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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 1601 - 1620 of 36873 results
  • The Impact of Diamond Grind Pavement Resurfacing on PM10 Emissions
    The Impact of Diamond Grind Pavement Resurfacing on PM10 Emissions
    Miech, Jason ;
    Aker, Saed
    2024-05-01 | PDF
    An assessment of tire-wear emissions was conducted to identify differences due to diamond ground and asphalt rubber asphalt concrete friction surfaces. The evaluation involved collecting representative aerosol samples from local freeways with both surface types under different meteorological conditions and with varying traffic conditions. The field ...
  • Test Procedure for Rapid Mix Design of CementTreated Base
    Test Procedure for Rapid Mix Design of Cement-Treated Base
    Sebesta, Stephen ;
    Taylor, Ross
    2024-05-01 | PDF
    SCOPE: 1.1 Tex-120-E consists of three parts. 1.1.1 Part I determines the moisture-density curve of material treated with cement. 1.1.2 Part II determines the target cement content using the unconfined compressive strength of samples molded in accordance with Tex-113-E and cured for 7 days. 1.1.3 Part III develops a laboratory mixture design for ce ...
  • Evaluation of Traffic Safety for Heavy Commercial Vehicles at Roundabouts in Minnesota
    Evaluation of Traffic Safety for Heavy Commercial Vehicles at Roundabouts in Minnesota
    Wagner, Mark ;
    DeVoe, Eric
    2024-05-01 | PDF
    Modern roundabouts have been shown to be one of the safest methods of control for at-grade intersections. An evaluation of traffic safety at roundabouts published by MnDOT in 2017 shows substantial decreases in fatal and serious injury crashes at intersections after installation of a roundabout. Despite these benefits, concerns have been raised fro ...
  • Effects of Legalization of Marijuana on Traffic Transportation Research Synthesis
    Effects of Legalization of Marijuana on Traffic: Transportation Research Synthesis
    CTC & Associates LLC
    2024-05-01 | PDF
    The legalization of recreational marijuana use in Minnesota in August 2023 prompted interest in the law’s potential impacts on traffic safety. MnDOT’s Office of Traffic Engineering requested this Transportation Research Synthesis (TRS) to learn from the experiences of other states with longer-standing laws legalizing the recreational use of marijua ...
  • Evaluating the Structural Properties and CostEffectiveness of GrapheneModified Asphalt Research Brief
    Evaluating the Structural Properties and Cost-Effectiveness of Graphene-Modified Asphalt [Research Brief]
    Senseney, Christopher T ;
    Tucker, Joseph L
    2024-05-01 | PDF
    The execution of this study involved laboratory testing, AASHTOWare Pavement ME design simulations, and LCCA of pavement designs with different asphalt pavement mixture scenarios. The asphalt binders with different GO dosages were subjected to a series of laboratory tests in the CDOT asphalt laboratory including the Dynamic Shear Rheometer (DSR), t ...
  • Update of Commercial Vessel Past Point Data for Designing Bridges Across Navigable Florida Waterway Summary
    Update of Commercial Vessel Past Point Data for Designing Bridges Across Navigable Florida Waterway [Summary]
    Kosar, Matthew ;
    Randell, Alexander
    2024-05-01 | PDF
    The objectives of this study were to update the FDOT vessel past point database that characterizes modern vessel traffic throughout navigable waterways in Florida and to develop updated models of future traffic projection.
  • Validating AASHTO PP84 Paste Volume Limits for Shrinkage Mitigation in UDOT Concrete Mixes
    Validating AASHTO PP-84 Paste Volume Limits for Shrinkage Mitigation in UDOT Concrete Mixes
    Al Sarfin, Md. Abdullah ;
    Sorensen, Andrew D.
    2024-05-01 | PDF
    This document presents the findings of an experimental study to evaluate the effect of the paste volume on the Utah Department of Transportation (UDOT) approved concrete mixtures. The AASHTO PP-84-17 provisional specification limits the maximum paste volume to 25%, while the selected UDOT approved mixtures have paste volume over 27%. The selected m ...
  • Traffic Safety Facts 2021 Data RuralUrban Comparison of Motor Vehicle Traffic Fatalities
    Traffic Safety Facts 2021 Data: Rural/Urban Comparison of Motor Vehicle Traffic Fatalities
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-05-01 | PDF
    Of the 42,939 motor vehicle traffic fatalities in 2021, there were 17,103 (40%) that occurred in rural areas, 25,598 (60%) in urban areas, and 238 (1%) in areas that were not reported as rural or urban. This fact sheet for 2021 compares rural and urban motor vehicle traffic fatalities, covering the following topics: crash characteristics; drivers; ...
  • Peak Temperature Determination of Drilled Shafts Excluded From Mass Concrete Consideration in Current Specifications Summary
    Peak Temperature Determination of Drilled Shafts Excluded From Mass Concrete Consideration in Current Specifications [Summary]
    Armenteros, Jose ;
    Mullins, Gray
    2024-05-01 | PDF
    The objective of this research project was to develop and implement methods to predict peak and differential temperatures of drilled shafts to determine if unsafe temperature conditions may arise for a given design.
  • Evaluating the Structural Properties and CostEffectiveness of GrapheneModified Asphalt
    Evaluating the Structural Properties and Cost-Effectiveness of Graphene-Modified Asphalt
    Senseney, Christopher T ;
    Tucker, Joseph L
    2024-05-01 | PDF
    Graphene oxide (GO) is a nanoscale material created from graphite. GO has the potential to increase the service life of asphalt binders and asphalt mixtures, but there are concerns about the high cost of GO. The objective of this study is to provide the cost benefit of using GO in neat and SBS modified asphalt binders for a simulated asphalt paveme ...
