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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 1961 - 1980 of 36151 results
  • Traffic Safety Facts 2021 Data Motorcycles
    Traffic Safety Facts 2021 Data: Motorcycles
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-06-01 | PDF
    In 2021 there were 5,932 motorcyclists killed, 14 percent of all traffic fatalities. This is the highest number of motorcyclists killed since FARS started data collection in 1975. The number of motorcyclist fatalities in 2021 increased by 8 percent from 2020, from 5,506 to 5,932. An estimated 82,686 motorcyclists were injured in 2021, a 5-percent i ...
  • Identifying and Optimizing Electric Vehicle Corridor Charging Infrastructure for Medium and HeavyDuty Trucks
    Identifying and Optimizing Electric Vehicle Corridor Charging Infrastructure for Medium and Heavy-Duty Trucks
    Khani, Alireza ;
    Emami, Behnam Davazdah
    2023-06-01 | PDF
    This project studies the benefits and barriers of increased adoption of medium-duty and heavy-duty electric trucks, referred to as e-trucks, and presents a methodology for optimizing the location of e-truck charging stations in Minnesota. In general, e-trucks provide zero tailpipe emissions and lower operating and maintenance costs. However, some b ...
  • Evaluating MnDOTs Turfgrass Seed Variety List and Approval Process Technical Summary
    Evaluating MnDOT’s Turfgrass Seed Variety List and Approval Process [Technical Summary]
    Watkins, Eric
    2023-06-01 | PDF
    This project addresses two critical needs: to update existing Minnesota Department of Transportation (MnDOT) turfgrass recommendation lists and to develop a new process to keep lists continually updated in a fair manner with data-driven recommendations. The authors evaluated the current list of MnDOT-approved turfgrass varieties and found underperf ...
  • Simplified Analysis Methods of TSD and FWD Data for Effective Pavement Preservation Program
    Simplified Analysis Methods of TSD and FWD Data for Effective Pavement Preservation Program
    Kassem, Emad ;
    Muftah, Ahmed
    2023-06-01 | PDF
    Pavement evaluation is critical for determining proper and cost-effective surface treatments and allocation of limited funds and resources to maintain, rehabilitate and reconstruct flexible pavements. This study examined two nondestructive testing devices that are used to evaluate the structural capacity and integrity of highway pavements including ...
  • Environment for Testing and Assessing Infrastructure Support of Connected Vehicle and Cooperative Highway Automation Applications
    Environment for Testing and Assessing Infrastructure Support of Connected Vehicle and Cooperative Highway Automation Applications
    Hadi, Mohammed ;
    Mata, Hector
    2023-06-01 | PDF
    The consideration of cooperative driving automation (CDA) in the transportation system management and operations (TSM&O ) processes has the potential for improving system performance in terms of safety, mobility, environmental impacts, and user satisfaction and acceptance. The goal of this project is to provide recommendations regarding the incorpo ...
  • Assessing the Economic Impact of Speed Limit Changes on Safety and Mobility in California
    Assessing the Economic Impact of Speed Limit Changes on Safety and Mobility in California
    Musabbir, Sarder Rafee ;
    Zhang, Michael
    2023-06-01 | PDF
    This project estimates the safety and mobility impact of changing speed limits on California highways. The safety impact is estimated using statistical models to predict the change in the frequency of all crashes and fatal-or-severe crashes that would result by varying the design speed (85th percentile speed). Statewide crash and traffic data (from ...
  • Effect of Fillers on the Moisture Resistance and Performance of HMA Research Project Capsule 231B
    Effect of Fillers on the Moisture Resistance and Performance of HMA: Research Project Capsule [23–1B]
    Elseifi, Mostafa ;
    Rupnow, Tyson
    2023-06-01 | PDF
    The main objectives of the proposed study are two-fold: 1. To evaluate the effects of various types of inert and active fillers on the moisture resistance and laboratory performance of asphalt mixtures. 2. To propose change to the specifications to optimize the use of mineral fillers in hot-mix asphalt (HMA).
  • Using Rumble Strips to Encourage Stops at Rural Intersections
    Using Rumble Strips to Encourage Stops at Rural Intersections
    Hallmark, Shauna
    2023-06-01 | PDF
    Transverse rumble strips (TRS), which run across a traffic lane, are a low-cost and easily deployable safety countermeasure for intersection approaches. Grooved into the pavement or installed as ridges on the surface, rumble strips provide an audible and tactile warning to drivers and are effective in all conditions but particularly when it’s dark ...
  • Developing Enhanced Performance Curves of ITD Asphalt Pavements by Mining the Historical Data
    Developing Enhanced Performance Curves of ITD Asphalt Pavements by Mining the Historical Data
    Deng, Yong ;
    Shi, Xianming
    2023-06-01 | PDF
    Current ITD approach to predict asphalt pavement performance over-simplifies the dynamic and nonlinear nature of pavement deterioration and fails to account for complexities in the pavement condition. As such, this project aimed to develop reliable, realistic and enhanced performance curves for ITD asphalt pavements by mining the historical data. T ...
  • Determining State and Federal Transportation Responsibilities to Residents on Islands
    Determining State and Federal Transportation Responsibilities to Residents on Islands
    Zockaie, Ali ;
    Jazlan, Farish
    2023-06-01 | PDF
    Michigan has the second-longest coastline after Alaska, with approximately 15,000 residents inhabiting the top 5 populous islands in Michigan water bodies. To provide mobility equity, the residents of these islands are expected to have equal access to work, healthcare, emergency services, and economic opportunities as the mainland residents. Four M ...
