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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 4841 - 4860 of 36020 results
  • CorrosionResistant Stainless Steel Strands for Prestressed Bridge Piles in Marine Atmospheric Environments
    Corrosion-Resistant Stainless Steel Strands for Prestressed Bridge Piles in Marine Atmospheric Environments
    Troconis, B C Rincon ;
    Sharp, Stephen R
    2020-03-01 | PDF
    This study demonstrated that Type 2205 stainless steel strand can be used as a replacement for conventional ASTM A416 steel strands where an increase in service life is required. The benefit and practicality of using Type 2205 stainless steel strand in prestressed piles were determined from two tasks performed in this study. First, a corrosion asse ...
  • Seismic Behavior of Grade 80 RC Bridge Columns Phase 1 and Critical Bending Strain of Longitudinal Reinforcement
    Seismic Behavior of Grade 80 RC Bridge Columns – Phase 1 and Critical Bending Strain of Longitudinal Reinforcement
    Barcley, Leo ;
    Kowalsky, Mervyn J.
    2020-03-01 | PDF
    Modern seismic design relies on the principles of capacity design wherein certain structural members are chosen as plastic hinge members. In reinforced concrete, the choice of reinforcement is crucial for desirable performance of plastic hinge members. Current design codes specify a maximum yield strength of 60 ksi (Grade 60) for reinforcement used ...
  • Evaluation of Intelligent School Zone Beacon and VehicleCyclist Detection and Warning System
    Evaluation of Intelligent School Zone Beacon and Vehicle-Cyclist Detection and Warning System
    Jain, Eakta ;
    Srinivasan, Sivaramakrishnan
    2020-03-01 | PDF
    The main purpose of this study is to evaluate a smartphone-based app called “TravelSafely” developed by Temple/AI. This app has the capability to alert drivers if they exceed a given speed threshold in an active school zone or when they are approaching a cyclist and a collision is possible. We collected trajectory and eye tracking data from 50 part ...
  • Managing NetworkLevel Scour Risks for Iowa Bridges
    Managing Network-Level Scour Risks for Iowa Bridges
    Shahrebabaki, Mehrdad Morshedi ;
    Bektas, Basak
    2020-03-01 | PDF
    In recent years, risk-based management of infrastructure assets has gained predominance in infrastructure asset management. The Moving Ahead for Progress in the 21st Century Act (MAP–21), in alignment with this, has required state transportation agencies to incorporate risk-based management into their planning for systematic preventative maintenanc ...
  • TravelTime Reliability Data and Analysis Tools Utah Pilot Tests SHRP2 L38 IAP Round 7 including L02 L05 L08
    Travel-Time Reliability Data and Analysis Tools: Utah Pilot Tests (SHRP2 L38 IAP Round 7, including L02, L05, L08)
    Chen, Zhuo ;
    Liu, Xiaoyue Cathy
    2020-03-01 | PDF
    Travel-time reliability (TTR), which significantly influences people’s travel experience and costs, is an important indicator in evaluating the performance of the transportation system, especially the freeway network. To evaluate TTR of transportation systems and incorporate TTR into the planning and programming process, the SHRP2 program previousl ...
  • Optimizing Fuel Consumption and Pollutant Emissions in Truck Routing with Parking Availability Prediction and Working Hours Constraints
    Optimizing Fuel Consumption and Pollutant Emissions in Truck Routing with Parking Availability Prediction and Working Hours Constraints
    Vital, Filipe de Almeida Araujo ;
    Ioannou, Petros
    2020-03-01 | PDF
    The transportation sector is responsible for a significant part of the U.S.’s greenhouse emissions, with a considerable amount being generated by medium- and heavy-duty trucks. However, when it comes to the trucking industry, ‘green’ routing studies do not consider other critical practical factors, like working hours regulations and parking availab ...
