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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 8001 - 8020 of 36151 results
  • Statewide Analysis of Bicycle Crashes
    Statewide Analysis of Bicycle Crashes
    Alluri, Priyanka
    2017-06-01 | PDF
    An extensive literature review was conducted to locate existing studies in four areas: (1) risk factors that affect the frequency and severity of bicycle crashes; (2) bicycle crash causes, patterns, and contributing factors; (3) network screening methods used to identify and prioritize bicycle hot spots; and (4) safety performance of the most commo ...
  • Analytical Investigation into Bridge Column Innovations for Mitigating Earthquake Damage
    Analytical Investigation into Bridge Column Innovations for Mitigating Earthquake Damage
    Nada, Hisham ;
    Sanders, David H.
    2017-06-01 | PDF
    Current seismic bridge design is based on columns designed to be the sacrificial elements during earthquake excitation. This design philosophy capacity protects the bridge foundations, connections and superstructures while causing a lot of damage to the columns during large seismic events. Despite that this concept proved to be successful in bridge ...
  • An Investigation of Minimum Information Requirements for an Unmanned Aircraft System Detect and Avoid Traffic Display
    An Investigation of Minimum Information Requirements for an Unmanned Aircraft System Detect and Avoid Traffic Display
    Williams, Kevin W. ;
    Caddigan, Eamon
    2017-06-01 | PDF
    A study was conducted to support the development of Minimum Operational Performance Specifications for UAS Detect and Avoid traffic displays being developed by RTCA Special Committee 228. The study involved over 1,000 traffic encounters across 32 participants. Data collection began January 20th, 2016, and was completed on April 1st, 2016. The exper ...
  • Largescale linear programs in planning and prediction
    Large-scale linear programs in planning and prediction.
    Caramanis, Constantine
    2017-06-01 | PDF
    Large-scale linear programs are at the core of many traffic-related optimization problems in both planning and prediction. Moreover, many of these involve significant uncertainty, and hence are modeled using either chance constraints, or robust optimization. Chance constraints and robust optimization are by now classical approaches for dealing with ...
  • Longterm Performance of Granular Bases Including the Effect of WetDry Cycles on Inverted Base Pavement Performance
    Long-term Performance of Granular Bases Including the Effect of Wet-Dry Cycles on Inverted Base Pavement Performance
    Frost, J. David
    2017-06-01 | PDF
    The main objective of this study was to advance the understanding of alternative pavement designs. In particular, potential techniques such as inverted base pavements (IBP) have increased the importance of granular aggregate bases (GAB) in pavement structures. While extensive research has been conducted on the resilient behavior of GAB’s, their lon ...
  • Enhanced culvert inspections best practices guidebook final report
    Enhanced culvert inspections - best practices guidebook : final report.
    Youngblood, Doug
    2017-06-01 | PDF
    Culvert inspection is a key enabler that allows MnDOT to manage the state’s highway culvert system. When quantitative detail on culvert condition is required, an inspector will need to use enhanced inspection technologies. Enhanced inspection technologies such as; laser ring profiling, sonar, inclinometer, mandrel, hammer sound testing, core sampli ...
  • Wood Stork Use of Roadway Corridor Features in South Florida Project Summary
    Wood Stork Use of Roadway Corridor Features in South Florida: [Project Summary]
    Gawlik, Dale E.
    2017-06-01 | PDF
    The wood stork is the only stork that breeds in the U.S. In 1984, the wood stork was listed as an endangered species. In 2014, its status was changed to threatened, indicating the success of thirty years of conservation efforts. The wood stork is an important indicator of the overall health of the Everglades and the South Florida ecosystem. To cont ...
  • Investigation of UltraHigh Performance Concrete for Longitudinal Joints in Deck Bulb Tee Bridge Girders
    Investigation of Ultra-High Performance Concrete for Longitudinal Joints in Deck Bulb Tee Bridge Girders
    Peruchini, Timothy John ;
    Stanton, John
    2017-06-01 | PDF
    In recent decades, many state DOTs have implemented ultra-high performance concrete (UHPC) in bridge construction because of its advanced mechanical properties beyond those of conventional concrete. The Federal Highway Administration (FHWA) has extensively tested a proprietary class of UHPC, but WSDOT has been hesitant to adopt this mix because of ...
  • Slope stabilization guide for Minnesota local government engineers
    Slope stabilization guide for Minnesota local government engineers.
    Saftner, David ;
    Carranza-Torres, Carlos
    2017-06-01 | PDF
    This user guide provides simple, cost‐effective methods for stabilizing locally maintained slopes along roadways in Minnesota. Eight slope stabilization techniques are presented that local government engineers can undertake using locally available materials and equipment. These methods are the result of a research effort that analyzed recent slope ...
  • Evaluation of static resistance of deep foundation project summary
    Evaluation of static resistance of deep foundation [project summary].
    McVay, Michael
    2017-06-01 | PDF
    Various types of deep foundations were investigated including steel H-piles, pre-stressed concrete piles, open cylindrical steel and concrete piles with diameters greater than 36 inches, and drilled shafts with partial length permanent casing.The researchers collected a substantial amount of field data to use in evaluating FB-Deep’s performance. Fi ...
  • A driving simulator investigation of road safety risk mitigation under reduced visibility final report
    A driving simulator investigation of road safety risk mitigation under reduced visibility : final report.
