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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 3341 - 3360 of 36873 results
  • Best Practices and Specifications for Massive Concrete Drilled Shafts
    Best Practices and Specifications for Massive Concrete Drilled Shafts
    Stewart, Lauren K ;
    Kahn, Lawrence
    2022-02-01 | PDF
    American Concrete Institute (ACI) Guide to Mass Concrete defines massive (mass) concrete as “any volume of concrete with dimensions large enough to require that measures be taken to cope with the generation of heat from hydration of the cement and attendant volume change to minimize cracking.” Specifically, in the case of drilled shafts, Georgia De ...
  • Development of Crash Modification Factors for Speed Management of Traffic Signal Progression
    Development of Crash Modification Factors for Speed Management of Traffic Signal Progression
    Lin, Pei-Sung ;
    Wang, Zhenyu
    2022-02-01 | PDF
    This research project investigated the impacts of traffic signal progression strategy on the safety of pedestrians and bicyclists. The CUTR team used historical (crash, traffic, and roadway) data, cross-sectional study designs, and random parameter negative binomial models to estimate the effects of signal progression design on pedestrian and bicyc ...
  • Analyze Shear Capacity of Texas Standard Prestressed Beams from StrutandTie Models of Beam Ends Final Report
    Analyze Shear Capacity of Texas Standard Prestressed Beams from Strut-and-Tie Models of Beam Ends: Final Report
    Jang, Hansol ;
    Webb, Zach
    2022-02-01 | PDF
    The shear stress limit in girder end regions as established in the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications might be overly conservative for Texas standard prestressed beams. This report confirms that the shear stress limit of Texas standard pre ...
  • Estimation of Metro Freeway System Reliability and Resilience
    Estimation of Metro Freeway System Reliability and Resilience
    Kwon, Eil ;
    Jurrens, Chet
    2022-02-01 | PDF
    This study has estimated and analyzed the travel-time reliability and traffic-flow performance trends of the freeway corridors in the Twin Cities metro area of Minnesota. First, TeTRES (Travel-Time Reliability Estimation System), developed in the previous study, was enhanced by adding the estimation module of the traffic-flow performance measures f ...
    Supporting Files
  • Detecting Subsurface Voids in Roadways Using UAS with Infrared Thermal Imaging
    Detecting Subsurface Voids in Roadways Using UAS with Infrared Thermal Imaging
    Sabato, Alessandro ;
    Yu, Tzuyang
    2022-02-01 | PDF
    The failure of culverts and drainage piping underneath roadways creates sinkholes that represent a safety hazard to the traveling public and result in costly repairs and traffic inconveniences. The ability to detect voids before pavement collapse occurs is crucial for maintenance and replacement purposes. Routine inspections of culverts are hard to ...
  • Transitory Finance The Past Present and Future Fiscal Effects of COVID19 on Public Transit in Southern California
    Transit(ory) Finance: The Past, Present, and Future Fiscal Effects of COVID-19 on Public Transit in Southern California
    Wasserman, Jacob L. ;
    Rios, Nataly
    2022-02-01 | PDF
    This study reports on the recent past, present, and immediate future public transit finance in Southern California in light of the impacts of the ongoing COVID-19 pandemic. To do this, we draw on transit agency budgets, interviews, preliminary survey results, and other datasets and reports. Initially, the financial situation of transit operators in ...
  • Evaluate Opportunities to Provide Training Simulation for ODOT Snow and Ice Drivers Phase 2
    Evaluate Opportunities to Provide Training Simulation for ODOT Snow and Ice Drivers – Phase 2
    Ash, John E ;
    Ma, Jiaqi
    2022-02-01 | PDF
    Winter maintenance poses great concerns both during and after the snow and ice season. During winter, snowplow drivers must use equipment (i.e., plow trucks), each valuing up to $200,000, sometimes in severe snowstorms and unfavorable traffic conditions. This poses great safety concerns to both the plow operators and the road users. The complexity ...
  • Development of a Surface Transportation Impact Factor for Winter Severity Indices
    Development of a Surface Transportation Impact Factor for Winter Severity Indices
    Thomas, Ryan ;
    Bennett, Richard
    2022-02-01 | PDF
    The State of Missouri is a diverse state in terms of winter weather patterns, population distribution and traffic patterns. Winter weather ranges from severe ice storms to high accumulation snow events to typical events with mixed precipitation types and amounts with a wide range of impacts across the state. Missouri has areas ranging from sparsely ...
  • Icy Road Forecast and Alert IcyRoad Validation and Refinement Using MDT RWIS Data
    Icy Road Forecast and Alert (IcyRoad): Validation and Refinement Using MDT RWIS Data
    Fowler, Jennifer W ;
    Jin, Menglin S
    2022-02-01 | PDF
    State Departments of Transportation (DOTs) need road ice condition forecasts to enhance public safety and awareness. This research was divided into two areas, Task 1 Development of IcyRoad Model and Task 2 Validation of the Ice Formula. Task 1 - A statewide IcyRoad model has been developed, tested, and refined during winter 2020-2021 using Montana ...
  • Safety Effectiveness of Cable Median Barriers in Louisiana Research Project Capsule 221SA
    Safety Effectiveness of Cable Median Barriers in Louisiana: Research Project Capsule [22–1SA]
    Mitran, Elisabeta ;
    Rupnow, Tyson
    2022-02-01 | PDF
    The goal of this project is to evaluate the effectiveness of cable median barriers installed on Louisiana highways. This project will also estimate the benefit-cost ratio of cable median barriers.
