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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 3841 - 3860 of 36011 results
  • Comparison of ASTM Standards for the Evaluation of Geogrid Strength
    Comparison of ASTM Standards for the Evaluation of Geogrid Strength
    El-Hajjar, Rani F ;
    Titi, Hani H.
    2021-02-01 | PDF
    In this project we investigate the application of ASTM D4595, ASTM D6637 and ASTM D7737 on geogrids from more than 9 geogrid manufacturers supplying materials for Wisconsin DOT projects. The objective was to determine minimum standard guidelines that can be used in practice based on ASTM D6637 and what can be learned from the junction strength beha ...
  • Evaluating Reserve Strength of Girder Bridges Due to Bridge Rail Load Shedding
    Evaluating Reserve Strength of Girder Bridges Due to Bridge Rail Load Shedding
    Wang, Yao ;
    Tumbeva, Mirela D
    2021-02-01 | PDF
    This research experimentally and numerically evaluated the reserve strength of girder bridges due to bridge rail load shedding. The investigation included: (1) performing non-destructive field testing on two steel girder bridges and one prestressed concrete girder bridge, (2) developing validated finite element numerical models, and (3) performing ...
  • Do Equity and Accountability Get Lost in LOSTs? An Analysis of Local Return Funding Provisions in California’s Local Option Sales Tax Measures for Transportation [supporting datasets]
    Lederman, Jaimee ;
    Haas, Peter
    2021-02-01 | ZIP
    This study explores how local return provisions of local option sales taxes (LOSTs) for transportation are allocated and spent to meet local and regional transportation needs. Local return refers to the component of county LOST measures that provides funding directly to municipalities in the county to be used to meet local needs. Local return has b ...
    Dataset Supporting Files
  • Development of Concrete Material Property Database for Pavement ME Input
    Development of Concrete Material Property Database for Pavement ME Input
    Kim, S Sonny ;
    Durham, Stephan A.
    2021-02-01 | PDF
    The Georgia Department of Transportation (GDOT) has been moving toward using the Mechanistic–Empirical Pavement Design Guide (MEPDG), which deploys mechanistic and mathematical principles to analyze the material behaviors. For the smooth transition to this updated pavement design approach for rigid pavement design, GDOT has been developing a statew ...
  • Commercial Drivers License Prosecution Adjudication and Data Transmission
    Commercial Driver’s License Prosecution, Adjudication, and Data Transmission
    Martin, Andrew ;
    Koo, Jeeyen
    2021-02-01 | PDF
    The Kentucky Transportation Center research team examined law enforcement and adjudication of traffic offenses committed by commercial driver’s license holders. The objectives were to identify states that would provide the data, collect information about their court systems, analyze enforcement and/or adjudication data, and make some general observ ...
  • Intelligent Driving Intelligence Test for Autonomous Vehicles with Naturalistic and Adversarial Environment
    Intelligent Driving Intelligence Test for Autonomous Vehicles with Naturalistic and Adversarial Environment
    Feng, Shuo ;
    Yan, Xintao
    2021-02-01 | PDF
    Driving intelligence tests are critical to the development and deployment of autonomous vehicles. The prevailing approach tests autonomous vehicles in life-like simulations of the naturalistic driving environment. However, due to the high dimensionality of the environment and the rareness of safety-critical events, hundreds of millions of miles wou ...
  • InSitu Monitoring of InfiltrationInduced Instability of I70 Embankment West of the EisenhowerJohnson Memorial Tunnels Phase III
    In-Situ Monitoring of Infiltration-Induced Instability of I-70 Embankment West of the Eisenhower-Johnson Memorial Tunnels, Phase III
    Wayllace, Alexandra ;
    Lu, Ning
    2021-02-01 | PDF
    A new methodology that uses recent advances in unsaturated soil mechanics and hydrology was developed and tested. The approach consists of using soil suction and moisture content field information in the prediction of the likelihood of landslide movement. The testing ground was an active landslide on I-70 west of the Eisenhower/Johnson Memorial Tun ...
