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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 6521 - 6540 of 36101 results
  • Evaluation of Traffic Signal Communication
    Evaluation of Traffic Signal Communication
    Wu, Yao-Jan ;
    Kluger, Robert
    2018-09-01 | PDF
    Management of signal system technology on arterial corridors produces challenges for state and local departments of transportation (DOTs). The purpose of this project was to evaluate technology deployments on three arterial study corridors in Arizona. The corridors were evaluated based on criteria relating to such aspects as operations, maintenance ...
  • Tracer Study to Estimate the Transport of Cruise Altitude Aviation Emissions in Northern Hemisphere
    Tracer Study to Estimate the Transport of Cruise Altitude Aviation Emissions in Northern Hemisphere
    Vennam, LP ;
    Vizuete, W
    2018-09-01 | PDF
    Given the increasing role of intercontinental and higher altitude emissions influence on surface air quality, it is important to understand the transport characteristics of these emissions both for policy and mitigation strategies. The horizontal and vertical transport of directly emitted upper troposphere anthropogenic cruise altitude aircraft emi ...
  • Investigation of HighRange Water Reducers on Inducing MicroCracking in Precast Concrete Elements
    Investigation of High-Range Water Reducers on Inducing Micro-Cracking in Precast Concrete Elements
    Ferron, Raissa ;
    Carris, Gwen
    2018-09-01 | PDF
    An overarching objective of this project is to increase the understanding of the effect of polycarboxylate (PC) high-range water-reducers (HRWR) on the performance of concrete mixtures, with a special focus on concrete mixtures that will be used in precast concrete beam applications. The motivation for this research was based upon the results of In ...
  • Monitoring and Control of Overweight Trucks for Smart Mobility and Safety of Freight Operations
    Monitoring and Control of Overweight Trucks for Smart Mobility and Safety of Freight Operations
    Nassif, Hani ;
    Ozbay, Kaan
    2018-09-01 | PDF
    The main objectives of this project are to (1) develop the methodology to estimate the infrastructure damage cost associated with overweight vehicles on the road infrastructure in New York City (NYC) especially for pavements and bridges; (2) develop a web-based application to calculate the network-based damage cost to assess their impact; and (3) s ...
  • Sustainable Transportation Implications of OnDemand Ride Services
    Sustainable Transportation Implications of On-Demand Ride Services
    Pike, Susan ;
    Krantz, Kelila
    2018-09-01 | PDF
    The purpose of the research presented here is to assess the need and support for potential local and statewide actions that might improve sustainability and mobility outcomes related to on-demand ridehailing services. This study analyzes stakeholder preferences for policy-making within different venues, and involving different interests. The past p ...
  • Development of Fit Envelopes to Promote Compatibility Among Vehicles and Child
    Development of Fit Envelopes to Promote Compatibility Among Vehicles and Child
    Klinich, Kathleen D. ;
    Boyle, Kyle J.
    2018-09-01 | PDF
    This project developed fit envelopes representing the space occupied by small, medium, and large rear-facing and forward-facing child restraints that can be used as tools for promoting compatibility between vehicles and child restraints. The approach applies the envelope method used by the International Standards Organization (ISO) to the U.S. mark ...
  • Crack Resistance and Durability of RAS Asphalt MixturesPhase I
    Crack Resistance and Durability of RAS Asphalt Mixtures-Phase I
    Rodezno, Carolina ;
    Taylor, Adam
    2018-09-01 | PDF
    This research evaluated several asphalt mixture tests to determine which test(s) have the most potential to assess a mixture’s susceptibility to cracking. To accomplish this, an experimental plan was conducted that included eight unique mixes using raw materials from existing Ohio field projects. These mixes have different percentages of recycled m ...
  • Analysis of Curb Inlets in the New TxDOT Standard Inlet and Manhole Program Project Summary
    Analysis of Curb Inlets in the New TxDOT Standard Inlet and Manhole Program [Project Summary]
    Hodges, Ben R ;
    Barrett, Michael
    2018-09-01 | PDF
    Curb inlets are installed to reduce water spread across a road. For efficient modular construction, TxDOT has provided a new standard for precast curb inlets outside roadway (referred to as PCO). Several questions arose within TxDOT about the hydraulic performance of PCO inlets because of the use of ??lush supports and restrictions in side bays. St ...
  • Seismic Behavior of Steel Bridges with FatigueProne Details
    Seismic Behavior of Steel Bridges with Fatigue-Prone Details
    Mahmoud, Hussam ;
    Irfaee, Mazin
    2018-09-01 | PDF
    Steel bridges with reinforced concrete substructures and steel superstructures are considered to have superior performance under earthquakes when compared with their reinforced concrete counterpart. Such performance reputation stems from the fact that few steel bridges have been subjected to strong ground motion in the last decade in North America. ...
  • 2018 Safety Belt Usage Survey in Kentucky
    2018 Safety Belt Usage Survey in Kentucky
    Lammers, Erin ;
    Agent, Kenneth R.
    2018-09-01 | PDF
    The objective of the survey summarized in this report was to establish a statewide safety belt usage rate in Kentucky for 2018. This rate can be compared to those determined from previous surveys. The 2018 statewide survey documents the continued increase in usage associated with the change in the law to allow primary enforcement and related educat ...
