the effect of RAP binder stiffness, fineness, and gradation on cracking resistance to determine whether the current maximum RAP usage in polymer-modified asphalt (PMA) mixtures can be increased. They also examined the effect of RAP on asphalt mixtures made with high polymer (HP) binder. If more RAP could ...
  • Traffic Safety Facts 2018 Data RuralUrban Comparison of Traffic Fatalities
    Traffic Safety Facts 2018 Data: Rural/Urban Comparison of Traffic Fatalities
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2020-05-01 | PDF
    For this fact sheet, rural and urban boundaries are determined by the State highway departments and approved by the Federal Highway Administration. The State highway departments use the boundaries decided by the Census Bureau. In this fact sheet for 2018, the information about rural and urban traffic fatalities is presented as follows: Overview; En ...
  • Revisiting TODs: How Subsequent Development Affects the Travel Behavior of Residents in Existing Transit-Oriented Developments [supporting datasets]
    Portland State University. Transportation Research and Education Center (TREC)
    2020-05-01 | ZIP
    Portland State University has worked with the Portland Metro regional government periodically since 2005 to survey occupants of buildings for which developers had received funding from Metro’s Transit-Oriented Development (TOD) Program. This research extends upon the prior TOD surveys in Portland by revisiting a set of developments with a second wa ...
    Dataset Supporting Files
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