  • Rural Speed Safety Project for USDOT Safety Data Initiative Summary Report
    Rural Speed Safety Project for USDOT Safety Data Initiative: Summary Report
    Das, Subasish ;
    Geedipally, Srinivas
    2020-03-01 | PDF
    The objective of this project was to examine prevailing operating speeds on a large scale to determine how speed and speed differentials interact with roadway characteristics to influence the likelihood of crashes. The project team conducted three major tasks: (a) developed conflated databases for Ohio and Washington by incorporating the Highway Sa ...
    Supporting Files
  • Evaluate the Use of PWL As Payment Adjustment Factor for Asphalt Mixtures
    Evaluate the Use of PWL As Payment Adjustment Factor for Asphalt Mixtures
    Rahman, Syeda ;
    Bhasin, Amit
    2020-03-01 | PDF
    The payment awarded to a Contractor for production and placement of asphalt mixes under Specification Items 341, 344, and 346 involves a payment adjustment factor that either awards a bonus or assigns a penalty to the base payment depending on the test results for laboratory-molded density (production) and in-place air voids (placement or construct ...
  • Evaluation of Partial Depth Pavement Repairs on Routes Heavily Traveled by Amish Horse and BuggiesPhase 2
    Evaluation of Partial Depth Pavement Repairs on Routes Heavily Traveled by Amish Horse and Buggies-Phase 2
    Nazzal, Munir D. ;
    Kim, Sang Soo
    2020-03-01 | PDF
    This report summarizes the results of a research project that was conducted to identify and evaluate the cost-effectiveness of alternative repair mixtures and methods and their combination that can be used to improve the performance and service life of partial depth repairs performed on Amish buggy routes in Ohio, and identify all possible changes ...
  • Forensic Evaluation of GeogridReinforced Flexible Pavement Sections on SR10 Near Emery Utah
    Forensic Evaluation of Geogrid-Reinforced Flexible Pavement Sections on SR-10 Near Emery, Utah
    Burns, Henrik ;
    Lawton, Evert C.
    2020-03-01 | PDF
    The purpose of this UDOT research project was to investigate and determine the reasons for premature deterioration of the geogrid-reinforced pavement system on the section of SR-10 between Muddy Creek and Emery, Utah. The statistical analyses and evaluations indicate that the structural design of the primary pavement system was adequate as the stif ...
  • Adaptive Signal Control Algorithms for Connected Vehicles [supporting dataset]
    Comert, Gurcan ;
    Chowdhury, Mashrur
    2020-03-01 | PDF
    Traffic congestion at a signalized intersection greatly reduces the travel time reliability in urban areas. Adaptive signal control system (ASCS) is an advanced traffic signal control technology that regulates the signal phasing and timings considering the traffic patterns in real-time in order to reduce traffic congestion. Real-time prediction of ...
    Dataset Supporting Files
  • Safety and Operational Analysis with Mitigation Strategies for Freeway Truck Traffic in Wyoming
    Safety and Operational Analysis with Mitigation Strategies for Freeway Truck Traffic in Wyoming
    Zlatkovic, Milan ;
    Ksaibati, Khaled
    2020-03-01 | PDF
    Interstate 80, in Wyoming, is characterized by heavy truck traffic, with an average of 47 percent of heavy trucks in the traffic flow. Trucks have significantly different physical and driving characteristics than passenger cars, especially on grades, which has impacts on operational efficiency and safety. The presence of heavy vehicles reduces the ...
  • Mash TL3 Full Scale Crash Testing and Evaluation of Transition From 32Inch Tall Weak Post Guardrail System to MGS Strong Post System
    Mash TL-3 Full Scale Crash Testing and Evaluation of Transition From 32-Inch Tall Weak Post Guardrail System to MGS Strong Post System
    Dobrovolny, Chiara Silvestri ;
    Schulz, Nathan D.
    2020-03-01 | PDF
    With the adoption of the American Association of State Highway and Transportation Officials (AASHTO)/Federal Highway Administration (FHWA) Joint Implementation Agreement for Manual for Assessing Safety Hardware (MASH) in 2015, originally all transition systems for projects on the National Highway System advertised for construction after December 31 ...
