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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 4341 - 4360 of 36019 results
  • Measuring Success for Safe Routes to School Programs Research Brief
    Measuring Success for Safe Routes to School Programs [Research Brief]
    Pande, Anurag ;
    Voulgaris, Carole Turley
    2020-09-01 | PDF
    Safe Routes to School (SRTS) programs aim to increase the share of students who commute to school by active modes (e.g., walking and cycling). The goal of this work was to assess the effectiveness of SRTS programs. Towards that end, we analyzed the California Household Travel Survey (CHTS) data from the four counties in the San Francisco Bay area. ...
  • Automatic Traffic Monitoring and Management for Pedestrian and Cyclist Safety Using Deep Learning and Artificial Intelligence
    Automatic Traffic Monitoring and Management for Pedestrian and Cyclist Safety Using Deep Learning and Artificial Intelligence
    Pourhomayoun, Mohammad
    ORCID ICON IMG
    2020-09-01 | PDF
    In this project, we have designed and developed an effective end-to-end system based on advanced Artificial Intelligence (AI), machine learning, and computer vision to automatically monitor, detect, track, and count pedestrians and bicyclists. The main objective of this project is to improve the safety of pedestrians and bicyclists, by applying sel ...
  • Development and Validation of Methodologies for Rapid Inspection and Assessment of Fatigue Damage
    Development and Validation of Methodologies for Rapid Inspection and Assessment of Fatigue Damage
    Roy, Sougata
    2020-09-01 | PDF
    Causes of unusual fatigue cracking of a steel bridge owned by the New Jersey Turnpike Authority (NJTA) was investigated by Finite Element Analysis (FEA). The bridge is located on a strategic commerce route and is subjected to high Average Daily Truck Traffic (ADTT) consisting of significant fraction of overloaded trucks having Gross Vehicle Weight ...
  • Longer Service Life Bridge Coatings
    Longer Service Life Bridge Coatings
    Wells, Danny ;
    Hopwood, Theodore
    2020-09-01 | PDF
    The Kentucky Transportation Cabinet (KYTC) has maintenance oversight responsibilities for approximately 1,100 steel bridges; it also helps local governments and other entities with maintenance painting on other steel bridges. Because maintaining steel bridges is costly, Cabinet officials asked Kentucky Transportation Center (KTC) researchers to ide ...
  • DSRBased Test Procedures and Specification Guidelines for Grading PG 58XX and PG 64SXX Asphalt Binders in Kansas
    DSR-Based Test Procedures and Specification Guidelines for Grading PG 58-XX and PG 64S-XX Asphalt Binders in Kansas
    Darabi, Masoud K
    2020-09-01 | PDF
    This report addresses a shortcoming of the Multiple Stress Creep Recovery (MSCR) test method and specification system for virgin PG 58-XX and blends of PG 58-XX with reclaimed asphalt pavement (RAP) binders. The MSCR specification system limits the non-recoverable compliance, Jnr, to less than 4.5 kPa-1 for standard S-graded binders and disregards ...
  • Structural Assessment for MD Sign Structures Project based on AASHTO LTS6 Strength and Fatigue Criteria
    Structural Assessment for MD Sign Structures Project based on AASHTO LTS-6 Strength and Fatigue Criteria
    Fu, Chung C. ;
    Ye, Yunchao
    2020-09-01 | PDF
    The purpose of this project is to conduct a structural assessment of Maryland sign structures based on the American Association of State Highway and Transportation Officials (AASHTO) Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals, 6th edition (AASHTO LTS-6) strength and fatigue criteria, using these criter ...
  • Prediction of Road Condition and Smoothness for Flexible and Rigid Pavements in Louisiana Using Neural Networks Research Project Capsule 211P
    Prediction of Road Condition and Smoothness for Flexible and Rigid Pavements in Louisiana Using Neural Networks: Research Project Capsule [21–1P]
    Wu, Zhong
    2020-09-01 | PDF
    To achieve the objectives of this study, a neural network based system will be developed, using the data collected by DOTD on regular basis and local weather information. The proposed methodology can be summarized as follows. A review and documentation of the current state of practice by DOTD will evaluate short-term and long-term road condition an ...
  • Truck Traffic and Load Spectra of Indiana Roadways for the MechanisticEmpirical Pavement Design Guide
    Truck Traffic and Load Spectra of Indiana Roadways for the Mechanistic-Empirical Pavement Design Guide
    Bao, Jieyi ;
    Hu, Xiaoqiang
    2020-09-01 | PDF
    The Mechanistic-Empirical Pavement Design Guide (MEPDG) has been employed for pavement design by the Indiana Department of Transportation (INDOT) since 2009 and has generated efficient pavement designs with a lower cost. It has been demonstrated that the success of MEPDG implementation depends largely on a high level of accuracy associated with the ...
  • Traffic Noise Barrier Analysis for SH 190 in Rowlett Texas
    Traffic Noise Barrier Analysis for SH 190 in Rowlett, Texas
    Trevino, Manuel
    2020-09-01 | PDF
    The Texas Department of Transportation commissioned a study to analyze the feasibility and effectiveness of lightweight noise barriers on Interstate Highway (IH) 30, near downtown Dallas in 2013. The study led to the installation of two adjacent transparent highway noise barriers in 2013 and 2018, respectively. The success of that project led to th ...
  • Assessing Corrosion of Extracted MSE Wall Reinforcement Coupons Utah Phase II Study
    Assessing Corrosion of Extracted MSE Wall Reinforcement Coupons, Utah Phase II Study
    Fonseca, Fernando S. ;
    Thompson, Robert A
    2020-09-01 | PDF
    The purpose of this study was to extract galvanized steel wire reinforcement coupons from mechanically stabilized earth (MSE) walls along I-15 in Salt Lake Valley and determine the rate of corrosion that has taken place since Phase I, which was conducted by Gerber and Billings (2010). The galvanized steel reinforcement analyzed in this study has be ...
