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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 2701 - 2720 of 36114 results
  • Evaluation of Work Zone Safety Using the SHRP2 Naturalistic Driving Study Data Volume 2 Description of Research
    Evaluation of Work Zone Safety Using the SHRP2 Naturalistic Driving Study Data – Volume 2 Description of Research
    Hallmark, Shauna ;
    Basulto-Elias, Guillermo
    2022-06-01 | PDF
    This report is one of the deliverables for the culmination of several phases of a project, which evaluated driver behavior in work zones using the SHRP2 Naturalistic Driving Study (NDS) data. This study utilized SHRP2 NDS to evaluate the impact of traffic control devices in reducing driver speed in work zones. The main advantage to the SHPR 2 NDS d ...
  • Utilization of Laser Induced Breakdown Spectroscopy LIBS for RealTime Testing and Quality Control Monitoring of Aggregate Materials used in Highway Construction Final Report
    Utilization of Laser Induced Breakdown Spectroscopy (LIBS) for Real-Time Testing and Quality Control Monitoring of Aggregate Materials used in Highway Construction [Final Report]
    Chesner, Warren H. ;
    Stein, Chris
    2022-06-01 | PDF
    Laser scanning of transportation aggregate materials provides a means to identify aggregate types, sources, and quality in near real-time. The Transportation Pooled Fund (TPF) effort described in this report began as a sequel to a TRB IDEA Program proof of concept laboratory study in 2012, and culminated in the development of the first commercial l ...
  • Specialized Safety Training for KYTC Construction and Maintenance Personnel
    Specialized Safety Training for KYTC Construction and Maintenance Personnel
    Dadi, Gabriel B. ;
    Ammar, Ashtarout
    2022-06-01 | PDF
    High-quality safety training is critical for educating employees in the highway construction and maintenance industry about workplace hazards and giving them tools to remove and/or minimize associated risks. But researchers and state transportation agencies have not committed enough resources to develop safety trainings that address the unique need ...
  • AgBased Deicing Additives December 2022
    Ag-Based Deicing Additives [December 2022]
    Fay, Laura ;
    Bell, Matthew
    2022-06-01 | PDF
    The objective of this project is to assist Colorado Department of Transportation (CDOT) in the identification of regionally sourced agricultural co- or by-product deicer additives that will enhance corrosion protection and provide added deicing performance and longevity to road surfaces. A literature review provides a summary of agriculturally deri ...
  • Statewide Implementation of Regionally Adapted Native Seeds
    Statewide Implementation of Regionally Adapted Native Seeds
    Pawelek, Keith A ;
    Wayland, Tyler C
    2022-06-01 | PDF
    Mandated by multiple federal executive orders and the Clean Water Act, native seeds must be used, when available, to prevent erosion following construction activities on highway rights-of-ways. Historically, native seeds have resulted in marginal performance across much of the state, and there have been insufficient commercially available native se ...
  • Measuring Explosive Airblast of Remote Avalanche Control Systems RACS
    Measuring Explosive Airblast of Remote Avalanche Control Systems (RACS)
    Larson, Robb ;
    Seitz, Brandt
    2022-06-01 | PDF
    Ski areas and departments of transportation routinely use a variety of explosives-based and gas-based systems to generate overpressures resulting in loads sufficient to initiate snow avalanches. Various investigators including Johnson, Gubler, Miller and Simione, explored phenomenon such as effect of blast height on snowpack response, snowpack acce ...
  • Noninvasive Sensor Deployment in Aurora Member States
    Non-invasive Sensor Deployment in Aurora Member States
    Hans, Zach ;
    Sassani, Alireza
    2022-06-01 | PDF
    This project pursued a large-scale effort to deploy non-invasive sensors adjacent to invasive sensors (embedded in the pavement) located at existing road weather information system (RWIS) stations and to consider agency suitability between the different sensors. While some RWIS stations may have multiple invasive sensors measuring pavement temperat ...
  • Performance Evaluation of SP95 and SP125 Superpave Mixtures
    Performance Evaluation of SP-9.5 and SP-12.5 Superpave Mixtures
    Hu, Sheng ;
    Zhou, Fujie
    2022-06-01 | PDF
    Current Florida Department of Transportation specifications allow the use of Superpave (SP)-12.5/Friction Course (FC)-12.5 mixtures in heavy traffic levels (e.g., level E), but not SP-9.5/FC-9.5 mixtures. The main goal of this project is to compare the performance of SP-9.5/FC-9.5 to SP-12.5/FC-12.5 Superpave asphalt mixtures and then determine if ...
  • A Pavement Marking Inventory and Retroreflectivity Condition Assessment Method Using Mobile LiDAR
    A Pavement Marking Inventory and Retroreflectivity Condition Assessment Method Using Mobile LiDAR
    Ai, Chengbo ;
    Hennessy, Emily
    2022-06-01 | PDF
    FHWA is proposing regulations to guide minimum pavement marking retroreflectivity levels, which poses a potential challenge to MassDOT, as the current practice of visual inspection is labor intensive, and the results can be subjective. To address the identified challenges and needs from MassDOT, the objective of this research is twofold: (1) to ser ...
  • Evaluation of Embedded Pile Resistance of Scour Critical Bridges Research Project Capsule 223ST
    Evaluation of Embedded Pile Resistance of Scour Critical Bridges: Research Project Capsule [22–3ST)
    Abu-Farsakh, Murad Y. ;
    Rupnow, Tyson
    2022-06-01 | PDF
    The main objective of this research study is to explore methods and techniques to accurately determine the capacity of in-place piles for in-service bridge structures, especially for those that are under severe scour conditions. Many existing scour critical bridges were built decades ago, and pile setup phenomenon is significant. Proposed methodolo ...