  • Texas Seal Coat Design Method
    Texas Seal Coat Design Method
    Goehl, Darlene C ;
    Estakhri, Cindy
    2020-03-01 | PDF
    Seal coat is a layer of asphalt binder with a layer of aggregate applied over a pavement. The purpose of a seal coat is to seal the pavement from air and water intrusion while providing the safety benefits of maintaining sufficient friction over the seal coat’s design life. With an investment of over $300,000,000 annually, it is imperative to const ...
  • State Highway 9 Wildlife Crossings Monitoring Year 4 Progress Report
    State Highway 9 Wildlife Crossings Monitoring – Year 4 Progress Report
    Kintsch, Julia ;
    Cramer, Patricia
    2020-03-01 | PDF
    The State Highway 9 (SH 9) Colorado River South Wildlife & Safety Improvement Project installed seven large wildlife crossing structures and 10.4 miles of wildlife exclusion fence between Kremmling and Green Mountain Reservoir in Grand County, Colorado. The project was designed to improve driver safety while providing permeability for wildlife acro ...
  • Active Traffic Monitoring Through Large Scale Processing of Aerial Camera Array Networks [supporting dataset]
    Sarasua, Wayne A. ;
    Zhao, Xi
    2020-03-01 | PDF
    This research focuses on automated processing of video from a persistent surveillance camera array to extract traffic data from a 25 square mile area. In previous research, we developed an automated traffic surveillance system capable of processing aerial camera array imagery to extract valid and useful traffic data for diverse applications. In thi ...
    Dataset Supporting Files
  • Application of the Equity Rubric for Purpose and Need to a Demonstration Corridor in the Texas Megaregion
    Application of the Equity Rubric for Purpose and Need to a Demonstration Corridor in the Texas Megaregion
    Lewis, Carol Abel ;
    Goodwin, Gwendolyn
    2020-03-01 | PDF
    State transportation agencies and Metropolitan Planning Organizations (MPOs) seek to improve access to employment, health care and other essential needs and services for vulnerable or at-risk populations. Purpose and need statements trigger the planning process for projects leading to increased mobility. The designation of purpose and need for rura ...
  • Delivery Methods for Accelerated Bridge Construction Projects Case Studies and Consensus Building
    Delivery Methods for Accelerated Bridge Construction Projects: Case Studies and Consensus Building
    Freeseman, Katelyn ;
    Shane, Jennifer S.
    2020-03-01 | PDF
    Accelerated bridge construction (ABC) is a solution for upgrading substandard bridges that reduces construction and closure times and minimizes exposure of the traveling public and road workers to construction activities. To take full advantage of the benefits of ABC, agencies should decide which projects are appropriate for ABC and which procureme ...
    Supporting Files
  • Toward a More Efficient Network Structure for Travel Demand Modeling Summary
    Toward a More Efficient Network Structure for Travel Demand Modeling [Summary]
    Bejleri, Ilir
    ORCID ICON IMG
    2020-03-01 | PDF
    University of Florida researchers identified a more efficient multi-scale roadway network that will enable effective information sharing between the statewide travel demand models and district or local models, while preserving the detailed information provided by the finer network segmentation
  • Improvement of Stiffness and Strength of Backfill Soils Through Optimization of Compaction Procedures and Specifications
    Improvement of Stiffness and Strength of Backfill Soils Through Optimization of Compaction Procedures and Specifications
    Rahman, Shahedur ;
    Salgado, Rodrigo
    2020-03-01 | PDF
    Vibration compaction is the most effective way of compacting coarse-grained materials. The effects of vibration frequency and amplitude on the compaction density of different backfill materials commonly used by INDOT (No. 4 natural sand, No. 24 stone sand, and No. 5, No. 8, No. 43 aggregates) were studied in this research. The test materials were c ...
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