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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 2481 - 2500 of 36114 results
  • Enhanced Entrained Air Void System Characterization for Durable Highway Concrete
    Enhanced Entrained Air Void System Characterization for Durable Highway Concrete
    Torres, Anthony ;
    Aguayo, Federico
    2022-09-01 | PDF
    The air void system in concrete provides a strong influence on the behavior of cementitious materials in both the fresh and hardened state, especially as it relates to freeze-thaw resistance and deicer scaling. The most common test procedure to characterize the air void system is ASTM C457 – Standard Test method for Microscopical Determination of P ...
  • Mapping Subsurface Conditions for Transportation Applications
    Mapping Subsurface Conditions for Transportation Applications
    Wood, Clinton M. ;
    Barry, Michelle L
    2022-09-01 | PDF
    Geophysical methods including Multichannel Analysis of Surface Waves (MASW) using both Rayleigh and Love waves, P-wave refraction, Horizontal to Vertical Spectral Ratio (HVSR), Capacitively-Coupled Resistivity (CCR), Electrical Resistivity Tomography (ERT), Ground Penetration Radar (GPR), and Electromagnetic Ground Conductivity (EM31) were used for ...
  • The Spatial Dilemma of Sustainable Transportation and Just Affordable Housing Part II LowIncome Housing Tax Credits
    The Spatial Dilemma of Sustainable Transportation and Just Affordable Housing: Part II, Low-Income Housing Tax Credits
    Ong, Paul M. ;
    Pech, Chhandara
    2022-09-01 | PDF
    This study examines the spatial distribution of Low-income Housing Tax Credit (LIHTC) units to understand whether geographic patterns and trends are consistent with climate change and equity goals. The analysis compares the location of LIHTC units in 2012 and net changes from 2012 to 2019 with a number of transportation, environmental, and racial a ...
  • Steel Reinforcement Section Loss Guidance Tables
    Steel Reinforcement Section Loss Guidance Tables
    Shafei, Behrouz ;
    Shi, Weizhuo
    2022-09-01 | PDF
    The strength and durability of reinforced concrete (RC) bridges are adversely affected by the deterioration of their structural members. When investigating bridges in need of maintenance and repair, the deterioration due to the corrosion of steel rebars is commonly found to be a primary source of structural damage and degradation. To ensure the saf ...
  • Retrospective User Survey for a Rural Electric Vehicle Carsharing Pilot in Californias Central Valley
    Retrospective User Survey for a Rural Electric Vehicle Carsharing Pilot in California’s Central Valley
    Harold, Brian ;
    Rodier, Caroline
    2022-09-01 | PDF
    Rural areas in California present unique transportation challenges associated with long travel distances, infrequent transit service, the cost of car ownership, and limited access to app-based rideshare services that are common to more populated urban centers. Researchers at the University of California, Davis, partnered with the eight San Joaquin ...
  • The Spatial Dilemma of Sustainable Transportation and Just Affordable Housing Part I Housing Choice Vouchers
    The Spatial Dilemma of Sustainable Transportation and Just Affordable Housing: Part I, Housing Choice Vouchers
    Ong, Paul M. ;
    Pech, Chhandara
    2022-09-01 | PDF
    This study examines the spatial distribution of tenant-based Housing Choice Voucher (Section 8) units to understand whether geographic patterns and trends are consistent with climate change and equity goals. The analysis compares the location of HCV units in 2012 and net changes from 2012 to 2019 with a number of transportation, environmental, and ...
  • Development of Guidelines for Inspection Repair and Use of Portable Concrete BarriersVolume 1 Technical Report
    Development of Guidelines for Inspection, Repair, and Use of Portable Concrete Barriers—Volume 1: Technical Report
    Dobrovolny, Chiara Silvestri ;
    Bhutani, Shristi
    2022-09-01 | PDF
    Defining the service life of portable concrete barriers (PCBs) is important to reduce the risk of inferior, unsafe barriers being used on Texas roadways. The Manual for Assessing Safety Hardware (MASH) implementation agreement allows state transportation agencies to continue the use of PCBs manufactured on or before December 31, 2019, and successfu ...
  • 3D Image Analysis Using Deep Learning for Size and Shape Characterization of Stockpile Riprap AggregatesPhase 2
    3D Image Analysis Using Deep Learning for Size and Shape Characterization of Stockpile Riprap Aggregates—Phase 2
    Huang, Haohang ;
    Tutumluer, Erol
    2022-09-01 | PDF
    Riprap rock and aggregates are extensively used in structural, transportation, geotechnical, and hydraulic engineering applications. Field determination of morphological properties of aggregates such as size and shape can greatly facilitate the quality assurance/quality control (QA/QC) process for proper aggregate material selection and engineering ...
  • Traffic Safety Facts 2020 Data 2020 State Traffic Data
    Traffic Safety Facts 2020 Data: 2020 State Traffic Data
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2022-09-01 | National Transportation Statistics (NTS) | PDF
    This fact sheet contains information on fatal motor vehicle traffic crashes based on data from the Fatality Analysis Reporting System (FARS). Refer to the end of this publication for more information on FARS.
  • Longterm Performance of HES Class 50AF Concrete with Polypropylene Fibers as FieldCast Connection between Deck BulbT Girders in SH36 Bridge over Bear River
    Long-term Performance of HES Class 50AF Concrete with Polypropylene Fibers as Field-Cast Connection between Deck Bulb-T Girders in SH-36 Bridge over Bear River
    Ebrahimpour, Arya ;
    Mashal, Mustafa
    2022-09-01 | PDF
    Idaho Transportation Department (ITD) has been using High-Early Strength (HES) concrete Class 50AF with Polypropylene fibers in several parts of the bridge in Accelerated Bridge Construction. This material is only slightly more expensive than conventional concrete, but speeds up the construction. ITD is interested in the suitability of HES concrete ...