  • OSTR Research Roundup Newsletter May 2024
    OST-R Research Roundup Newsletter: May 2024
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2024-05-01 | OST-R Research Roundup | PDF
    News from across OST-R and its research community.
  • Modeling Pedestrian and Bicyclist Crash Exposure with LocationBased Service Data
    Modeling Pedestrian and Bicyclist Crash Exposure with Location-Based Service Data
    Nam, Yunwoo ;
    Hawkins, Jason
    2024-05-01 | PDF
    The rising popularity of non-motorized transportation has brought about safety risks. The inclusion of accurate traffic volume information is one of the key elements to produce robust outcomes when researching safety. The project investigates and enhances transportation safety for pedestrians and bicyclists, emphasizing the integration of Location- ...
  • Smart Work Zone Control and Performance Evaluation Based on Trajectory Data
    Smart Work Zone Control and Performance Evaluation Based on Trajectory Data
    Xie, Yuanchang ;
    Bhuyan, Zubin
    2024-05-01 | PDF
    Work zone control strategies, such as taper length and transverse rumble strips, have the potential to significantly impact traffic operations and safety. The performance of these strategies is often evaluated based on traffic throughput, time headway, speed, and travel time measured at multiple locations or over a segment. Such metrics do not prov ...
  • Traffic Safety Facts 2022 Data Occupant Protection in Passenger Vehicles
    Traffic Safety Facts 2022 Data: Occupant Protection in Passenger Vehicles
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-05-01 | PDF
    According to the National Highway Traffic Safety Administration’s 2022 National Occupant Protection Use Survey, the estimated seat belt use rate over the decade 2013 to 2022 increased from 87.2 percent in 2013 to 91.6 percent in 2022. There were 42,514 traffic fatalities in the United States in 2022, of which 25,420 (60%) were occupants of passenge ...
  • Engineering Design Procedures and Standard Drawings for Highway Construction Sediment Basins
    Engineering Design Procedures and Standard Drawings for Highway Construction Sediment Basins
    Schwartz, John S ;
    Smith, Payton M.
    2024-05-01 | PDF
    Stormwater discharges from highway construction that disturb soil greater than five acres are permitted by the Tennessee Department of Environment and Conservation (TDEC) where runoff sediment must be controlled meeting General Permit (TNR100000) requirements including development and submittal of a Stormwater Pollution Prevention Plan (SWPPP). Wit ...
  • Feasibility of Implementing Pedestrian Hybrid Beacon PHB Signals for Improving Safety and Mobility in Nevada
    Feasibility of Implementing Pedestrian Hybrid Beacon (PHB) Signals for Improving Safety and Mobility in Nevada
    Kimley-Horn and Associates, Inc.  ...
    2024-05-01 | PDF
    Pedestrian safety has been a major concern throughout the 140-year history of the automobile, resulting in the development of numerous safety treatment options for mid-block pedestrian crossings. These include several types of beacons and signals. Some of these devices use flashing yellow beacons to alert motorists to pedestrian presence, while oth ...
  • Addressing Multimodal Transportation Needs through Complete Streets Implementation
    Addressing Multimodal Transportation Needs through Complete Streets Implementation
    Stavropoulou, Eirini ;
    Stamatiadis, Nikiforos
    2024-05-01 | PDF
    Since the early 2000s, over 1,600 transportation agencies in the United States have adopted Complete Streets policies. Recently, the Kentucky Transportation Cabinet (KYTC) published its Complete Streets, Roads, and Highways Manual, which aims to implement a safe and equitable transportation system throughout the state, as well as a Complete Streets ...
  • Calibrating the Highway Safety Manual Predictive Methods for Texas Highways Technical Report 5708301R1
    Calibrating the Highway Safety Manual Predictive Methods for Texas Highways: Technical Report [5-7083-01-R1]
    Geedipally, Srinivas R. ;
    Pratt, Michael P.
    2024-05-01 | PDF
    The Highway Safety Manual (HSM) contains safety performance functions (SPFs) that are used in project-level decision-making to estimate the average crash frequency by severity level for existing conditions, alternatives to existing conditions, or proposed new roadways. Because most existing HSM SPFs were developed for states other than Texas, SPF c ...
  • Recommendations for the Implementation of Heavy Fleet Routes and Facilities Location Optimization
    Recommendations for the Implementation of Heavy Fleet Routes and Facilities Location Optimization
    Dunlop, Steven R ;
    Brady, Thomas
    2024-05-01 | PDF
    This study's main objective was to enhance the efficiency of winter salting operations for the Indiana Department of Transportation (INDOT) through the following objectives. The first aim was to optimize the routing of salting vehicles from current facility locations to assigned road segments. The second and more pivotal objective was to identify t ...
  • Probabilistic Approach for Design of Drilled Shafts Socketed in Weak Rock in Oklahoma
    Probabilistic Approach for Design of Drilled Shafts Socketed in Weak Rock in Oklahoma
    Loehr, J. Erik ;
    Boeckmann, Andrew
    2024-05-01 | PDF
    This report documents the conduct and findings of a research program undertaken to evaluate alternative methods for design of drilled shafts founded in weak rock in Oklahoma, and to develop probabilistically calibrated resistance factors to achieve a target design reliability for recommended design methods. The report documents important background ...
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