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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 2081 - 2100 of 36114 results
  • Determining Asphalt Mixture Properties Using Imaging Techniques
    Determining Asphalt Mixture Properties Using Imaging Techniques
    Notani, Mohammad Ali ;
    Jahangiri, Behnam
    2023-04-01 | PDF
    This study introduces imaging technology to determine the bulk specific gravity (Gmb) of compacted asphalt mixture specimens. Using an advanced three-dimensional scanner, a fast, accurate technique for determining compacted asphalt mixture specimen Gmb was developed. The feasibility of this technique was evaluated by testing a collection of asphalt ...
  • Quantifying Impacts of the COVID19 Pandemic on Ridership of CTA Rail and Bus Systems in Chicago
    Quantifying Impacts of the COVID-19 Pandemic on Ridership of CTA Rail and Bus Systems in Chicago
    Liu, Yining ;
    Osorio, Jesus J.
    2023-04-01 | PDF
    This study’s research team conducted a comprehensive statistical analysis to help transit agencies better understand factors that may have contributed to transit ridership loss and the extent of its impacts. Building off ICT-IDOT project R27-SP45, they developed a series of statistical models for the Chicago Transit Authority’s rail and bus systems ...
  • How Regional Transit Agencies Can Serve the Daily Mobility Needs of the Unhoused Population
    How Regional Transit Agencies Can Serve the Daily Mobility Needs of the Unhoused Population
    Nations, Jennifer ;
    Fu, Yao
    2023-04-01 | PDF
    With more people experiencing homelessness in California cities, some transit agencies have begun to comprehensively address the needs of people experiencing homelessness, a population which historically may not have been included in their planning. Research suggests that people experiencing homelessness rely on public transit for the same variety ...
  • Overview of Motor Vehicle Traffic Crashes in 2021
    Overview of Motor Vehicle Traffic Crashes in 2021
    Stewart, Timothy
    2023-04-01 | PDF
    This technical report provides an overview of motor vehicle traffic crashes in 2021. There were 42,939 people killed in motor vehicle traffic crashes on U.S. roadways during 2021, a 10-percent increase from 39,007 fatalities in 2020, or 3,932 more people killed in traffic crashes in 2021. The estimated number of people injured on our roadways incre ...
  • The Future of the Louisiana Waterways Transport System A System Analysis and Plan to Move Commerce by Water Tech Summary
    The Future of the Louisiana Waterways Transport System: A System Analysis and Plan to Move Commerce by Water [Tech Summary]
    Cruz, Ricardo ;
    Mitran, Elisabeta
    2023-04-01 | PDF
    To be able to develop this plan with a capability of providing a level of planning and forecasting guidance, it is necessary to identify the type and value of waterborne commerce, thereby providing the focus for the analysis and documentation of the impact and importance of waterborne commerce on the state of Louisiana, its transportation system, a ...
  • Automated Safety Assessment of Rural Roadways Using Computer Vision
    Automated Safety Assessment of Rural Roadways Using Computer Vision
    Mashhadi, Ali Hassandokht ;
    Rashidi, Abbas
    2023-04-01 | PDF
    Roadside elements play an important role in the number and severity of crashes. Rigid obstacles (trees, rocks, embankments, etc.), guardrails, clear zones, and side slopes are among the factors that might affect roadside safety. The Federal Highway Administration (FHWA) presented a rating system to help DOTs and transportation agencies make better ...
  • Functional Characteristics of DenseGraded Asphalt Surface Mixtures
    Functional Characteristics of Dense-Graded Asphalt Surface Mixtures
    Boz, Ilker ;
    Flintsch, Gerardo W
    2023-04-01 | PDF
    This study assessed the short-term functional (surface) characteristics of pavements constructed using dense-graded asphalt surface mixtures designed with the balanced mix design (BMD) methodology as compared to counterpart mixtures designed using the existing design methodology (Superpave). Another objective of this study was to establish a functi ...
  • Transverse Rumble Strips at Rural Intersections
    Transverse Rumble Strips at Rural Intersections
    Hallmark, Shauna ;
    Oneyear, Nicole
    2023-04-01 | PDF
    As a low-cost countermeasure to rural intersection crashes, transverse rumble strips (TRS) provide an audible and tactile warning to drivers approaching an intersection with the primary goal of decreasing crashes that result from running a stop sign. The objective of this project is to evaluate the effectiveness of different TRS patterns on stoppin ...
  • Financing the Future Examining the Fiscal Landscape of California Public Transit in the Wake of the Pandemic
    Financing the Future: Examining the Fiscal Landscape of California Public Transit in the Wake of the Pandemic
    Wasserman, Jacob L. ;
    Gahbauer, John
    2023-04-01 | PDF
    California and its regional and local governments have invested heavily in public transit over the past half-century to provide an alternative to driving, ease traffic congestion, reduce emissions, slow climate change, steer new development, and provide mobility for those without. As a result, bus service has improved and expanded, and many parts o ...
  • Snow Depth Retrieval with an Autonomous UAVMounted SoftwareDefined Radar
    Snow Depth Retrieval with an Autonomous UAV-Mounted Software-Defined Radar
    Prager, Samuel ;
    Sexstone, Graham
    2023-04-01 | PDF
    We present results from a field campaign to measure seasonal snow depth at Cameron Pass, Colorado, using a synthetic ultrawideband software-defined radar (SDRadar) implemented in commercially available Universal Software Radio Peripheral (USRP) software-defined radio hardware and flown on a small hexacopter unmanned aerial vehicle (UAV). We coheren ...