  • IRIPRAP 3D Image Analysis Software User Manual
    I-RIPRAP 3D Image Analysis Software: User Manual
    Huang, Haohang ;
    Luo, Jiayi
    2023-06-01 | PDF
    This research study introduces a new approach based on deep learning techniques that combines three developed research components: field 3D reconstruction procedures, 3D stockpiles instance segmentation, and 3D shape completion. The approach is designed to reconstruct aggregate stockpiles from multiple images, segment the stockpile into individual ...
  • Improving Ridership Projections of Proposed Bus and Rail Transit Projects to Evaluate Congestion Reduction Effects
    Improving Ridership Projections of Proposed Bus and Rail Transit Projects to Evaluate Congestion Reduction Effects
    Raida, Afrida ;
    Ohlms, Peter B.
    2023-06-01 | PDF
    Transit ridership data comprise one of the performance metrics examined when allocating funding to transportation projects, especially for those designed to reduce traffic congestion. The better the quality of the data, the more efficient the project prioritization process. The purpose of this study was to obtain better ridership data by answering ...
  • Balanced Mix Design for Surface Mixtures 2021 and 2022 Plant Mix Schedule Pilots
    Balanced Mix Design for Surface Mixtures: 2021 and 2022 Plant Mix Schedule Pilots
    Diefenderfer, Stacey D ;
    Boz, Ilker
    2023-06-01 | PDF
    Many state highway agencies are currently exploring a new approach for designing and accepting asphalt mixtures, known as the balanced mix design (BMD) method (hereinafter “BMD”). The Virginia Department of Transportation (VDOT) has made a commitment to adopt BMD to enhance the performance of asphalt mixtures. Since 2018, VDOT has taken incremental ...
  • Centerline Rumble Strip Effects on Pavement Performance
    Centerline Rumble Strip Effects on Pavement Performance
    Coleri, Erdem ;
    Chitnis, Vipul
    2023-06-01 | PDF
    Despite numerous research studies inspecting the safety benefits of CLRS on pavements, there has been limited exploration into the impact on pavement durability as a result of the installation of CLRS. The major purpose of this study was to corroborate what specific factors are controlling the cracking failures due to the installation of CLRS and f ...
  • Analytic Tools for Locating Sizing and Evaluating Electric Vehicle Charging Stations
    Analytic Tools for Locating, Sizing, and Evaluating Electric Vehicle Charging Stations
    Coenen, Steffen ;
    Aemmer, Zack
    2023-06-01 | PDF
    The Washington State Legislature directed the Department of Transportation to develop analytic tools “to enable coordinated, effective, efficient, and timely deployment of charging and refueling infrastructure necessary to support statewide and local transportation electrification efforts that result in emissions reductions” consistent with state g ...
  • Evaluating New Slurry and Plow Equipment Summary
    Evaluating New Slurry and Plow Equipment [Summary]
    Peters, Tom ;
    Hirt, Brian
    2023-06-01 | PDF
    MnDOT maintenance practitioners and managers are always looking for new and better ways to handle winter weather. To meet this need, an active winter maintenance equipment industry frequently puts forward new equipment for agencies like MnDOT to consider.
  • Evaluate the Impacts of Complete Streets Policy in Louisiana Tech Summary
    Evaluate the Impacts of Complete Streets Policy in Louisiana [Tech Summary]
    Bian, Ruijie “Rebecca”
    2023-06-01 | PDF
    The focus of this research project was to evaluate the impacts of the Complete Streets policy in Louisiana. The objectives of this research project included: (1) evaluating policy impacts to project scoping and delivery; (2) summarizing and evaluating what changes the agency has made in terms of documents, policies, staffing, training, etc. to adva ...
  • Crash Report Sampling System CRSS Motor Vehicle Crash Data Collection
    Crash Report Sampling System (CRSS): Motor Vehicle Crash Data Collection
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2023-06-01 | National Transportation Statistics (NTS) | PDF
    The National Highway Traffic Safety Administration has collected crash data since the early 1970s to support its mission to reduce motor vehicle crashes, injuries, and deaths on our Nation’s highways. The Crash Report Sampling System (CRSS) builds on the retired, long running National Automotive Sampling System General Estimates System (NASS GES). ...
  • Bigdata Analytics and Artificial Intelligence for Smart Intersections Summary
    Bigdata Analytics and Artificial Intelligence for Smart Intersections [Summary]
    Ranka, Sanjay ;
    Ponnaluri, Raj
    2023-06-01 | PDF
    This project aims to develop a multi-sensor system for vehicle and pedestrian traffic analysis at traffic intersections. The techniques developed as part of this project are used to process data streams from video-camera and LIDAR systems installed at traffic intersections (along with the loop detector data captured by advanced traffic controllers) ...
  • The Substance Abuse Professional Guidelines
    The Substance Abuse Professional Guidelines
    United States. Department of Transportation. Office of Drug and Alcohol Policy and Compliance
    2023-06-01 | PDF
    These Guidelines are provided to you by the U.S. Department of Transportation (DOT) Office of Drug and Alcohol Policy and Compliance (ODAPC). These Guidelines apply only to employers; individuals who are acting as a Substance Abuse Professional (SAP) for DOT- regulated employers; and employees subject to DOT regulation 49 CFR part 40 (Part 40) and ...
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