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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 1341 - 1360 of 35448 results
  • LargerDiameter Shear Studs for Composite Steel Bridges
    Larger-Diameter Shear Studs for Composite Steel Bridges
    Deng, Xianjue ;
    Wan, Lu
    2023-10-31 | PDF
    Composite steel bridge girders are typically constructed using 7/8″ diameter shear studs. A large number of shear studs is often needed to satisfy AASHTO shear stud fatigue and strength requirements. Using a larger diameter shear stud can significantly reduce the required number of shear studs which in turn can improve construction worker safety, e ...
  • Use of LargerDiameter Shear Studs for Composite Steel Bridges Project Summary
    Use of Larger-Diameter Shear Studs for Composite Steel Bridges [Project Summary]
    Deng, Xianjue ;
    Wan, Lu
    2023-10-31 | PDF
    The research included preliminary design studies to quantify the reduction in the number of shear studs that can be achieved with larger-diameter shear studs. This was followed by an extensive investigation of stud welding, followed by push-out tests to evaluate the static and fatigue performance of larger-diameter shear studs. Parametric finite el ...
  • Vessel Electrification Investigation for the NCDOT Ferry Division Fleet
    Vessel Electrification Investigation for the NCDOT Ferry Division Fleet
    Hildreth, John ;
    Karayaka, Bora
    2023-10-31 | PDF
    Ferry electrification is a growing domestic and global trend, driven by an interest in reducing operational and maintenance costs, and mitigating emissions at ports. Ferries are particularly well suited for electrification due to their relatively short travel distances over fixed routes, predictable schedule, and their ample onboard space for batte ...
  • Develop Standards for Temporary Concrete Median Barrier in FloodProne Areas Project Summary
    Develop Standards for Temporary Concrete Median Barrier in Flood-Prone Areas [Project Summary]
    Bligh, Roger ;
    Silvestri-Dobrovolny, Chiara
    2023-10-31 | PDF
    The objective of this project was to develop a hydraulically efficient portable concrete barrier (PCB) that complies with the American Association of State Highway and Transportation Officials Manual for Assessing Safety Hardware (MASH).
  • Exploring the Use of Artificial Intelligence to Leverage TxDOT Data for Enhanced Corridor Management and Operations Project Summary
    Exploring the Use of Artificial Intelligence to Leverage TxDOT Data for Enhanced Corridor Management and Operations [Project Summary]
    Juri, Natalia Ruiz ;
    Perrine, Ken
    2023-10-31 | PDF
    This project explored the use and value of AI and ML in transportation taking a multi-pronged approach that includes a literature review, a workshop, a survey, the development of three prototype ML models for four high-priority use cases, and the field testing of one of the prototyped models. Initial tasks were exploratory in nature and led to a be ...
  • Roadside Safety Device Analysis Testing and Evaluation Program Project Summary Report
    Roadside Safety Device Analysis, Testing, and Evaluation Program [Project Summary Report]
    Bligh, Roger ;
    Cakalli, Sofokli
    2023-10-31 | PDF
    This project evaluated prioritized roadside safety issues and resulted in new or improved roadside safety devices. Devices found to be MASH compliant are suitable for implementation. Implementation of these roadside safety devices will improve motorist safety, reduce material and installation costs, and/or improve operations. These devices are bein ...
  • 07095 Evaluating Streamflow Measurement at TxDOT Bridges Summary
    0-7095: Evaluating Streamflow Measurement at TxDOT Bridges [Summary]
    Maidment, David ;
    Passalacqua, Paola
    2023-10-31 | PDF
    The Texas Department of Transportation (TxDOT) wishes to move from a reactive to a proactive response during flood emergency operations. Real-time flood map services provide valuable information for TxDOT flood decision making. The National Weather Service initiated the operation of real-time flood inundation maps for Texas in October 2023. The res ...
  • InService Performance Evaluation ISPE of New England Transportation Consortium NETC Steel Bridge Railings
    In-Service Performance Evaluation (ISPE) of New England Transportation Consortium (NETC) Steel Bridge Railings
    Carrigan, Christine E ;
    Plaxico, Chuck A.
    2023-10-27 | PDF
    The predominate bridge railing used in the New England States are two-, three-, and four-bar steel post-and-beam designs developed and crash tested under the auspices of the New England Transportation Consortium (NETC). These bridge railing designs are commonly referred to as NETC bridge railings. The crash tests were performed in compliance with t ...
  • Advanced Testing and Characterization of Iowa Soils and Geomaterials Tech Transfer Summary
    Advanced Testing and Characterization of Iowa Soils and Geomaterials [Tech Transfer Summary]
    Cetin, Bora ;
    Ceylan, Halil
    2023-10-22 | PDF
    Objectives • Evaluating the cross-anisotropic stiffness characteristics of Iowa soils and geomaterials through advanced cyclic true triaxial tests. • Evaluating the cross-anisotropic permanent deformation characteristics of Iowa soils and geomaterials through advanced cyclic true triaxial tests. • Determining the effect of freeze-thaw action on sti ...
  • Comprehensive Study on CMV Safety Using ITS in Work Zones on Freeways and Arterials
    Comprehensive Study on CMV Safety Using ITS in Work Zones on Freeways and Arterials
    Jeihani, Mansoureh ;
    Khadem, Nashid
    2023-10-20 | PDF
    Work zones pose significant safety challenges on highways, with Commercial Motor Vehicles (CMVs) being particularly susceptible to higher risk due to their larger size, slower acceleration/deceleration rates, and expanded blind spots. This study aimed to assess the impact of various work zone warning measures on the driving behavior of CMV operator ...
