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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 1941 - 1960 of 36114 results
  • Assessment of Motorcycle Safety in Wyoming Fatal and Severe Crashes Contributing Factors and Potential Countermeasures Addendum
    Assessment of Motorcycle Safety in Wyoming: Fatal and Severe Crashes, Contributing Factors and Potential Countermeasures [Addendum]
    Zlatkovic, Milan ;
    Baah, Isaac
    2023-06-01 | PDF
    Motorcycle riders and passengers are much more likely to be killed or severely injured in a crash, and on average about 15 percent of all traffic fatalities include motorcyclists. Motorcyclists and their passengers are particularly vulnerable on the roads, which accounts for their higher percentage of fatal and severe crash accidents. To take appro ...
  • Assessing Stormwater Infrastructure Capacity for Severe Storms Summary
    Assessing Stormwater Infrastructure Capacity for Severe Storms [Summary]
    Brenna, Erik ;
    Gulliver, John S.
    2023-06-01 | PDF
    MnDOT maintains a significant portion of the state’s storm- water infrastructure. Managing stormwater is important to pre-vent flooding and associated safety risks; impacts to the environ-ment; and damage to property, roads and bridges.
  • Impact of Speed Limit Changes on Urban Streets
    Impact of Speed Limit Changes on Urban Streets
    Davis, Gary A.
    2023-06-01 | PDF
    In 2019 the Minnesota Legislature amended that state’s statutes to allow cities to set speed limits on city-owned streets. In February 2021 the authors surveyed 33 cities within the Twin Cities metro area and identified the city of St. Louis Park as planning to implement a city-wide change in speed limits, with a default speed limit of 20 mph but w ...
  • Deployment of a Snowplow DriverAssist System
    Deployment of a Snowplow Driver-Assist System
    Davis, Brian ;
    Schwieters, Katelyn
    2023-06-01 | PDF
    Snowplow operators are often tasked with clearing snow from roadways under challenging conditions. One such situation is low visibility due to falling or blowing snow that makes it difficult to navigate, stay centered in the lane, and identify upcoming hazards. To support snowplow operators working in these conditions, University of Minnesota resea ...
  • Traffic Safety Facts 20122021 Data SchoolTransportationRelated Crashes
    Traffic Safety Facts 2012-2021 Data: School-Transportation-Related Crashes
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2023-06-01 | National Transportation Statistics (NTS) | PDF
    A school-transportation-related crash is a motor vehicle traffic crash that directly or indirectly involves a school transportation vehicle that is either a school bus body type or a non-school-bus functioning as a school bus, transporting children to and from school or school-related activities. For the purposes of this fact sheet, school-age chil ...
  • Screening of Asphalt Extenders and Recycling Agents
    Screening of Asphalt Extenders and Recycling Agents
    Castorena, Cassie ;
    Fried, Andrew
    2023-06-01 | PDF
    The objectives of this project are to: 1) develop recommendations for extender and recycling agent product approval and dosage selection; and 2) identify appropriate aging procedure(s) to simulate long-term oxidative aging coupled with test methods and parameters to characterize the cracking resistance of asphalt binders. Three NCDOT approved surfa ...
  • Analysis of Local Bus Markets Phase III Technical Brief
    Analysis of Local Bus Markets, Phase III [Technical Brief]
    Deka, Devajyoti ;
    Carnegie, Jon A.
    2023-06-01 | PDF
    Despite having an extensive network of public transit, traffic congestion and transportation-related greenhouse gas (GHG) emissions are significant concerns in New Jersey. This research examines the GHG impacts of NJ TRANSIT local buses in the greater Newark area service region. It involved a large-scale onboard survey of bus riders on 40 NJ TRANSI ...
  • Increasing Support for Innovative Traffic Solutions Summary
    Increasing Support for Innovative Traffic Solutions [Summary]
    Thompson, Scott ;
    Morris, Nichole
    2023-06-01 | PDF
    Public transportation agencies are constantly on the lookout for ways to reduce the number and severity of traffic crashes. One such solution is the Restricted Crossing U-turn, or RCUT, which has proven to be a safer alternative to traditional intersections on four-lane divided highways.
  • 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 ...
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