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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 6021 - 6040 of 36958 results
  • ITS Support for Pedestrians and Bicyclists Count Developing a Statewide Multimodal Count Program Tech Summary
    ITS Support for Pedestrians and Bicyclists Count: Developing a Statewide Multimodal Count Program [Tech Summary]
    Codjoe, Julius ;
    Zeringue, Kirk M.
    2019-07-01 | PDF
    Understanding the travel behavior of pedestrians and cyclists on Louisiana’s roadways is critical to evaluating safety outcomes relative to rates of exposure; identifying appropriate, context-sensitive complete streets infrastructure interventions; and understanding overall statewide and location specific transportation trends. Better understanding ...
  • Development and Regionalization of In Situ Bioslopes and Bioswales
    Development and Regionalization of In Situ Bioslopes and Bioswales
    Johnson, Kurt W. ;
    Cai, Meijun
    2019-07-01 | PDF
    This project is a multi-disciplinary investigation into the use of alternative media for biofiltration systems in Minnesota. Over the last thirty years, the Minnesota Department of Transportation (MnDOT) has implemented biofilters along roadways as a stormwater control measure. These systems must be able to infiltrate and treat the first inch of ra ...
  • Safety Analysis for SHIFT Implementation
    Safety Analysis for SHIFT Implementation
    Souleyrette, Reginald ;
    Tanzen, Riana
    2019-07-01 | PDF
    The Strategic Highway Investment Formula for Tomorrow (SHIFT) program research team evaluated the program’s 2018 safety component and developed a new methodology to rank the safety needs of 2020 projects. For the current year, the research team suggests replacing the SHIFT 2018 formulas (based on three naive crash measures) with a new metric, Exces ...
  • Communications and RadarSupported Transportation Operations and Planning Phase 2 Final Report
    Communications and Radar-Supported Transportation Operations and Planning – Phase 2: Final Report
    Motro, Michael ;
    Kim, Taewan
    2019-07-01 | PDF
    This project designs a conceptual framework to harness and mature wireless technology to improve transportation safety, with a focus on frontal collision warning/collision avoidance (CW/CA) systems. The framework identifies components of the technology and its capabilities, and how these components can be integrated to improve transportation safety ...
  • Chemical Characterization of Asphalts Related to Their Performance Tech Summary
    Chemical Characterization of Asphalts Related to Their Performance [Tech Summary]
    Daly, William ;
    Cooper III, Samuel
    2019-07-01 | PDF
    Using recycled asphalt pavements (RAP) and recycled asphalt shingles (RAS) blended with virgin binder for new road pavements is an environmentally friendly way to recycle the used asphalt. In this project, researchers studied a correlation between the molecular structure of asphalt binders of conventional hot mix asphalt mixtures (HMA) containing r ...
  • IronEnhanced Swale Ditch Checks for Phosphorus Retention
    Iron-Enhanced Swale Ditch Checks for Phosphorus Retention
    Natarajan, Poornima ;
    Gulliver, John S.
    2019-07-01 | PDF
    Iron-enhanced ditch checks in roadside swales were developed specifically for capturing dissolved phosphorus and dissolved metals from roadway runoff in both urban and agricultural environments. One iron-enhanced ditch check constructed along CR 15 (formerly TH 5) in Stillwater, Minnesota, was monitored during 40 storm events from 2016 to 2018. The ...
  • Test Procedure for Validation of Automated Distress Data Technical Report
    Test Procedure for Validation of Automated Distress Data: Technical Report
    Wimsatt, Andrew ;
    Fernando, Emmanuel
    2019-07-01 | PDF
    This project developed a performance-based specification for automated distress data collections systems based on analysis of data provided by the Texas Department of Transportation (TxDOT), analysis of data collected under this research study, and discussions with three experienced providers of distress data collection. The research team also assi ...
  • Traveler Information Application for Route 1 and Route 18 Corridors
    Traveler Information Application for Route 1 and Route 18 Corridors
    Lawson, Catherine T.
    2019-07-01 | PDF
    The final product of this research is an enhanced Mobile Application platform that receives travel time information, parking information and transit/shuttle schedule information in real time for the Routes 1 (from I-295 to Garden State Parkway) and 18 (from New Jersey Turnpike to Rutgers University – Piscataway, NJ) corridors, specific to certain d ...
  • Truss Bridge Rehabilitation Prioritization
    Truss Bridge Rehabilitation Prioritization
    Peiris, Abheetha ;
    Harik, Issam E.
    2019-07-01 | PDF
    Kentucky’s inventory of historic steel truss bridges is declining rapidly. There are more than 150 historic truss bridges in the Kentucky Transportation Cabinet’s (KYTC) bridge inventory. Most of these bridges require maintenance to avoid replacement. However, prioritizing the rehabilitation of these bridges based on their historic importance is ch ...
  • SHSPHSP Crosswalk A Tabular Comparative Presentation of Louisianas Strategic Highway Safety Plan SHSP and Highway Safety Plan HSP
    SHSP-HSP Crosswalk: A Tabular Comparative Presentation of Louisiana’s Strategic Highway Safety Plan (SHSP) and Highway Safety Plan (HSP)
    Capone, Rudynah
    2019-07-01 | PDF
    This technical report examined the Strategic Highway Safety Plan (SHSP) and Highway Safety Plan (HSP) documents of Louisiana to conduct a crosswalk analysis and determine where highway safety strategies in both plans overlap, co-exist, duplicate, or intersect. Targets, approaches, and strategies between the two planning documents were comparatively ...