  • Optimizing Aggregate Gradation To Reduce Concretes Permeability Research Project Capsule 222C
    Optimizing Aggregate Gradation To Reduce Concrete’s Permeability: Research Project Capsule [22-2C]
    Milla, Jose ;
    Rupnow, Tyson
    2022-02-01 | PDF
    The objective of this study is two-fold. The first objective is to measure the influence of aggregate gradation on concrete’s permeability. The second is to optimize concrete mixture designs that meet strength, permeability, and workability criteria for construction.
  • Development of Automated Pavement Condition Score and Decision Logic
    Development of Automated Pavement Condition Score and Decision Logic
    Stefanski, Joe ;
    Premkumar, Laxmikanth
    2022-02-01 | PDF
    The Ohio Department of Transportation (ODOT) has been collecting 3D digital data on their pavement network since 2014. This data contains a variety of information derived from 3d laser scans of the pavement. While ODOT has been using the data to meet federal HPMS reporting requirements of pavement condition, the agency wished to leverage this wealt ...
  • Forecasting TravelTime Reliability
    Forecasting Travel-Time Reliability
    Swanson, Ben ;
    Culp, Justin
    2022-02-01 | PDF
    This analysis examined passively collected probe-vehicle travel-time data and traditional traffic counts to identify relationships between travel-time reliability and volume-to-capacity (V/C) ratios. Travel time and traffic volume data came from Utah Department of Transportation (UDOT) data portals, and roadway capacities came from the Wasatch Fron ...
  • Development of Guidelines for Collecting Transit Ridership Data
    Development of Guidelines for Collecting Transit Ridership Data
    Yang, Hong ;
    Xie, Kun
    2022-02-01 | PDF
    Transit ridership is a critical determinant for many transit applications such as operation optimizations and project prioritization under performance-based funding mechanisms. As a result, the quality of ridership data is of utmost importance to both transit administrative agencies and transit operators. Many transit operators in Virginia report t ...
  • Evaluation of a Transit Bus Collision Avoidance Warning System in Virginia
    Evaluation of a Transit Bus Collision Avoidance Warning System in Virginia
    Goodall, Noah ;
    Ohlms, Peter B.
    2022-02-01 | PDF
    Although professional bus operators receive extensive safety training, even a safe operator can become distracted at times or can lose sight of a vulnerable road user in one of the vehicle’s blind spots. In 2017, the Virginia Department of Rail and Public Transportation (DRPT) initiated a demonstration project to plan, implement, and evaluate a tra ...
  • Ohio HighwayRail Grade Crossing State Action Plan
    Ohio Highway-Rail Grade Crossing State Action Plan
    Ohio Rail Development Commission  ...
    2022-02-01 | PDF
    During 2021-2022, the Ohio Rail Development Commission (ORDC) and the Public Utilities Commission of Ohio (PUCO) developed the Ohio Highway-Rail Grade Crossing State Action Plan (SAP) for the State of Ohio. This document is an update to Ohio’s original plan that was published in 2011 and updated as of fiscal year (FY) 2016.The purpose of this plan ...
  • Minnesota Department of Transportation Innovation Strategy 2022
    Minnesota Department of Transportation: Innovation Strategy [2022]
    Minnesota. Department of Transportation. Office of Research & Innovation
    2022-02-01 | PDF
    The pace of change in our modern world is faster than at any time in human history. Evolutions in technology and society are forcing organizations from every sector to innovate and find new ways to respond and adapt. Innovation isn’t new to MnDOT— from being the first DOT to test autonomous vehicles in cold weather to providing real-time road condi ...
  • Assessment of Embedded Culvert Low Flow Hydraulics
    Assessment of Embedded Culvert Low Flow Hydraulics
    Sawosik, Ben ;
    Carter, Chloe
    2022-02-01 | PDF
    In 2010, New Hampshire adopted new rules for the permitting of stream crossings. One aspect of the new rules was that new culverts should be geomorphically sized and preferably have natural materials located at the stream crossing stream bed to better accommodate the passage of aquatic and other organisms. In culverts that are not open bottom, this ...
  • Evaluation of Concrete Pavement Buckling in Wisconsin
    Evaluation of Concrete Pavement Buckling in Wisconsin
    Rao, Shreenath ;
    Abdualla, Hesham
    2022-02-01 | PDF
    Buckling of concrete pavements is a serious problem in many states, but even more so in Wisconsin due to a combination of factors including climate, construction practices, maintenance practices, materials, and design. Although the incidences of buckling in concrete are fewer than other distresses such as cracking and spalling, they disproportionat ...
  • Evaluation of ALDOT Erosion Control Practices Using Rainfall Simulation
    Evaluation of ALDOT Erosion Control Practices Using Rainfall Simulation
    Donald, Wesley N. ;
    Fang, Xing
    2022-02-01 | PDF
    The rainfall simulator at the Auburn University Erosion and Sediment Control Test Facility (AU-ESCTF) was used to produce 2, 4, and 6 in. per hr rainfall intensities and has test plot dimensions of 8 ft. wide by 40 ft. long on a 3H:1V slope. Each rainfall experiment was an hour long with three sequential 20-minute rainfall intervals of increasing r ...
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