  • 2022 Summary of Special Pavement Test Sections
    2022 Summary of Special Pavement Test Sections
    Uhlmeyer, Jeff ;
    Russell, Mark
    2022-09-01 | PDF
    WSDOT continued to collect rutting/wear and smoothness information on a number of completed studies. This report summarizes those studies. • Open Graded Friction Courses: OGFC-AR on I-405 was more susceptible to wear than either OGFC-SBS or HMA matching the pattern seen in the I-5 and SR-520 quieter pavement test sections. • Concrete Performance an ...
  • Evaluation of TwoDimensional 2D Hydraulic Models to Improve Scour Predictions and Countermeasures
    Evaluation of Two-Dimensional (2D) Hydraulic Models to Improve Scour Predictions and Countermeasures
    Castro-Bolinaga, Celso ;
    Sayde, Chadi
    2022-09-01 | PDF
    The overall goal of this research project was to examine the capabilities of FO-DTS and 2D hydraulic models for improving the prediction of scour depths at bridge foundations. To accomplish this goal, the following specific objectives were addressed: (1) to develop, test, and deploy scour monitoring devices based on FO-DTS capable of tracking chang ...
  • Enhanced GIS Legacy Database for TDOT Legacy Data Phase III Power BI Applications
    Enhanced GIS Legacy Database for TDOT Legacy Data Phase III: Power BI Applications
    Allen, Madeline ;
    Abkowitz, Mark
    2022-09-01 | PDF
    TDOT has embarked on an initiative to develop data analytics and visualization capabilities using the Microsoft Power BI platform to serve the agency’s needs. Critical to the success of this initiative is the ability to identify, develop and serve a range of applications across TDOT’s various divisions, covering a variety of operating modes within ...
  • Investigation of Illegal Weigh Station Bypassing
    Investigation of Illegal Weigh Station Bypassing
    Brown, Mallory ;
    Martin, Andrew
    2022-09-01 | PDF
    This study recommends best practices to curb illegal weigh station bypassing by commercial motor vehicles (CMVs). Analysis of historical data collected by Kentucky State Police – Commercial Vehicle Enforcement (KSP-CVE) for 2017-2021 revealed that CMV drivers were charged with illegally bypassing weigh stations 2,616 times. Drivers were charged wit ...
  • Phase 1 Development of County Bridge Standards for Single Span Concrete Slab Bridges
    Phase 1: Development of County Bridge Standards for Single Span Concrete Slab Bridges
    Fleming, Bradley ;
    Opheim, Joshua
    2022-09-01 | PDF
    Nearly 10.5% of all highway bridges in the United States are classified as concrete slab bridges according to the U.S. 2020 National Bridge Inventory (NBI). Concrete slab bridges are typically single spans (20-50 feet) or multiple spans for relatively short stream crossings. The Iowa Department of Transportation (Iowa DOT) currently has three-span ...
  • Steel Bridge Coating Evaluation and Rating Criteria
    Steel Bridge Coating Evaluation and Rating Criteria
    Bowman, Mark D. ;
    Hagan, Bryan D
    2022-09-01 | PDF
    The aim of the study is to gather information on three topics: (1) the evaluation and rating of steel bridge protective coatings, (2) coating systems used by various states throughout the United States, and (3) maintenance painting procedures employed by various state department of transportation agencies (DOTs). First, it was found that most state ...
  • US Department of Transportation DEIA Strategic Plan Advancing Diversity Equity Inclusion and Accessibility
    U.S. Department of Transportation DEIA Strategic Plan: Advancing Diversity, Equity, Inclusion, and Accessibility
    United States. Department of Transportation
    2022-09-01 | PDF
    On June 25, 2021, President Biden signed Executive Order (EO) 14035, Advancing Diversity, Equity, Inclusion, and Accessibility (DEIA) in the Federal Workforce. This EO launched a whole-of-government initiative to cultivate a federal workforce that draws from the full diversity of the Nation and advances equitable employment opportunities. The EO re ...
  • Assessing the Economic Effects of ContextSensitive Main Street Highways in Small Cities
    Assessing the Economic Effects of Context-Sensitive Main Street Highways in Small Cities
    Fonseca-Sarmiento, Camila ;
    Zeerak, Raihana
    2022-09-01 | PDF
    Complete Streets is a transportation policy and design approach that requires streets to be planned, designed, operated, and maintained to enable safe, convenient, and comfortable travel and access for users of all ages and abilities regardless of their mode of transportation. While there have been multiple studies on Complete Streets in metropolit ...
  • Statistical Inference for Multimodal Travel Time Reliability
    Statistical Inference for Multimodal Travel Time Reliability
    Unnikrishnan, Avinash ;
    Kochar, Subash
    2022-09-01 | PDF
    Travel time reliability is a key metric of interest to practitioners and researchers because it affects travel choice and the economic competitiveness of urban areas. This research focuses on three travel time reliability metrics – buffer index, modified buffer index, and the relative width of travel time distributions. The key novel contributions ...
  • Using Automated Traffic Signal Performance Measures To Improve Signal Timings
    Using Automated Traffic Signal Performance Measures To Improve Signal Timings
    Li, Xiugang
    ORCID ICON IMG
    2022-09-01 | PDF
    This report describes the use of automated traffic signal performance measures for Oregon Department of Transportation. The report presents case studies of signal coordination and running yellow and red lights.
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