  • Prestress Loss Due to Creep in Precast Concrete Decked BulbTee Girders in Cold Climates
    Prestress Loss Due to Creep in Precast Concrete Decked Bulb-Tee Girders in Cold Climates
    Vandermeer, Drew ;
    Ahn, Il-Sang
    2019-07-01 | PDF
    Accurate estimation of pre-stress losses is one of the important issues for the design of precast, pre-stressed concrete bridge girders. While this subject has been long studied by many researchers, studies on pre-stress losses in cold climates are minimal. In the present research, long-term pre-stress loss due to concrete creep was studied based o ...
  • Field Demonstration of Tendon Imaging Methods
    Field Demonstration of Tendon Imaging Methods
    Dukeman, David ;
    Freij, Hani
    2019-07-01 | PDF
    Inadequate grouting is associated with corrosion of post-tensioning steel in grouted tendons used in construction applications. A nondestructive method capable of revealing grout deficiencies of external tendons was developed under concurrent Florida Department of Transportation (FDOT) Project BDV25-977-24. The method uses impedance and magnetic me ...
  • Effect of Proximity of Sheet Pile Walls on the Apparent Capacity of Driven Displacement Piles Phase 2 Summary
    Effect of Proximity of Sheet Pile Walls on the Apparent Capacity of Driven Displacement Piles, Phase 2 [Summary]
    Chung, Jae
    2019-07-01 | PDF
    University of Florida researchers investigated the effects of installation and removal of sheet pile walls on piles driven into granular soils.
  • Evaluation of Sustained Enforcement Education and Engineering Measures on Pedestrian Crossings
    Evaluation of Sustained Enforcement, Education, and Engineering Measures on Pedestrian Crossings
    Morris, Nichole L. ;
    Craig, Curtis M.
    2019-07-01 | PDF
    Pedestrian fatalities and injuries represent a growing percentage of all traffic fatalities and injuries. This project used a multifaceted approach to improving compliance to the Minnesota crosswalk law in Saint Paul, Minnesota, including: (1) education, (2) measurement, (3) enforcement efforts, (4) social norming, and (5) engineering treatment. Th ...
  • Phase VI 20152017 NCAT Test Track Findings
    Phase VI (2015–2017) NCAT Test Track Findings
    West, Randy ;
    Timm, David
    2019-07-01 | PDF
    The National Center for Asphalt Technology (NCAT) Test Track is a pavement proving ground that was originally constructed from 1998-2000. This 1.7-mile oval track is a unique accelerated pavement testing facility that utilizes full-scale pavement construction of test sections and highway-speed, heavy trafficking to provide analysis of asphalt pavem ...
  • Institute for Trade and Transportation Studies PHASE II Project Review
    Institute for Trade and Transportation Studies PHASE II Project Review
    Lambert, Bruce
    2019-07-01 | PDF
    The Institute for Trade and Transportation Studies (ITTS) serves as a regional organization of state departments of transportation in the Southeast. The ITTS provides research data and expert opinions to its members concerning the effects of commercial freight movements on domestic and international activities, with reference to infrastructure and ...
  • Identification of Bridges With FractureProne Details
    Identification of Bridges With Fracture-Prone Details
    Hopwood II, Theodore ;
    Younce, Rick
    2019-07-01 | PDF
    Welded steel girder bridges can contain details that can high welding and service stresses and are termed constraint-induced fractures (CIF). The Kentucky Transportation Cabinet has steel bridges with weld details known to cause CIFs whose girders have experienced fracture events. The Cabinet’s bridge inventory was reviewed and additional candidate ...
  • MnDOT Slope Vulnerability Assessments Phase 2
    MnDOT Slope Vulnerability Assessments Phase 2
    Holmstadt, Jen ;
    Bradley, Nick
    2019-07-01 | PDF
    This project, Phase 2 Slope Vulnerability Assessments, is a continuation of the Phase 1 project previously conducted by WSB and MnDOT to determine the risk of slope failure along state highways. The Phase 2 study area includes 32 counties located in districts 4, 6, 7, 8, and Metro. This reports outlines the methods and results of this project inclu ...
  • Redefining the Child Pedestrian Safety Paradigm
    Redefining the Child Pedestrian Safety Paradigm
    Ferenchak, Nick ;
    Marshall, Wesley E.
    2019-07-01 | PDF
    Child pedestrians are some of the most vulnerable users of our transportation systems, and they deserve particular attention when we consider traffic safety. Part 1 of this report identifies locations in urban areas where child pedestrians are at particular risk for fatal collisions with vehicles. We do so by examining 30 years of crash data for si ...
  • Development of a Workshop on Automated Vehicle Technologies
    Development of a Workshop on Automated Vehicle Technologies
    Davis, Brian ;
    Johnson, Reed
    2019-07-01 | PDF
    Connectivity and automation in vehicles have the potential to change nearly every aspect of our transportation system. Vehicles with these capabilities are already being tested on public roads and are beginning to enter the national fleet. These vehicles have the potential to bring numerous benefits to the public, but these benefits come with trade ...
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