    Abdel-Aty, Mohamed Ahmed ;
    Wu, Yina
    2017-06-01 | PDF
    The effect of low visibility on both crash occurrence and severity is a major concern in the traffic safetyfield. It is known that crashes tend to be more severe in low visibility conditions than under normal clearconditions. Thus, there is a drastic need to evaluate low visibility countermeasures to improve driversafety and performance under reduc ...
  • Advanced Methodology to Determine Highway Construction Cost Index HCCI
    Advanced Methodology to Determine Highway Construction Cost Index (HCCI)
    Gransberg, Douglas ;
    Shrestha, Joseph K.
    2017-06-01 | PDF
    A highway construction cost index (HCCI) is an indicator of the purchasing power of a highway agency. Thus, it must reflect the actual construction market conditions. However, the current method used by MDT is not robust enough to meet this primary goal due to (1) a significantly insufficient sample size of bid items used in HCCI calculation and (2 ...
    Supporting Files
  • Development of Educational Professional Training Modules on GreenSustainability Design Rating Systems for Neighborhood Development Transportation 2017
    Development of Educational & Professional Training Modules on Green/Sustainability Design & Rating Systems for Neighborhood Development & Transportation [2017]
    Peters, Robert W. ;
    Sisiopiku, Virginia P.
    2017-06-01 | PDF
    While the importance of sustainability is well recognized by practicing and academic professionals alike, Civil Engineering curricula do not typically offer courses covering or addressing sustainability design principles and assessment methodologies. To bridge this gap, this report discusses the development and pilot testing of a course on “Sustain ...
  • Development of Protocols and Instrumentation Plan for Accelerated Structural Testing Facility
    Development of Protocols and Instrumentation Plan for Accelerated Structural Testing Facility
    Moon, Franklin ;
    Maher, Ali
    2017-06-01 | PDF
    Long-term bridge performance is currently not well understood. In practice, engineers are forced to rely heavily on expert opinion, anecdotal experiences, and generalizations. This research project served as step 1 in the master plan to retrieve critical, quantitative bridge deterioration data. The infusion of NDE, temperature, strain, and other cr ...
  • The use of a driving simulator to determine how time pressures impact driver aggressiveness
    The use of a driving simulator to determine how time pressures impact driver aggressiveness.
    Knodler, Michael A. ;
    Samuel, Siby
    2017-06-01 | PDF
    Speeding greatly contributes to traffic safety with approximately a third of fatal crashes in the UnitedStates being speeding-related. Previous research has identified being late as a primary cause ofspeeding. In this driving simulator study, a virtual drive was constructed to evaluate how time pressures,or hurried driving, affected driver speed ch ...
  • What Do Americans Think About Federal Tax Options to Support Public Transit Highways and Local Streets and Roads Results From Year Eight of a National Survey Research Brief
    What Do Americans Think About Federal Tax Options to Support Public Transit, Highways, and Local Streets and Roads? Results From Year Eight of a National Survey: [Research Brief]
    Nixon, Hilary ;
    Agrawal, Asha Weinstein
    2017-06-01 | What Do Americans Think About Federal Tax Options to Support Transportation? | PDF
    This research brief summarizes the results of the eighth year of an annual survey project exploring national support for raising federal transportation revenues through gas, mileage, and sales taxes. The surveys in the last six years also added a focus on understanding support for public transit.
  • Development and Seismic Evaluation of Pier Systems wPocket Connections CFRP Tendons and ECCUHPC Columns
    Development and Seismic Evaluation of Pier Systems w/Pocket Connections, CFRP Tendons, and ECC/UHPC Columns
    Mohebbi, Alireza ;
    Saiidi, M Saiid
    2017-06-01 | PDF
    Deployment of accelerated bridge construction (ABC) technology has been gaining momentum in recent years. ABC offers many advantages over conventional bridge construction by expediting onsite construction while shortening traffic delays and road closures, thus better serving the traveling public. The use of prefabricated reinforced concrete members ...
  • Synthesis of concrete bridge piles prestressed with CFRP systems
    Synthesis of concrete bridge piles prestressed with CFRP systems.
    Belarbi, Abdeldjelil ;
    Dawood, Mina
    2017-06-01 | PDF
    The Texas Department of Transportation frequently constructs prestressed concrete piles for use in bridgefoundations. Such prestressed concrete piles are typically built with steel strands that are highly susceptible toenvironmental degradation and corrosion in harsh marine environments. The department currently employs manytechniques to combat the ...
  • Traffic impacts of bicycle facilities final report
    Traffic impacts of bicycle facilities : final report.
    Lindsey, Greg ;
    Hourdos, John
    2017-06-01 | PDF
    Engineers need information about interactions between vehicles and bicyclists to design efficient, safe transportation systems. This study involved a review of design guidelines for bicycle facilities, observation of bicycle-vehicle interactions at nine roadways with different types of bicycle facilities, analysis of results, and description of des ...
  • Route 139 rehabilitation Pulaski Skyway contract 2 final report
    Route 139 rehabilitation : Pulaski Skyway contract 2 : final report.
    Nassif, Hani ;
    Wassef, Andrew
    2017-06-01 | PDF
    After being outside and exposed to the elements during many years of service, concrete and thereinforcement within begins to deteriorate and corrode, which affects the performance of concretebridge balustrades, especially those built in the 1930’s and 1940’s. Many of these old concretebalustrades are approaching the end of their design service live ...
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