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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 6101 - 6120 of 36958 results
  • Dissecting the Safety Benefits of Protected Intersection Design Features
    Dissecting the Safety Benefits of Protected Intersection Design Features
    Christofa, Eleni ;
    Knodler Jr., Michael A.
    2019-06-01 | PDF
    Protected intersections are an integral component of Complete Streets and are used to facilitate safe crossings for bicyclists and pedestrians at intersections. Their placement is ideal after segments with protected bike lanes where drivers might not be aware of bicyclists’ presence. Protected intersections have the ability to increase drivers’ awa ...
  • Disc Shaped Compact Tension DCT Specifications Development for Asphalt Pavement
    Disc Shaped Compact Tension (DCT) Specifications Development for Asphalt Pavement
    Dave, Eshan V. ;
    Oshone, Mirkat
    2019-06-01 | PDF
    The disc-shaped compact tension (DCT) fracture energy test has been shown to discriminate between asphalt mixtures with respect to their thermal cracking potential. This research refines the DCT fracture energy testing procedure, identifies needed adjustments in asphalt mixture to increase fracture energy, determines the suitability of DCT-test-bas ...
  • Energyaware Trajectory Optimization of Connected and Automated Vehicle Platoons through a Signalized Intersection
    Energy-aware Trajectory Optimization of Connected and Automated Vehicle Platoons through a Signalized Intersection
    Han, Xiao ;
    Ma, Rui
    2019-06-01 | PDF
    Traffic signals, while serving an important function to coordinate vehicle movements through intersections, also cause frequent stops and delays, particularly when they are not properly timed. Such stops and delays contribute to significant amount of fuel consumption and greenhouse gas emissions. The recent development of connected and automated ve ...
  • Investigation of Utah Highway SpeedLimit Compliance Rates and Evaluation of SpeedLimit Design in Towns along Highways
    Investigation of Utah Highway Speed-Limit Compliance Rates and Evaluation of Speed-Limit Design in Towns along Highways
    Zhang, Zhao ;
    Yang, Xianfeng (Terry)
    2019-06-01 | PDF
    In Utah, 14,546 speed-related crashes occurred in rural areas from 2010. 47.4% of them were crashes with injuries. 239 crashes resulted in fatalities and, 1,043 crashes resulted in serious injuries. This shows a crucial need for investigating highway speed-limit compliance rates and evaluating current practices on setting up speed zones in towns al ...
  • Prediction of Resilient Modulus From the Laboratory Testing of Sandy Soils
    Prediction of Resilient Modulus From the Laboratory Testing of Sandy Soils
    Kim, S. Sonny ;
    Pahno, Steve
    2019-06-01 | PDF
    As Georgia Department of Transportation (GDOT) is moving toward implementing the Mechanistic–Empirical Pavement Design Guide (MEPDG) and utilizing the AASHTOWare Pavement ME Design software, there is a pressing need to develop a subgrade resilient modulus (MR) database considering Georgia-specific soil conditions in order to achieve a reliable pave ...
  • Flexural Performance of Concrete Beams Strengthened using Different Repair Techniques
    Flexural Performance of Concrete Beams Strengthened using Different Repair Techniques
    Nassif, Hani ;
    Abu-Obeidah, Adi
    2019-06-01 | PDF
    With an aging infrastructure, the United States is faced with a wide variety of deterioration and lack of functionality for its bridges and highways. Economic factors do not always allow for a complete replacement of the structure which highlights the importance of the concrete rehabilitation technologies. Retrofitting existing structures using fib ...
  • Layer Coefficients for New Hampshire Department of Transportation Pavement Design
    Layer Coefficients for New Hampshire Department of Transportation Pavement Design
    Dave, Eshan V. ;
    Sias, Jo E
    2019-06-01 | PDF
    At present, New Hampshire Department of Transportation (NHDOT) has adopted AASHTO empirical pavement design approach. This research focused on updating the layer coefficients (a-value) of the asphalt mixtures using different mechanistic and performance based measures. A set of 18 commonly used mixtures in New Hampshire were selected for performance ...
  • Development and Evaluation of Concrete Barrier Containment Options for Errant Motorcycle Riders
    Development and Evaluation of Concrete Barrier Containment Options for Errant Motorcycle Riders
    Dobrovolny, Chiara Silvestri ;
    Shi, Shengyi
    2019-06-01 | PDF
    Motorcycles are among the most vulnerable vehicles on the road. Although a combination of different factors may contribute to motorcycle crashes, roadside safety systems design can play an important role in limiting the severity of motorcycle crashes. Roadside safety systems are not typically designed with the special needs of motorcyclists in mind ...
  • Temporary Saltwater Pipelines Current Practice and Recommendations
    Temporary Saltwater Pipelines: Current Practice and Recommendations
    Quiroga, Cesar ;
    Holik, William A.
    2019-06-01 | PDF
    Drilling and completing oil and gas wells, particularly when using horizontal and hydraulic fracturing techniques, requires enormous amounts of water. Generally, it is cheaper for the industry to move fluids by pipeline than by truck, hence the interest in using permanent and/or temporary pipelines to transport water in areas where oil and gas deve ...
  • Incorporating Impact of Aging on Cracking Performance of Mixtures During Design
    Incorporating Impact of Aging on Cracking Performance of Mixtures During Design
    Sias, Jo E ;
    Dave, Eshan V.
    2019-06-01 | PDF
    Aging can significantly affect the properties of asphalt binders and mixtures, causing increase in stiffness, reduction in relaxation capability, and increase in brittleness. Eleven mixtures were evaluated in this project using different laboratory conditioning protocols to evaluate how the properties of asphalt binders and mixtures, including rheo ...
