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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 6601 - 6620 of 36104 results
  • Establishing Percent Embedment Limits to Improve Chip Seal Performance
    Establishing Percent Embedment Limits to Improve Chip Seal Performance
    Boz, Ilker ;
    Kumbargeri, Yogesh
    2018-08-15 | PDF
    Long-term performance of a chip seal treatment is affected by several factors including the type and morphology of the aggregates, emulsion/binder type and most importantly, the microstructural characteristics such as the percent embedment and aggregate orientation. As part of a previous MDOT project (OR15-508), a methodology (and a software named ...
  • Routing Policy Choice Models in Stochastic TimeDependent Networks The Stockholm Case Study
    Routing Policy Choice Models in Stochastic Time-Dependent Networks: The Stockholm Case Study
    Gao, Song
    2018-08-14 | PDF
    Transportation networks are frequently subject to random disruptions such as incidents and bad weather, resulting in variable and unpredictable traffic conditions. According to the 2015 Urban Mobility Scorecard, traffic congestion in the United States cost 160 billion dollars in 2014. Meanwhile, with the fast development of sensor and telecommunica ...
  • Dynamic Subcomponent Testing and Finite Element Simulation of Guardrail Systems with Alternative Post Installation Methodologies
    Dynamic Subcomponent Testing and Finite Element Simulation of Guardrail Systems with Alternative Post Installation Methodologies
    Scott, David ;
    Stewart, Lauren
    2018-08-10 | PDF
    This report details the results of an experimental and numerical investigation into the performance of guardrail posts driven through asphalt layers. Dynamic subcomponent tests were performed on a number of post/asphalt layer configurations. The dynamic test results were used to develop performance criteria to indicate expected levels of restraint ...
  • Enhancing the Fundamental Knowledge and Use of Asphalt Emulsions Using Systematic Scientific and Engineering Approaches Tech Transfer Summary
    Enhancing the Fundamental Knowledge and Use of Asphalt Emulsions Using Systematic Scientific and Engineering Approaches: Tech Transfer Summary
    Buss, Ashley
    ORCID ICON IMG
    2018-08-06 | PDF
    Asphalt emulsions are gaining in popularity in the US and worldwide due to their lower application temperature, lower energy consumption, and lower viscosity than hot applied asphalts. About 3 million tons of emulsion is produced in the US, which accounts for 5% to 10% of the total asphalt consumption. However, much of the available information on ...
  • CottonDerived Composite Materials for Climate Resilient Transportation Infrastructure
    Cotton-Derived Composite Materials for Climate Resilient Transportation Infrastructure
    Abidi, Noureddine ;
    Jayawickrama, Priyantha W.
    2018-08-06 | PDF
    This report summarizes the results of completed project entitled “Cotton- Derived Composite Materials for Climate Resilient Transportation Infrastructure”. Here, we aimed to develop high performance and economically facile natural fiber-reinforced transportation infrastructure. The main three tasks of this project include: (1) preparation of cotton ...
  • Permeable Pavement Road Map Workshop and Proposed Road Map for Permeable Pavement
    Permeable Pavement Road Map Workshop and Proposed Road Map for Permeable Pavement
    Harvey, John ;
    Smith, David
    2018-08-01 | PDF
    In early 2017, the University of California Pavement Research Center (UCPRC) and the National Center for Sustainable Transportation (NCST), working with the Interlocking Concrete Pavement Institute (ICPI), identified gaps in knowledge and other barriers to wider implementation that were perceived to be holding back the full potential for deployment ...
  • DataDriven Highway Infrastructure Resilience Assessment
    Data-Driven Highway Infrastructure Resilience Assessment
    Rahdar, Mohammad ;
    Hu, Guiping
    2018-08-01 | PDF
    The transportation systems sector, one of the most critical infrastructure sectors in the US, has a subsector of highway and motor carrier industries that supports daily activities and emergency actions by providing services to other critical infrastructure segments such as healthcare and public health, emergency services, manufacturing, food and a ...
  • Electric Vehicle Ownership Factors and Commuting Behavior in the United States Environmental Attributes of Electric Vehicle Ownership and Commuting Behavior in Maryland Public Policy and Equity Considerations
    Electric Vehicle Ownership Factors and Commuting Behavior in the United States: Environmental Attributes of Electric Vehicle Ownership and Commuting Behavior in Maryland: Public Policy and Equity Considerations
    Farkas, Andrew ;
    Shin, Hyeon-Shic
    2018-08-01 | PDF
    This research investigated the socio-demographic attributes that contribute to electric vehicle (EV) ownership and EV owners’ commuting behavior based on different types of developed human settlements such as city, suburb, and rural area. EVs still are pricier than comparable internal combustion engine vehicles (ICEVs). The objective of this study ...
  • Enhancing School Zone and School Bus Safety
    Enhancing School Zone and School Bus Safety
    Lee, Jaeyoung ;
    Abdel-Aty, Mohamed
    2018-08-01 | PDF
    Safety issues in school zone areas have been one of the most important topics in the traffic safety field. This research project assesses the safety effects of different roadway countermeasures in school zone areas. Although many studies have evaluated the effectiveness of various traffic control devices (e.g., sign, flashing beacon, speed monitori ...
  • Bridge Load Posting Based on Actual Arkansas Truck Traffic
    Bridge Load Posting Based on Actual Arkansas Truck Traffic
    Heymsfield, Ernest P. ;
    Hernandez, Sarah
    2018-08-01 | PDF
    Bridge load posting limits are a safety and economic decision. Bridge load posting limits restrict truck traffic to ensure safety. Therefore, trucks that exceed bridge load posting limits are required to take alternate routes. The Arkansas Department of Transportation (ARDOT) uses a family of CMV (commercial motor vehicle) configurations and loadin ...