  • Hamilton Neighborhood Traffic Circle Traffic Calming Project June 1st October 15th 2023
    Hamilton Neighborhood Traffic Circle Traffic Calming Project: June 1st – October 15th, 2023
    Madsen, Matthew ;
    Gleason, Rebecca
    2023-10-15 | PDF
    The Western Transportation Institute (WTI) has been communicating with Bike Walk Montana and the Montana Department of Commerce’s Main Street Program to assist small towns with pop-up projects aimed at slowing traffic to create safer streets. The Department of Commerce reached out regarding opportunities for pop-up traffic calming in Hamilton, Mont ...
  • The Effect of Coefficient of Friction Between Rail Vehicle Wheels and Rail Track on Operation Power Consumption
    The Effect of Coefficient of Friction Between Rail Vehicle Wheels and Rail Track on Operation Power Consumption
    Mahamudin, Nur Shahibrahim ;
    Darsivan, Fadly Jashi
    2023-10-12 | PDF
    The daily cost of rail operation is increasing due to the increase of rail network size. Therefore, reduction in operation power consumption is important to rail operator in order to fully optimize the daily operation cost. Operation power consumption in rail operation can be divided into 80% traction power such as vehicle propulsion system and 20% ...
  • Data Management Mining and Inference for Bridge Monitoring
    Data Management, Mining, and Inference for Bridge Monitoring
    Rizzo, Piervincenzo ;
    Enshaeian, Alireza
    2023-10-04 | PDF
    According to the Federal Highway Administration (FHWA), there are over 600,000 highway bridges in the United States. Nationwide, the performance evaluation of bridges starts with the inspection of the bridge to determine the current condition. Inspections are conducted in accordance with the National Bridge Inspection Standards (NBIS). With more th ...
  • Effect of Longitudinal Joint Construction and Density on Asphalt Pavement Performance Phase I State of the Practice
    Effect of Longitudinal Joint Construction and Density on Asphalt Pavement Performance – Phase I – State of the Practice
    Akentuna, Moses ;
    Salari, Saman
    2023-10-01 | PDF
    The construction of longitudinal joints to specified densities significantly impacts the performance and service life of asphalt pavements. Ensuring proper compaction is essential to creating impermeable joints that can withstand water infiltration, prevent moisture damage, and enhance long-term performance. Various entities, including state depart ...
  • Utilization of UHPC Bridge Superstructures in Texas Volume 1 UHPC Mixture Development and MaterialLevel Experiments
    Utilization of UHPC Bridge Superstructures in Texas— Volume 1: UHPC Mixture Development and Material-Level Experiments
    Hueste, Mary Beth D. ;
    Mukhopadhyay, Anol
    2023-10-01 | PDF
    The use of ultra-high performance concrete (UHPC) in Texas bridges has the potential to add substantial improvements to bridge construction. Advanced material properties and superior durability of UHPC can result in significant design and construction benefits. Within this context, this project evaluated the application of UHPC for precast, pretens ...
  • Financial Achievability Model Operationalization Case Studies and Analysis Summary
    Financial Achievability Model: Operationalization Case Studies and Analysis [Summary]
    Tuck, Jason ;
    Schriefer, Patricia (Born)
    2023-10-01 | PDF
    In a prior research project (BDK83 977-24), the Financial Achievability Model (FAM) was created for the Florida Department of Transportation Research Center. The Research Center can use the FAM in all phases of research to meet strategic objectives, including demonstrating the potential benefits of proposed projects, allowing for a more cost-effect ...
  • Traffic Safety Evaluation of Pedestrians and Bicyclists at Roundabouts in Minnesota
    Traffic Safety Evaluation of Pedestrians and Bicyclists at Roundabouts in Minnesota
    Wagner, Mark ;
    Leuer, Derek
    2023-10-01 | PDF
    By the end of 2022, nearly 450 roundabouts were installed on Minnesota roadways. An evaluation of traffic safety at roundabouts published by MnDOT in 2017 showed substantial decreases in fatal and serious injury crashes for all users at intersections after installation of a roundabout. The safety effects of roundabouts are largely due to geometric ...
  • Adapting Asphalt Mixtures for Tougher Rural Roads Summary
    Adapting Asphalt Mixtures for Tougher Rural Roads [Summary]
    Ulring, Joel D ;
    Barman, Manik
    2023-10-01 | PDF
    Seasonal and daily temperature variations, freeze-thaw cycles and other environmental factors lead to pavement distress on low-volume rural roads. Modifying asphalt mixtures could improve pavement resistance to these environmentally driven distresses. A comparison of the mechanical properties and performances of selected asphalt mixtures identified ...
  • FieldCuring Methods for Evaluating the Strength of Concrete Test Specimens
    Field-Curing Methods for Evaluating the Strength of Concrete Test Specimens
    Solanki, Pranshoo ;
    Xie, Haiyan (Sally)
    2023-10-01 | PDF
    The American Association of State Highway and Transportation Officials R 100 standard provides instructions for making and curing concrete test specimens in the field. However, further research is needed to compare the strength of the field-cured specimen with the strength of the actual in-place concrete item. The purpose of this combined laborator ...
  • OriginDestination Vehicle Counts in Weaving Area Utilizing Existing Field Data
    Origin-Destination Vehicle Counts in Weaving Area Utilizing Existing Field Data
    Chien, Stanley ;
    Christopher, Lauren
    2023-10-01 | PDF
    Vehicle weaving describes the vehicle lane changes in areas between consecutive merge and diverge ramp junctions. During heavy traffic, vehicle weaving will slow down traffic, cause congestion, and increase the possibility of crashes. It is desirable to automatically capture the weaving information using camera videos in the weaving areas. The curr ...
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