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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 781 - 800 of 35815 results
  • Modeling Road Construction Air Quality Impacts
    Modeling Road Construction Air Quality Impacts
    Walker, Curtis ;
    Juliana, Timothy
    2024-10-01 | PDF
    Understanding construction emissions and their impacts to air quality is a shared responsibility. The Colorado Department of Transportation (CDOT) and the Colorado Department of Public Health and Environment (CDPHE) have pooled resources to better quantify and understand the influence of construction activities on air quality. The objective of this ...
  • HighMast Tower Foundation Phase II
    High-Mast Tower Foundation – Phase II
    Al Maabreh, Ammar ;
    Awawdeh, Abdelrahman
    2024-09-30 | PDF
    Challenge: High-mast luminaire supports used in the US transportation sector are typically steel poles that are attached to a baseplate via a butt or socket weld. Many have failed primarily due to fatigue cracking at the weld toe. Significant research in the US improved the fatigue performance of these structures; however, failures still occur due ...
  • Use of Geothermal Energy for DeIcing Approach Pavement Slabs and Bridge Decks Phase II Project Summary Report
    Use of Geothermal Energy for De-Icing Approach Pavement Slabs and Bridge Decks – Phase II [Project Summary Report]
    Yu, Xinbao ;
    Puppala, Anand J.
    2024-09-30 | PDF
    The research team developed and optimized a geothermal bridge deck deicing system that can be installed onto in-service bridges through retrofitting. To meet the installation and bridge inspection challenges, the research team tested various bridge heating loop designs considering heating fluids (water-based vs. CO2), insulation materials (spray-on ...
  • Identification and Prioritization of Road Sections with a Relatively High Concentration of Large Wild MammalVehicle Collisions in Gallatin County Montana USA
    Identification and Prioritization of Road Sections with a Relatively High Concentration of Large Wild Mammal-Vehicle Collisions in Gallatin County, Montana, USA
    Huijser, Marcel P. ;
    Bell, Matthew A
    2024-09-30 | PDF
    The primary objective of this project is to identify and prioritize the road sections in Gallatin County that have a relatively high concentration of collisions involving large wild mammals. These road sections may then later be evaluated for potential future mitigation measures aimed at 1. Reducing collisions with large wild mammals, and 2. Provid ...
  • Setting up ROaDS Partners with Customized Surveys Final Report
    Setting up ROaDS Partners with Customized Surveys: Final Report
    Bell, Matthew ;
    Kack, David
    2024-09-30 | PDF
    The Roadkill Observation and Data System (ROaDS) project, developed through a partnership between the U.S. Fish and Wildlife Service, National Park Service, and the Western Transportation Institute at Montana State University, provides a user-friendly data collection system to monitor wildlife-vehicle collisions (WVCs) and identify safe crossing lo ...
  • Engaging Community Partners and Youth To Enhance and Sustain Safe Routes to Schools
    Engaging Community Partners and Youth To Enhance and Sustain Safe Routes to Schools
    MacFarlane, Jennifer ;
    Kack, David
    2024-09-30 | PDF
    Safe Routes to School programs increase the number of children who walk and bike to school. By building pedestrian skills at a young age, students are more likely to choose active transportation modes across their lifespan, therefore decreasing vehicle miles traveled, reducing vehicle emissions, preventing chronic disease, and improving physical he ...
  • Patterns of Domestic AnimalVehicle Collisions on Tribal Lands in Montana US
    Patterns of Domestic Animal-Vehicle Collisions on Tribal Lands in Montana, U.S.
    Bell, Matthew ;
    Huijser, Marcel P.
    2024-09-30 | PDF
    Animal-vehicle collisions (AVCs) are a significant concern for motorist safety and pose a risk to both wildlife and domestic animals. This report analyzes spatial patterns of wildlife-vehicle collisions (WVCs) and domestic animal-vehicle collisions (DAVCs) on Montana’s tribal lands to identify high-risk areas and inform mitigation strategies. Data ...
  • Evaluating Electrical Resistivity as a Procedure to Aid in Characterizing Subsurface Conditions
    Evaluating Electrical Resistivity as a Procedure to Aid in Characterizing Subsurface Conditions
    Barger, Michelle ;
    Immel, Grace
    2024-09-30 | PDF
    The Iowa DOT Soils Design section participated in the Demonstration Stage of the Advanced Geotechnical Exploration Methods (A-GaME) initiative. The A-GaME initiative sought to promote the use of advanced geotechnical methods as a means to reduce cost in subsurface investigation. One of the proven geophysical methods promoted is known as Electrical ...
  • Regional Sediment Bulking Methods for California in Support of Post Wildfire Flood Mitigation
    Regional Sediment Bulking Methods for California in Support of Post Wildfire Flood Mitigation
    Kondolf, G Mathias ;
    Radke, John
    2024-09-20 | PDF
    The California Department of Transportation (Caltrans) is currently searching for a methodology to determine sediment bulking specific to Northern California. In Southern California, there are specific, existing methods and equations in use by Caltrans. Due to increased wildfire occurrence and severity in northern and southern California, a regiona ...
  • Convex Reformulation of Information Constrained Linear State Estimation with MixedBinary Variables for Outlier Accommodation
    Convex Reformulation of Information Constrained Linear State Estimation with Mixed-Binary Variables for Outlier Accommodation
    Hu, Wang ;
    Jiang, Zeyi
    2024-09-13 | PDF
    This article considers the challenge of accommodating outlier measurements in state estimation. The Risk-Averse Performance-Specified (RAPS) state estimation approach addresses outliers as a measurement selection Bayesian risk minimization problem subject to an information accuracy constraint, which is a non-convex optimization problem. Prior explo ...
  • Reduce Fatal Serious Injury Crashes
    Reduce Fatal & Serious Injury Crashes
    Kurkcu, Abdullah ;
    Deutsch, Paul
    2024-09-04 | PDF
    There is an urgency to initiate innovative approaches to transportation safety to reduce traffic fatalities and serious injuries in South Dakota. Therefore, the South Dakota Department of Transportation is exploring the implementation of a zero-fatality transportation safety initiative. A literature review of national strategies and relevant polici ...
    Supporting Files
  • 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 ...
  • 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 ...
  • 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 ...
  • Use of Titanium Alloy Reinforcement to Strengthened Bridges in Alabama Laboratory Testing and Analytical Investigations
    Use of Titanium Alloy Reinforcement to Strengthened Bridges in Alabama: Laboratory Testing and Analytical Investigations
    Islam, Md Aminul ;
    Flowers, Jack C
    2024-09-01 | PDF
    This report presents findings from a comprehensive study evaluating the feasibility of using Near-Surface-Mounted (NSM) Titanium Alloy Bars (TiAB) to strengthen structurally deficient reinforced concrete (RC) bridges in Alabama. The research aimed to provide a cost-effective, efficient solution to extend the service life of aging and strength defic ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
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