  • Applications of Partial Depth Precast Concrete Deck Panels on Horizontally Curved Steel and Concrete Bridges
    Applications of Partial Depth Precast Concrete Deck Panels on Horizontally Curved Steel and Concrete Bridges
    Roskos, Colter ;
    Biju-Duval, Paul
    2018-08-01 | PDF
    Horizontally curved bridges are commonly used for direct connectors at highway intersections as well as other applications. The majority of curved bridges utilize continuous steel curved I-girder or tub girder systems. In recent years, isolated applications of spliced prestressed concrete U-beams have been successfully used for curved bridge applic ...
  • Optimization of the Design of Flexible Pavements with Unbound Bases Reinforced with Geogrids using Accelerated Pavement Testing
    Optimization of the Design of Flexible Pavements with Unbound Bases Reinforced with Geogrids using Accelerated Pavement Testing
    Sankaranarayanan, Subramanian ;
    Zornberg, Jorge G.
    2018-08-01 | PDF
    The design of flexible pavements with geosynthetic-stabilized unbound base layers is evaluated using accelerated pavement testing. The evaluation also assesses use of KSGI as a parameter governing the performance of the pavement system. The major components of this project include: (i) Field monitoring of geosynthetic-stabilized and control pavemen ...
  • Extension of Safety Assessment Tool for Construction Work Zone Phasing Plans
    Extension of Safety Assessment Tool for Construction Work Zone Phasing Plans
    Brown, Henry ;
    Sun, Carlos
    2018-08-01 | PDF
    Engineering practitioners must balance safety and mobility when evaluating different construction phasing alternatives for highway work zones. There is a need for practitioner guidance and practical tools to assess work zone safety impacts as such resources are currently lacking. The objective of the study was to extend a structured safety assessme ...
  • Operating Performance of Diverging Diamond Interchanges
    Operating Performance of Diverging Diamond Interchanges
    Guin, Angshuman ;
    Hunter, Michael
    2018-08-01 | PDF
    As the result of changing traffic patterns, many conventional intersections and interchanges can no longer accommodate growing traffic volumes and heavy turning movements. In response, there are various innovative intersection and interchange designs proposed and implemented to better accommodate these changes, and the diverging diamond interchange ...
  • Development of a Freight System Conceptualization and Impact Assessment FreSCANDIA Framework
    Development of a Freight System Conceptualization and Impact Assessment (Fre-SCANDIA) Framework
    Jaller, Miguel ;
    Harvey, John
    2018-08-01 | PDF
    The freight system is a key component of California’s economy, but it is also a critical contributor to a number of externalities. Different public agencies, private sector stakeholders, and academia engaged in the development of the California Sustainable Freight Action Plan (CSFAP). This plan put forward a number of improvement trategies/policies ...
  • Comparison of Performances of Structural Fibers and Development of a Specification for Using Them in Thin Concrete Overlays
    Comparison of Performances of Structural Fibers and Development of a Specification for Using Them in Thin Concrete Overlays
    Barman, Manik ;
    Hansen, Bryce
    2018-08-01 | PDF
    Structural fibers improve the long-term performance of concrete pavements and overlays and potentially are useful to reduce the slab thickness. These fibers are available in different parent material compositions, stiffness, shapes, and aspect ratios. The main objective of this study was to characterize the post-crack flexural and joint performance ...
  • Application of Region Specific Depreciation Formulas in Highway Capital Stocks Evidence from New York and New Jersey
    Application of Region Specific Depreciation Formulas in Highway Capital Stocks: Evidence from New York and New Jersey
    Kalan, Onur
    2018-08-01 | PDF
    Highways are significant instruments for transportation in United States, and the common opinion is that increasing highway networks leads to major changes in economic development. In general, the quantification of the highways is performed by capital stock approach in monetary terms. In capital theory, the increase of the stock value can be calcul ...
  • Spatial Analysis of Accessible Seating Area on the Next Generation Passenger Rail Cars Using 3D Modeling and Digital Human Modeling
    Spatial Analysis of Accessible Seating Area on the Next Generation Passenger Rail Cars Using 3-D Modeling and Digital Human Modeling
    Hunter-Zaworski, K M ;
    Tabattanon, K
    2018-08-01 | PDF
    This project extended research that was conducted for the Federal Railroad Administration (FRA) in collaboration with the Passenger Rail Investment and Improvement Act Next Generation Equipment Committee on the development of specifications for the next generation of passenger rail cars. The FRA research project conducted a preliminary spatial anal ...
  • From Trip Data to the Energy Requirements of Personal Vehicle Travel
    From Trip Data to the Energy Requirements of Personal Vehicle Travel
    Trancik, Jessika
    2018-08-01 | PDF
    This research project is intended to compare the cost effectiveness and energy efficiency of different powertrain technologies given realistic travel behavior and technological performance. Our goal is to better understand what technological and behavioral changes would need to occur in order to reduce the carbon emissions of the personal transport ...
  • Outsourcing of Laboratory Testing and Inspection Activities at State Transportation Agencies Synthesis of Current Practices
    Outsourcing of Laboratory Testing and Inspection Activities at State Transportation Agencies: Synthesis of Current Practices
    Carlson, David ;
    Ranka, Bhavik
    2018-08-01 | PDF
    Outsourcing of project activities at State Transportation Agencies (STA) to the private sector has become ubiquitous over the last several decades. This trend of increased outsourcing is primarily driven by the continued demand for public transportation infrastructure coupled with static or declining levels of in-house STA employees. Many prior stu ...
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