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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 941 - 960 of 36104 results
  • Safe Truck Mobility for North Dakota Winter Roads
    Safe Truck Mobility for North Dakota Winter Roads
    Zhou, Yun ;
    Vachal, Kimberly
    2024-09-01 | PDF
    Winter storms significantly increase crash risk and disrupt travel, especially under extreme conditions. Gusty winds, heavy moisture, and low temperatures can quickly make travel dangerous in the Northern Plains. This study was aimed at understanding winter truck crashes, given the prominence of commercial vehicle travel in the region’s economy. Tr ...
  • Use of Drilling Parameters for Enhancing Geotechnical Site Investigations with Applications to Rock Assessment
    Use of Drilling Parameters for Enhancing Geotechnical Site Investigations with Applications to Rock Assessment
    Benoit, Jean ;
    Souza, Bruma
    2024-09-01 | PDF
    This report summarizes the research conducted using Measurement While Drilling (MWD) technology that was recently implemented as part of routine geotechnical investigations conducted by the New Hampshire Department of Transportation (NHDOT). MWD is a system that consists of several sensors directly mounted or connected to a drill rig to monitor all ...
  • ActivityBased Model Implementation and Analysis Considerations
    Activity-Based Model Implementation and Analysis Considerations
    Macfarlane, Gregory S ;
    Atchley, Hayden
    2024-09-01 | PDF
    Tour-based and activity-based travel demand models are generally considered more theoretically robust compared to their trip-based counterparts, as activity-based models (ABMs) explicitly model individuals making travel choices in contrast to the aggregate nature of trip-based models. There have been a number of comparisons between trip- and activi ...
  • Lessening Density Requirement and Adjusting Density Pay Factors for Asphalt Pavements in Poor Sublayer Conditions
    Lessening Density Requirement and Adjusting Density Pay Factors for Asphalt Pavements in Poor Sublayer Conditions
    Kang, Kyubyung ;
    Lee, Jinwoong
    2024-09-01 | PDF
    Current quality control and quality assurance practices for asphalt pavements rely heavily on density (%Gmm) measurements, which are directly linked to pay adjustments. However, these practices can inadvertently encourage over-compaction, leading to issues such as aggregate segregation, crushing, and reduced pavement quality, especially under poor ...
  • Effect of Roadway Lighting on Safety
    Effect of Roadway Lighting on Safety
    Runyan, Samuel L ;
    Bassett, David
    2024-09-01 | PDF
    A significant portion of severe crashes and severe crashes involving vulnerable road users (VRU), 29 percent and 39 percent respectively, occur at night in Utah. Nighttime crash causes are less understood than daytime crashes as there are fewer nighttime crashes, but it is generally assumed that increasing street lighting can help mitigate these cr ...
  • Truck Education and Outreach Partnership for North Dakota
    Truck Education and Outreach Partnership for North Dakota
    Peterson, Del ;
    Bengtson, Kelly
    2024-09-01 | PDF
    The project objectives were as follows: • Objective 1. Engage traditional and new stakeholders in a partnership to increase public awareness and deliver continuous education to prevent large truck crashes in a state truck education and outreach partnership (ND TE-OP). The notion of a TOL would be explored as a facet in the sustained partnership. Th ...
  • Development of Age and State Dependent Stochastic Model for Improved Bridge Deterioration Prediction Brief
    Development of Age and State Dependent Stochastic Model for Improved Bridge Deterioration Prediction [Brief]
    Jia, Gaofeng ;
    Li, Min
    2024-09-01 | PDF
    Reliable and accurate assessment and prediction of bridge condition deterioration is critical for effective bridge preservation. Deterioration models, combined with current condition information, can guide inspection, maintenance, repair, and rehabilitation planning, and support risk and life-cycle analysis. Existing Markov deterioration models, wh ...
  • Grand Forks East Grand Forks Regional ITS Architecture Update Version 50
    Grand Forks - East Grand Forks Regional ITS Architecture Update: Version 5.0
    Hasan, MD Sharijad
    2024-09-01 | PDF
    The Grand Forks-East Grand Forks Regional Intelligent Transportation Systems (ITS) Architecture was developed under the leadership of the Grand Forks-East Grand Forks Metropolitan Planning Organization (GF-EGF MPO). This architecture has been updated three times since its original development—in 2008, 2014, and 2019. The goal of the GF-EGF regional ...
  • Roadway Cross Section Reconfiguration Responses to 14 Commonly Asked Questions
    Roadway Cross Section Reconfiguration: Responses to 14 Commonly Asked Questions
    Knapp, Keith ;
    Veneziano, David
    2024-09-01 | PDF
    The project described in this report was developed in response to a documented need for more readily available guidance related to decision-making about roadway cross section reconfigurations. More specifically, there was a need for information that might help during the decision-making process involved in converting four-lane undivided roadway cro ...
  • A Preliminary EvidenceBased Approach for Forecasting Cut Slope Deterioration
    A Preliminary Evidence-Based Approach for Forecasting Cut Slope Deterioration
    Werley, Keara ;
    Walton, Gabriel
    2024-09-01 | PDF
    Constructed rock slopes may physically deteriorate over time, which can be represented with increasing rockfall frequency. Physical deterioration leads to performance deterioration, which corresponds to changes in slope risk through time. Thus, forecasting physical slope deterioration and therefore slope performance deterioration is critical to the ...