  • Adaptive Signal System Safety Impacts
    Adaptive Signal System Safety Impacts
    Chowdhury, Mashrur ;
    Huynh, Nathan
    2021-02-01 | PDF
    The research team conducted a literature review and a nation-wide survey at the beginning of the research. The literature review revealed that Adaptive Signal Control System (ASCS) was effective in reducing crashes in some studies, while in other studies, the crash reduction due to ASCS was not statistically significant. Twenty-eight states partici ...
  • Division of Engineering Research on Call ROC Agreement 31796 Task 7 Service Evaluation of Highway Structures With SoilBearing Spread Footings
    Division of Engineering Research on Call (ROC) Agreement 31796 Task 7 – Service Evaluation of Highway Structures With Soil-Bearing Spread Footings
    Nusairat, Jamal ;
    Tarawneh, Bashar
    2021-02-01 | PDF
    The Ohio Department of Transportation (ODOT) needs to evaluate highway structures’ performance supported on spread footings bearing on soils. This evaluation’s outcomes are recommendations for future use of spread footings and potential limitations on their use. The project team completed the following tasks: 1. Reviewed the documented performance ...
  • I80 Hybrid Regulatory Speed Limit Signing Design and VSL System Evaluation
    I-80 Hybrid Regulatory Speed Limit Signing Design and VSL System Evaluation
    Azin, Bahar ;
    Yang, Xianfeng (Terry)
    2021-02-01 | PDF
    To improve traffic safety on a section of I-80 (through the mountains east of Salt Lake City) that experiences frequent periods of difficult weather, the Utah Department of Transportation (UDOT) implemented a Variable Speed Limit (VSL) zone (from MP 128.0 to MP 141.0 in both directions) using regulatory hybrid Changeable Message Signs (CMS). Origin ...
  • Continuous Snow Temperature Monitoring for the Idaho Highway 21 Avalanche Program
    Continuous Snow Temperature Monitoring for the Idaho Highway 21 Avalanche Program
    Youngblood, Peter ;
    Marshall, Hans-Peter
    2021-02-01 | PDF
    Predicting metamorphism within seasonal snowpacks is critical for avalanche forecasting and runoff timing as it relates to water supply management. Snowpack temperature gradients play a key role in snow metamorphism, and their magnitude controls how snow strength changes; therefore, they are of interest to avalanche forecasters. Before major melt, ...
  • Tsunami Loads on Straight and Skewed Bridges Part 1 Experimental Investigation and Design Recommendations
    Tsunami Loads on Straight and Skewed Bridges – Part 1: Experimental Investigation and Design Recommendations
    Istrati, Denis ;
    Buckle, Ian G.
    2021-02-01 | PDF
    This report presents the results of a large-scale experimental investigation of tsunami impact on straight and skewed bridges. The 1:5 scale specimens had realistic structural components and dynamic properties, and were subjected to a range of simplified unbroken solitary waves and more realistic bores. The unique experimental data revealed: (a) th ...
  • Develop an Improved SDDOT Construction Cost Index
    Develop an Improved SDDOT Construction Cost Index
    Jeong, David H. ;
    Shrestha, K. Joseph
    2021-02-01 | PDF
    A highway construction cost index (HCCI) is an indicator of the purchasing power of a highway agency. Highway agencies can monitor their construction market conditions using HCCIs to make various financial planning decisions. The main goal of this study is to modernize the HCCI system of South Dakota DOT by developing an enhanced HCCI calculation a ...