  • Model Development Standards in the Construction Industry and Beyond
    Model Development Standards in the Construction Industry and Beyond
    Maier, Francesca
    2020-09-01 | PDF
    UDOT has made investments in formalizing its approach to digital delivery during the design phase. UDOT has published and updated a guideline for model development and defined standards for model development. The guidelines and standard apply to the design phase and prepare digital data for use in construction and handing over asset information pos ...
  • Quantifying Mountain Basin Runoff Mechanisms for Better Hydrologic Design
    Quantifying Mountain Basin Runoff Mechanisms for Better Hydrologic Design
    Woolridge, D. D ;
    Niemann, J. D
    2020-09-01 | PDF
    Hydrologic analyses are used for dam safety evaluations to determine the flow a dam must pass without failing. They are also used to evaluate bridge and culvert designs from a hydrologic perspective. Many current guidelines model flood runoff solely by an infiltration-excess mechanism. Saturation-excess runoff and subsurface stormflow mechanisms ar ...
  • Connected Autonomous Vehicles Safety During Merging and Lane Change and Impact on Traffic Flow
    Connected Autonomous Vehicles: Safety During Merging and Lane Change and Impact on Traffic Flow
    Iannou, Petros ;
    Monteiro, Fernando V
    2020-09-01 | PDF
    In this report we address the problem of cooperative lane change maneuvers where vehicles communicate with each other and negotiate the creation of safe spacings in order to merge without taking any safety risks. The proposed approach requires that the merging vehicle negotiates the creation of a safety gap in the destination lane and till the lane ...
  • Characterization of Runoff Quality From Paved LowVolume Roads and Optimization of Treatment Methods
    Characterization of Runoff Quality From Paved Low-Volume Roads and Optimization of Treatment Methods
    Natarajan, Poornima ;
    Weiss, Peter T.
    2020-09-01 | PDF
    Vehicular traffic contributes a large fraction of the pollutant load in stormwater runoff from roadways. While runoff concentrations have historically been characterized for urban roads with high average daily traffic (ADT), the runoff quality from paved rural roads that have relatively low ADT is largely unknown. In this study, runoff from low-vol ...
  • Planning Corridors for Transit Signal Priority While Considering Pedestrian Delay
    Planning Corridors for Transit Signal Priority While Considering Pedestrian Delay
    Heaslip, Kevin P ;
    Kim, Doyeon
    2020-09-01 | PDF
    This research study consisted of developing a decision-support tool for Transit Signal Priority (TSP) implementation for Virginia corridors. TSP is a measure to temporarily modify signal timings to prioritize transit vehicle movement and improve performance at signalized intersections. The study included an in-depth literature review, criteria iden ...
  • Assessing Corrosion of Extracted MSE Wall Reinforcement Coupons Utah Phase II Study
    Assessing Corrosion of Extracted MSE Wall Reinforcement Coupons, Utah Phase II Study
    Fonseca, Fernando S. ;
    Thompson, Robert A
    2020-09-01 | PDF
    The purpose of this study was to extract galvanized steel wire reinforcement coupons from mechanically stabilized earth (MSE) walls along I-15 in Salt Lake Valley and determine the rate of corrosion that has taken place since Phase I, which was conducted by Gerber and Billings (2010). The galvanized steel reinforcement analyzed in this study has be ...
  • Geostatistical Deep Foundation Design Software
    Geo-statistical Deep Foundation Design Software
    Davidson, Michael T. ;
    McVay, Michael C.
    2020-09-01 | PDF
    Significant portions of overall design and construction costs for Florida bridges are typically attributed to deep foundation components. Such costs arise because soils are highly variable materials; measured soil properties typically exhibit spatial variability across a given site, both with respect to depth and horizontal position. In addition, e ...
  • New Carbon Fiber Anchor To Secure Carbon FiberReinforced Polymer CFRP Flexural Strengthening Sheets
    New Carbon Fiber Anchor To Secure Carbon Fiber-Reinforced Polymer (CFRP) Flexural Strengthening Sheets
    Rasheed, Hayder A. ;
    Foerster, Andrew S
    2020-09-01 | PDF
    Externally bonded fiber-reinforced polymer (FRP) is commonly used to strengthen concrete structures, but research is needed to ensure that optimal design practices are implemented. This study utilized externally bonded carbon FRP (CFRP) to strengthen bridge-scale reinforced concrete T-beams. In addition to flexural CFRP, new CFRP splay anchors were ...
  • Construction of LowCracking HighPerformance Bridge Decks Incorporating New Technology
    Construction of Low-Cracking High-Performance Bridge Decks Incorporating New Technology
    Lafikes, James ;
    Darwin, David
    2020-09-01 | PDF
    Construction and early-age crack evaluations of four bridge decks in Minnesota placed from 2016 to 2018 that incorporate specifications for Internally-Cured Low-Cracking High-Performance Concrete (IC-LC-HPC) are documented in this study. Two additional decks followed specifications for high-performance concrete and served as controls paired with IC ...
  • Effectiveness of Green Strobes on Winter Maintenance Vehicles and Equipment
    Effectiveness of Green Strobes on Winter Maintenance Vehicles and Equipment
    Zockaie, Ali ;
    Saedi, Ramin
    2020-08-31 | PDF
    Snow removal and deicing activities are performed by roadway agencies to enhance winter mobility and safety. Due to slower travel speeds during these operations, low visibility and reduced pavement friction, safety and collision avoidance remain persistent concerns. To improve the visibility of winter maintenance vehicles, the Michigan Department o ...
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