  • Impact of Imperfections Residual Stresses Erection FitUp and Distortion on Curved Steel Bridge Service Life
    Impact of Imperfections, Residual Stresses, Erection Fit-Up and Distortion on Curved Steel Bridge Service Life
    Hammett, Stephen T ;
    Moghadam, Sayed Mohamad Jalali
    2024-09-01 | PDF
    Curved steel girders experience large deflection and rotations during construction and service that can intensify the web breathing effect. In addition, the curvature-induced lateral forces in slender curved webs can lead to critical web boundary stresses that do not typically occur in straight bridges. These distortion mechanisms are amplified by ...
  • Evaluating Sedimentation Impacts to Freshwater Mussels Research Summary
    Evaluating Sedimentation Impacts to Freshwater Mussels [Research Summary]
    Baolin, Deng
    2024-09-01 | PDF
    This project was to 1) evaluate the impacts of suspended solids on juvenile mussels, 2) assess the effects of sediment deposition on adult and subadult mussels, 3) develop a particle tracking model, and 4) evaluate the existing and potential mitigation approaches for mussel protection. The comprehensive research included a literature review, a Depa ...
  • LowShrinkage UltraHighPerformance Concrete Summary
    Low-Shrinkage Ultra-High-Performance Concrete [Summary]
    Aljawad, Yasmeen ;
    Lequesne, Remy D.
    2024-09-01 | PDF
    Ultra-high-performance concrete (UHPC) has been used increasingly in the past decade due to its high strength, rapid strength gain, and enhanced durability. UHPC is a cement-based material that typically has a low w/cm ratio, high paste content, and a 2% volume fraction of 0.5-in. long, straight, high-strength steel fibers. Most commercially availa ...
  • LowShrinkage UltraHighPerformance Concrete
    Low-Shrinkage Ultra-High-Performance Concrete
    Aljawad, Yasmeen ;
    Lequesne, Remy D.
    2024-09-01 | PDF
    Ultra-high-performance concrete (UHPC) has been used increasingly in the past decade due to its high strength, rapid strength gain, and enhanced durability. UHPC is a cement-based material that typically has a low w/cm ratio, high paste content, and a 2% volume fraction of 0.5-in. long, straight, high-strength steel fibers. Most commercially availa ...
  • Traffic Safety Facts 2022 Data Summary of Motor Vehicle Traffic Crashes
    Traffic Safety Facts 2022 Data: Summary of Motor Vehicle Traffic Crashes
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-09-01 | PDF
    In 2022 there were an estimated 5,930,496 police-reported traffic crashes in which 42,514 people were killed and an estimated 2,382,771 people were injured. Compared to 2021 there was a 1.7-percent decrease in the number of traffic fatalities, and a 4.6-percent decrease in the estimated number of people injured in 2022. The estimated number of poli ...
  • Traffic Safety Facts 2022 Data State Traffic Data
    Traffic Safety Facts 2022 Data: State Traffic Data
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-09-01 | PDF
    Traffic fatalities in the United States decreased by 1.7 percent from 2021 to 2022 (43,230 to 42,514). The fatality rate per 100 million vehicle miles traveled (VMT) was 1.33 in 2022, ranging from a high of 1.85 to a low of 0.69 among States. The fatality rate per 100 million VMT in the United States decreased by 3.6 percent (1.38 to 1.33) from 202 ...
  • OSTR Research Roundup September 2024
    OST-R Research Roundup: September 2024
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2024-09-01 | OST-R Research Roundup | PDF
    News from across OST-R and its research community.
  • Effectiveness of Automated Pavement Restriping Systems Phase I Cost Comparison Between Manual and Automated Systems Summary
    Effectiveness of Automated Pavement Restriping Systems, Phase I: Cost Comparison Between Manual and Automated Systems [Summary]
    Schrock, Steven D. ;
    Liu, Lanxi
    2024-09-01 | PDF
    The Kansas Department of Transportation (KDOT) is interested in finding a more efficient and accurate restriping system than the current system in use in order to save costs and/or accomplish the same work using fewer field personnel. Therefore, this report details the potential financial advantages for KDOT to deploy an automated pavement restripi ...
  • Motorcycle Helmet Use in 2023 Overall Results Traffic Safety Facts Research Note
    Motorcycle Helmet Use in 2023 – Overall Results [Traffic Safety Facts - Research Note]
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-09-01 | PDF
    Use of DOT-compliant motorcycle helmets was 73.8 percent in 2023, not statistically different at the 0.05 level from 66.5 percent in 2022. The 2023 estimate is the highest ever recorded. The 2023 data collection occurred during the usual timeframe of early June, immediately following the Click It or Ticket campaign. There were 945 motorcyclists obs ...
  • Traffic Safety Facts CrashStats Early Estimate of Motor Vehicle Traffic Fatalities for the First Half JanuaryJune of 2024
    Traffic Safety Facts Crash-Stats: Early Estimate of Motor Vehicle Traffic Fatalities for the First Half (January–June) of 2024
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-09-01 | PDF
    A statistical projection of traffic fatalities for the first half of 2024 shows an estimated 18,720 people died in motor vehicle traffic crashes, a decrease of about 3.2 percent compared to 19,330 fatalities projected for the first half of 2023 (Early Estimate of Motor Vehicle Traffic Fatalities in 2023, Report No. DOT HS 813 561), as shown in Tabl ...
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