  • SPLIQ Users Manual Version 141
    SPLIQ User’s Manual Version 1.41
    Franke, Kevin W ;
    Astorga, Lucy
    2018-09-01 | PDF
    This user’s manual includes a step-by-step process for using a spreadsheet tool called SPLIQ to perform simplified calculations for performance-based probabilistic earthquake hazard analysis while using Standard Penetration Test (SPT) data from site soil borings. The simplified models provide estimates of liquefaction triggering, lateral spread dis ...
  • Regressing Air Voids for Balanced HMA Mix Design Final Report
    Regressing Air Voids for Balanced HMA Mix Design [Final Report]
    West, Randy C. ;
    Rodezno, Carolina
    2018-09-01 | PDF
    This project evaluated the impact of the air voids regression approach on cracking, rutting, and moisture damage resistance of asphalt mixtures. The experimental plan included a total six mixes designed for low, medium, and high traffic levels, with various contents of RAP and RAS. Mixture performance tests included the Illinois Flexibility Index T ...
  • Development of a TravelTime Reliability Measurement System
    Development of a Travel-Time Reliability Measurement System
    Kwon, Eil ;
    Park, Chongmyung
    2018-09-01 | PDF
    This study has developed a computerized Travel-Time Reliability Measurement System (TTRMS), which can automate the time-consuming process of gathering and managing data from multiple sources and calculating various types of reliability measures under user-specified conditions for given corridors. The TTRMS adopts a server and client structure, wher ...
  • Economic Impact of Bicycling in Texas
    Economic Impact of Bicycling in Texas
    Texas A & M Transportation Institute
    2018-09-01 | PDF
    Bicycling is an economic driver that can generate billions of dollars in retail spending and support millions of jobs nationwide each year (1). The economic impact of bicycling is a widely studied topic of interest to several state transportation agencies. More than ten states have conducted studies on the economic impact of bicycling in their stat ...
  • Compliance and Surrogate Safety Measures for Uncontrolled Crosswalk Crossings in Oregon
    Compliance and Surrogate Safety Measures for Uncontrolled Crosswalk Crossings in Oregon
    Figliozzi, Miguel A. ;
    Unnikrishnan, Avinash
    2018-09-01 | PDF
    This research aims to find readily observable and measurable field measures and geometric data to evaluate relative crosswalk safety performance. A literature review was conducted and crash data analysis was undertaken to determine the significant predictors for pedestrian crashes at unsignalized marked crosswalks. These factors were used to select ...
  • Impacts of Traffic Signal Controls on a Distributed Traffic Monitoring System Using V2V Communications
    Impacts of Traffic Signal Controls on a Distributed Traffic Monitoring System Using V2V Communications
    Lou, Yingyan ;
    Li, Peiheng
    2018-09-01 | PDF
    Our previous work has developed a distributed framework for network-wide traffic monitoring 4 and platoon information aggregation using vehicle-to-vehicle communications alone, which is the foundation of an envisioned virtual traffic operations system that could supplement existing operation systems or serve as an alternative in extreme situations. ...
  • Louisianas AlcoholImpaired Driving Problem An Analysis of Crash and Cultural Factors Research Project Capsule 182SA
    Louisiana’s Alcohol-Impaired Driving Problem: An Analysis of Crash and Cultural Factors: Research Project Capsule 18-2SA
    Shipp, Eva
    ORCID ICON IMG
    2018-09-01 | PDF
    Alcohol-impaired driving fatalities have decreased over the past several years, but these tragic events continue to be a major problem. Despite the reduction, alcohol-impaired driving still accounts for more than 30% of all vehicle fatalities in Louisiana. Associating impaired driving with social and cultural factors must be considered. Behavior re ...
  • Evaluation of Adaptive Ramp Metering on I80 in the San Francisco Bay Area
    Evaluation of Adaptive Ramp Metering on I-80 in the San Francisco Bay Area
    Pande, Anurag
    ORCID ICON IMG
    2018-09-01 | PDF
    Adaptive ramp metering (ARM) is a critical component of smart freeway corridors under an active traffic management portfolio. While improving capacity through smart corridors and application of proactive traffic management solutions is less costly and easier to deploy than freeway widening, conversion to smart corridors still represents a sizable i ...
  • Evaluating the Use of Nanomaterials to Enhance Properties of Asphalt Binders and Mixtures
    Evaluating the Use of Nanomaterials to Enhance Properties of Asphalt Binders and Mixtures
    Filonzi, Angelo ;
    Sabaraya, Indu Venu
    2018-09-01 | PDF
    Traditional polymer modified binders are typically used to achieve a target performance grade (PG) and also to enhance resistance of the binder to distresses such as rutting, fatigue cracking, and low- temperature cracking. Conventional modifiers used with asphalt binders are often expensive and are not very effective to improve the low-temperature ...
  • Evaluating the Performance of Intermodal Connectors in Arkansas
    Evaluating the Performance of Intermodal Connectors in Arkansas
    Hernandez, Sarah ;
    Asborno, Magdalena
    2018-09-01 | PDF
    The purpose of this project is to evaluate the performance and usage of Intermodal Connectors (ICs) in Arkansas using data-driven methods. ICs serve as the critical ‘first and last mile’ segments of the National Highway System (NHS) by connecting airports, marine and river ports, and intermodal facilities to the NHS. ICs play a critical role in the ...
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