  • Snowplow Operations Management System Final Report
    Snowplow Operations Management System: Final Report
    Shahandashti, Mohsen ;
    Mattingly, Stephen
    2022-06-01 | PDF
    Winter road maintenance accounts for approximately 20% of state departments of transportation’s maintenance budgets; states and local highway agencies spend an average of $2.3 billion on winter operations every year. Nevertheless, over 5 million vehicle crashes occur in the U.S. each year, and approximately 21% of these crashes happen in the presen ...
  • Buried Concrete Barrier Ends in Washington State
    Buried Concrete Barrier Ends in Washington State
    Abbott, Paul ;
    van Schalkwyk, Ida
    2022-06-01 | PDF
    There are over 400 buried concrete barrier ends on Washington state routes. While buried concretebarrier ends are no longer included in standard plans, it is not well understood how vehicles are interacting with these structures. An inventory of buried concrete barrier ends was matched with crash data sourced from the WSDOT Engineering Crash Datama ...
  • Reduce VehicleAnimal Collisions With Installation of Small Animal Exclusion Fencing
    Reduce Vehicle-Animal Collisions With Installation of Small Animal Exclusion Fencing
    Markle, Tricia ;
    Stapleton, Seth
    2022-06-01 | PDF
    The presence of small animals on Minnesota’s roadways presents a public safety concern and negatively impacts wildlife populations. For the past four years, the Minnesota Zoo has partnered with the Minnesota Department of Transportation to test and evaluate the effectiveness of standard plans for small animal exclusion fencing, with the goal of red ...
  • Steel Bridge Coating Inventory for 2022
    Steel Bridge Coating Inventory for 2022
    Goff, Christopher ;
    Palle, Sudhir
    2022-06-01 | PDF
    The Kentucky Transportation Cabinet (KYTC) has replaced the lead-based coatings on many of its steel bridges over the past 30 years. In the 1980s and 1990s, inorganic zinc primers with vinyl topcoats were the go-to option for coating replacement projects. Since 2000, the typical choice for these projects has been organic zinc primers that are part ...
  • Utilization of Lidar Technology When to Use It and Why
    Utilization of Lidar Technology — When to Use It and Why
    McIntosh, Levi ;
    Rister, Brad
    2022-06-01 | PDF
    Lidar technologies can assist transportation agencies during the design, construction, and maintenance phases of transportation projects. While Lidar has numerous applications, successfully deploying Lidar technologies is only possible if agencies have a solid understanding of their use cases and potential limitations. This report offers guidance t ...
  • Novel Methods for Adding Rejuvenators in Asphalt Mixtures with High Recycled Binder Ratios
    Novel Methods for Adding Rejuvenators in Asphalt Mixtures with High Recycled Binder Ratios
    Yin, Fan ;
    Langan, Mariah
    2022-06-01 | PDF
    The overall objective of this study was to explore three novel rejuvenator application methods using the emulsion and foaming technologies and determine their impacts on the workability and long-term cracking resistance of high-reclaimed asphalt pavement (RAP) asphalt mixtures. To that end, a comprehensive experimental plan was developed, which con ...
  • Improving Scaling Resistance of Pavement Concrete Using Titanium Dioxide TiO2 and Nanosilica
    Improving Scaling Resistance of Pavement Concrete Using Titanium Dioxide (TiO2) and Nanosilica
    Huang, Dan ;
    Velay-Lizancos, Mirian
    2022-06-01 | PDF
    This project focused on the evaluation of the influence of nanoadditives on the hydration kinetics, mechanical properties, and durability of concretes with and without supplementary cementitious materials (SCMs). The types of nanomaterials used in the course of this study included nano-titanium dioxide (nano-TiO2) and two forms of nanosilica. A ser ...
  • Stream Wetland Mitigation Forecasting Developing a Predictive Model for Faster Project Delivery and CostSavings
    Stream & Wetland Mitigation Forecasting: Developing a Predictive Model for Faster Project Delivery and Cost-Savings
    Toman, Elizabeth Myers ;
    Xu, Haiqing
    2022-06-01 | PDF
    Wetlands and streams provide significant ecological and societal services. Accurate mapping of their locations is necessary for ODOT to plan for avoidance or mitigation efforts and costs. The National Wetland Inventory (NWI) provides the best nationwide spatial database of wetlands, but the database has not been updated for up to four decades and m ...
    Supporting Files
  • Evaluation of Polymer Binder Technisoil G5 in Concrete Mixture
    Evaluation of Polymer Binder Technisoil G5® in Concrete Mixture
    Saadeh, Shadi ;
    Katawal, Pritam
    2022-06-01 | PDF
    Plastic is everywhere, and with its increasing use in so many everyday materials, the production and demand of plastic has skyrocketed. Unfortunately, this has resulted in the accumulation of a mammoth amount of plastic waste and adverse effects on the environment. To optimize the huge amount of materials required by the pavement industry each year ...
  • Stream Wetland Mitigation Forecasting Developing a Predictive Model for Faster Project Delivery and CostSavings Fact Sheet
    Stream & Wetland Mitigation Forecasting: Developing a Predictive Model for Faster Project Delivery and Cost-Savings [Fact Sheet]
    Toman, Elizabeth Myers ;
    Xu, Haiqing
    2022-06-01 | PDF
    Wetlands and streams provide numerous ecosystems services and are protected under federal and state laws. These regulations require permits when fill material is discharged into regulated streams and wetlands from roadway construction and maintenance activities, which also can require compensatory mitigation. Environmental review, permitting, and m ...
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