  • Drivers Mental Models of Advanced Vehicle Technologies A Proposed Framework for Identifying and Predicting Operator Errors
    Driver’s Mental Models of Advanced Vehicle Technologies: A Proposed Framework for Identifying and Predicting Operator Errors
    Pradhan, Anuj K. ;
    Pai, Ganesh
    2021-02-01 | PDF
    Advanced vehicle technologies are increasingly more accessible and available in vehicles. These current and future systems, despite promising added safety, convenience, and efficiency to drivers and road users, have an inherently higher level of complexity than the driving systems that most drivers are used to operating. In order to maximize the pr ...
  • Safety Impact Evaluation of a NarrowAutomated VehicleExclusive Reversible Lane on an Existing Smart Freeway
    Safety Impact Evaluation of a Narrow-Automated Vehicle-Exclusive Reversible Lane on an Existing Smart Freeway
    Machiani, Sahar Ghanipoor ;
    Jahangiri, Arash
    2021-02-01 | PDF
    This study fills the gap in the limited research on the effect of emerging Automated Vehicle (AV) technology on infrastructure standards. The main objective of this research is to evaluate implications of an innovative infrastructure solution, exclusive AV lanes, for safe and efficient integration of AVs into an existing transportation system. Exam ...
  • Structural Identification and Damage Detection in Bridges Using Wave Method and Uniform Shear Beam Models A Feasibility Study
    Structural Identification and Damage Detection in Bridges Using Wave Method and Uniform Shear Beam Models: A Feasibility Study
    Rahmani, Mehran ;
    Naik, Manan
    2021-02-01 | PDF
    This report presents a wave method to be used for the structural identification and damage detection of structural components in bridges, e.g., bridge piers. This method has proven to be promising when applied to real structures and large amplitude responses in buildings (e.g., mid-rise and high-rise buildings). This study is the first application ...
  • Development Implementation and Tracking of Preventative Safety Metrics
    Development, Implementation, and Tracking of Preventative Safety Metrics
    Al-shabbani, Zamaan ;
    Ammar, Ashtarout
    2021-02-01 | PDF
    What gets measured, gets improved. With respect to the safety and health of Kentucky Transportation Cabinet (KYTC) employees, the primary metric used has been the OSHA recordable incident rate. This incident rate measures how often a Cabinet employee sustains an injury that demands more than basic first aid. This metric is important for understandi ...
  • Repair and Strengthening of Bridges in Indiana Using Fiber Reinforced Polymer Systems Volume 2 FRP Flexural Strengthening and End Region Repair Experimental Programs
    Repair and Strengthening of Bridges in Indiana Using Fiber Reinforced Polymer Systems: Volume 2 – FRP Flexural Strengthening and End Region Repair Experimental Programs
    Rich, William B. ;
    Jacobs, Robert R
    2021-02-01 | PDF
    For bridges that are experiencing deterioration, action is needed to ensure the structural performance is adequate for the demands imposed. Innovate repair and strengthening techniques can provide a cost-effective means to extend the service lives of bridges efficiently and safely. The use of fiber reinforced polymer (FRP) systems for the repair an ...
  • Deterioration of Green Conflict Paint for Bicycle Facilities
    Deterioration of Green Conflict Paint for Bicycle Facilities
    Kassem, Emad ;
    Lowry, Michael
    2021-02-01 | PDF
    Bicyclists depend on the visibility of the surrounding environment to maintain a safe travel path. Throughout the country, new types of bicycle infrastructure and pavement markings are being installed. This study used a new procedure to evaluate different pavement markings used in bike lanes. Three different paints were evaluated, including green w ...
  • Evaluating Pedestrian Crossings on HighSpeed Urban Arterials
    Evaluating Pedestrian Crossings on High-Speed Urban Arterials
    Codjoe, Julius ;
    Mitran, Elisabeta
    2021-02-01 | PDF
    The aim of this study is to provide a preliminary assessment of Louisiana’s high-speed urban arterials in terms of existing pedestrian crossing facilities and identify any associations of pedestrian crashes with the presence or lack of such pedestrian crossing facilities. In achieving this aim, several tasks were undertaken including: documenting p ...
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