  • Assessment of the Effectiveness of WrongWay Driving WWD Detection System
    Assessment of the Effectiveness of Wrong-Way Driving (WWD) Detection System
    Zhang, Zhao ;
    Yang, Xianfeng (Terry)
    2019-06-01 | PDF
    Wrong-way Driving (WWD) presents one of the most serious traffic hazards on the highway system across the United States. According to the data from the National Highway Transportation Safety Administration (NHTSA) Fatality Analysis Reporting System (FARS), hundreds of fatal crashes are caused by WWD drivers yearly. This issue remains unsolved at ma ...
  • Site Characterization and SiteSpecific Seismic Ground Motions Analyses for a Gravelly Site in Wyoming
    Site Characterization and Site-Specific Seismic Ground Motions Analyses for a Gravelly Site in Wyoming
    Griffiths, Shawn C. ;
    Frazier, Josh D
    2019-06-01 | PDF
    Surface wave testing was performed as part of the sub-surface soil investigation for a bridge replacement project to be constructed within the next five years by the Wyoming Department of Transportation (WYDOT), over the Snake River near Jackson Wyoming. This investigation was performed in order to determine the shear wave velocity structure and se ...
  • An Artificial Intelligence Platform for Networkwide Congestion Detection and Prediction Using MultiSource Data
    An Artificial Intelligence Platform for Network-wide Congestion Detection and Prediction Using Multi-Source Data
    Wang, Yinhai ;
    Ban, Xuegang (Jeff)
    2019-06-01 | PDF
    The advancement of new smart traffic sensing, mobile communication, and artificial intelligence technologies has greatly stimulated the growth of transportation data. A great deal of generated transportation data is playing an important role in modern smart transportation and smart city research and applications. The increase of computation power e ...
  • Pedestrian and Bicycle Crash Risk and Equity Implications for Street Improvement Projects
    Pedestrian and Bicycle Crash Risk and Equity: Implications for Street Improvement Projects
    Lindsey, Greg ;
    Tao, Tao
    2019-06-01 | PDF
    Transportation managers need information about crash risk and equity to prioritize investments in street networks. This case study uses data from Minneapolis, Minnesota, to illustrate how estimates of pedestrian and bicycle crash risk and assessments of inequities in the distribution of that risk can inform prioritization of street improvement proj ...
  • Evaluating Streetlight Estimates of Annual Average Daily Traffic in Oregon
    Evaluating Streetlight Estimates of Annual Average Daily Traffic in Oregon
    Roll, Josh
    ORCID ICON IMG
    2019-06-01 | PDF
    This report summarizes the evaluation of Streetlight Data’s Annual Average Daily Traffic (AADT) product by comparing with Oregon Department of Transportation’s automatic traffic recorder data and AADT estimates derived from short term counts in Bend, MPO. Using an evaluation methodology established by Turner et al. (2008), the report concludes that ...
  • Older Drivers and Transportation Network Companies Investigating Opportunities for Increased Safety and Improved Mobility
    Older Drivers and Transportation Network Companies: Investigating Opportunities for Increased Safety and Improved Mobility
    Tooley, Melissa S. ;
    Zmud, Johanna
    2019-06-01 | PDF
    Transportation network companies (TNCs) such as Uber and Lyft offer an increasingly popular alternative to driving a personal vehicle. This project investigated the potential of TNCs to increase the safety and enhance the mobility of older adults who are experiencing a decline in driving ability. Interviews with commercial and non-profit transporta ...
  • Evaluation of the Smart Work Zone Speed Notification System
    Evaluation of the Smart Work Zone Speed Notification System
    Hourdos, John ;
    Parikh, Gordon
    2019-06-01 | PDF
    The Smart Work Zone Speed Notification (SWZSN) system aims to alleviate congestion, queuing, and rear end crashes in work zones by informing drivers of the speed of the downstream segment using a type of portable Intelligent Lane Control System (ILCS), Portable Changeable Message Signs (PCMS). The hypothesis was that drivers, knowing the speed up t ...
  • Guidelines for Installing Operating and Maintaining Temporary Saltwater Pipelines
    Guidelines for Installing, Operating, and Maintaining Temporary Saltwater Pipelines
    Quiroga, Cesar ;
    Holik, William A.
    2019-06-01 | PDF
    This guidebook describes recommended practices for the accommodation, installation, operation, and maintenance of temporary pipelines within the right of way. The recommendations are based on the findings and lessons learned from Texas Department of Transportation (TxDOT) Research Project 0-6886 and focus primarily on above-ground temporary pipelin ...
  • Exploring the Modified Procurement Framework for Expediting Florida Connected Vehicle CV Deployments Research Brief
    Exploring the Modified Procurement Framework for Expediting Florida Connected Vehicle (CV) Deployments [Research Brief]
    Sando, Thobias ;
    Alluri, Priyanka
    2019-06-01 | PDF
    Many states are actively exploring connected vehicle (CV) technologies to improve travel reliability, efficiency, and safety on increasingly crowded roadways. CVs communicate with each other and with roadside infrastructure that relay information to and from traffic management centers. A CV’s awareness of nearby vehicles can greatly reduce the pote ...
  • Cognitive Underpinnings of Beliefs and Confidence in Beliefs about Fully Automated Vehicles
    Cognitive Underpinnings of Beliefs and Confidence in Beliefs about Fully Automated Vehicles
    Sanbonmatsu, David M. ;
    Strayer, David L.
    2019-06-01 | PDF
    A study investigated the cognitive underpinnings of consumers’ beliefs and confidence in their beliefs about fully automated vehicles. Following previous research, opinions about self-driving cars tended to be mixed. The most negative views were held by consumers who had the least knowledge of self-driving cars. Low trust in technology was also ass ...
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