  • The Future of the Louisiana Waterways Transport System A System Analysis and Plan to Move Commerce by Water
    The Future of the Louisiana Waterways Transport System: A System Analysis and Plan to Move Commerce by Water
    Cruz, Ricardo ;
    Hird, Jonathan
    2023-04-01 | PDF
    Moving commerce by water represents 25 percent of all goods movements within the state of Louisiana and is a critical component of the multimodal transportation system in the state [1]. To be best positioned for future development and investment, the Louisiana Department of Transportation and Development's (DOTD) Office of Multimodal Commerce (OMC) ...
  • Best Practices for Historic Masonry Repair and Rehabilitation
    Best Practices for Historic Masonry Repair and Rehabilitation
    Miller, Ann B.
    2023-04-01 | PDF
    The most recently published update of the Virginia Department of Transportation’s (VDOT’s) historic bridge management plan, A Management Plan for Historic Bridges in Virginia: The 2017 Update, noted a number of special considerations regarding stone masonry on VDOT’s historic bridges (i.e., those state-owned bridges that are individually eligible f ...
  • Enhancing Managed Lanes Equity Analysis
    Enhancing Managed Lanes Equity Analysis
    Douma, Frank ;
    Fonseca-Sarmiento, Camila
    2023-04-01 | PDF
    Planning and environmental studies involving managed lanes still have difficulty determining how to effectively evaluate project alternatives from an equity perspective. To most people, “equity” is ubiquitous with income, but this is a narrow focus that limits the scope of what can be considered equity, and indeed this can be true when it comes to ...
  • Bats Use of Bridges and Culverts
    Bats Use of Bridges and Culverts
    Wetzel, Theresa ;
    Roby, Piper
    2023-04-01 | PDF
    Bats are found on every continent except Antarctica and play a crucial role in our ecosystems from pollination to pest control to seed dispersal. Although bats use natural roosts such as trees and caves, many species also use anthropogenic roosts such as buildings and transportation structures. Because of this, a growing number of transportation de ...
  • Evaluating Total Maximum Daily Load Pollutants from ADOTs Storm Sewer System Discharges
    Evaluating Total Maximum Daily Load Pollutants from ADOT’s Storm Sewer System Discharges
    Sydnor, Rebecca ;
    Garman, Jay
    2023-04-01 | PDF
    In accordance with the requirements of the Clean Water Act, discharges from municipal separate storm sewer systems (MS4s) to the waters of the U.S. are regulated for pollutants. ADOT holds an MS4 permit and is therefore responsible for the quality of water discharged from its storm sewer system. ADOT is currently named as a contributor of the pollu ...
  • StateofthePractice Review of FieldCuring Methods for Evaluating the Strength of Concrete Test Specimens
    State-of-the-Practice Review of Field-Curing Methods for Evaluating the Strength of Concrete Test Specimens
    Solanki, Pranshoo ;
    Xie, Haiyan (Sally)
    2023-04-01 | PDF
    The American Association of State Highway and Transportation Officials (AASHTO) T 23 standard provides instructions for making and curing concrete test specimens in the field. However, further research is needed to compare the strength of the field-cured specimen with the strength of the actual in-place concrete item. The purpose of this research i ...
  • Multisource Data Fusion for RealTime and Accurate Traffic Incident Detection via Predictive Analytics
    Multisource Data Fusion for Real-Time and Accurate Traffic Incident Detection via Predictive Analytics
    Stamatiadis, Polichronis ;
    Gartner, Nathan H.
    2023-04-01 | PDF
    The objectives of this study are to (1) identify data sets available to MassDOT that can be used for realtime incident detection; (2) investigate how data from different sources can be integrated to improve incident detection; and (3) develop guidance for establishing trigger points to alert Highway Operations Center (HOC) operators about incidents ...
  • Guidelines for Determining Speed Limits on Municipal Roadways
    Guidelines for Determining Speed Limits on Municipal Roadways
    Miner, Kate ;
    Arvidson, Tim
    2023-04-01 | PDF
    The issue of reducing speed limits to increase public safety is an emotional, political, and controversial topic that has been debated by safety advocates, engineers, politicians, transportation ofcials, and the public for many years. A recent statutory change has put a spotlight on the topic, necessitating a deeper look into how speed limits are e ...
  • Using Mycofiltration Treatment for Stormwater Management
    Using Mycofiltration Treatment for Stormwater Management
    Kennen, Kate ;
    Chadderton, Colin
    2023-04-01 | PDF
    Federal and State environmental regulations require transportation construction and retrofit projects to manage stormwater and improve water quality. MassDOT has legal, financial, and ecological obligations to mitigate pollution from stormwater runoff entering water bodies. Existing green and gray infrastructure in place across the Commonwealth is ...
  • Incorporating Crash Severity and Continuous Improvement of SHIFT
    Incorporating Crash Severity and Continuous Improvement of SHIFT
    Souleyrette, Reginald ;
    Tanzen, Riana
    2023-04-01 | PDF
    The Strategic Highway Investment Formula for Tomorrow (SHIFT) is the Kentucky Transportation Cabinet's data-informed approach for comparing capital improvement projects and prioritizing limited transportation funds. SHIFT 2022 incorporates advancements in methods and flexibility. This project revises the SHIFT crash data safety metric. The crash da ...
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