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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 6941 - 6960 of 36104 results
  • Evaluation of Tack Coat Bond Strength Tests
    Evaluation of Tack Coat Bond Strength Tests
    Shuler, Scott
    2018-05-01 | PDF
    Poor bonding between asphalt pavement overlays and the substrate pavement layer can greatly influence the long term performance of hot mix asphalt (HMA) in the form of premature cracking and fatigue. The primary method to achieve bonding between layers is by using an asphalt emulsion tack coat. Additionally, field staff is charged with determining ...
  • Successes in Stewardship Back to the Basics Environmental Compliance During Emergencies
    Successes in Stewardship - Back to the Basics: Environmental Compliance During Emergencies
    United States. Federal Highway Administration
    2018-05-01 | PDF
    Successes in Stewardship is a Federal Highway Administration (FHWA) bimonthly newsletter highlighting current best practices in stewardship and environmental review from around the country.
  • Estimating External Travel Using Purchased Thirdparty Data
    Estimating External Travel Using Purchased Third-party Data
    Miller, Harvey J. ;
    O'Kelly, Morton E.
    2018-05-01 | PDF
    Archived travel data (ATD) derived from various private sources has attractive characteristics that suggest it can be a suitable replacement for traditional sample-based external travel studies or other similar origin-destination (OD) studies. The hope is that this new source of information will reduce or eliminate several negative characteristics ...
  • Calibration Accuracy of Material Application Equipment
    Calibration Accuracy of Material Application Equipment
    CTC & Associates LLC
    2018-05-01 | PDF
    Accurate calibration of material application equipment is the primary means through which a transportation agency can avoid overapplication of salt and other winter maintenance materials to counter snow and ice on roadways. Methods of effective calibration for salt spreaders have been examined extensively and presented in many published reports and ...
  • Design of Artificially Cracked Concrete Specimens for Virginia Department of Transportation Material Evaluation
    Design of Artificially Cracked Concrete Specimens for Virginia Department of Transportation Material Evaluation
    Torkornoo, Selase ;
    Bradshaw, Ethan
    2018-05-01 | PDF
    The penetration of chloride ions and moisture through cracks in reinforced concrete structures can accelerate the corrosion of steel reinforcement and shorten the service life of the structure. The purpose of this study was to develop a method for simulating cracks of varying widths in concrete as a means of assessing various methods that are used ...
  • Instrumentation to Aid in Steel Bridge Fabrication Bridge Virtual Assembly System
    Instrumentation to Aid in Steel Bridge Fabrication : Bridge Virtual Assembly System
    Fuchs, Paul A ;
    Chase, Steven B.
    2018-05-01 | PDF
    This pool funded project developed a BRIDGE VIRTUAL ASSEMBLY SYSTEM (BRIDGE VAS) that improves manufacturing processes and enhances quality control for steel bridge fabrication. The system replaces conventional match-drilling with virtual assembly methods, creating custom-designed splice plates. Vastly improved measurement and documentation of fabr ...
  • Input Data Development for Motor Vehicle Emissions Simulator MOVES
    Input Data Development for Motor Vehicle Emissions Simulator (MOVES)
    Calcagno, James ;
    Fu, J
    2018-05-01 | PDF
    In April 2004, the U.S. Environmental Protection Agency (EPA) released a new regulatory (computer) model for estimating emissions from on-road motor vehicles called the Motor Vehicle Emission Simulator (MOVES). Since the EPA must periodically update their regulatory models, as stipulated by the Clean Air Act, it was in-line to replace the Mobile So ...
  • Modified MicroDeval Procedure for Polishing of Fine Asphalt Mix Aggregates
    Modified Micro-Deval Procedure for Polishing of Fine Asphalt Mix Aggregates
    Eluri, Zina
    2018-05-01 | PDF
    A procedure combining Micro-Deval and 2nd generation Aggregate Imaging Measurement System (AIMS-II) test procedures was developed to characterize aggregate polishing characteristics, and in turn, provide a means for qualifying aggregate sources for friction purposes. This study focused on the minimum number of aggregate particles, aggregate sizes, ...
  • Arizona Quiet Pavement Pilot Program Comprehensive Report
    Arizona Quiet Pavement Pilot Program: Comprehensive Report
    Donavan, Paul ;
    Janello, Carrie
    2018-05-01 | PDF
    The Quiet Pavement Pilot Program (QPPP) was developed in cooperation with the Federal Highway Administration to evaluate the noise benefit of asphalt rubber friction course (ARFC) on urban freeways in the Phoenix, Arizona, area. The research was conducted periodically over 10 years and involved the use of three types of testing methods to assess th ...
  • An Evaluation of Michigans Continuous Count Station CCS Distribution FINAL REPORT
    An Evaluation of Michigan’s Continuous Count Station (CCS) Distribution : FINAL REPORT
    Oh, Jun-Seok ;
    Kwigizile, Valerian
    2018-04-30 | PDF
    This report evaluated Michigan’s current continuous counting program and proposed a program combining traffic data from Intelligent Transportation Systems (ITS) sites and continuous counting stations (CCS) sites. A web-based survey was conducted to understand other states’ experience in maintaining their statewide traffic monitoring program. Inform ...
  • Battery Technologies for Mass Deployment of Electric Vehicles
    Battery Technologies for Mass Deployment of Electric Vehicles
    Brooker, Paul ;
    Qin, Nan
    2018-04-27 | PDF
    Electric vehicle (EV) batteries have significantly improved since their inception. However, lifetime of these batteries is still strongly dependent on the usage profiles. This report describes aspects of EV battery utilization, and their impact on battery lifetime. Additionally, this report will describe potential future uses of EV batteries, parti ...
  • Transportation Life Cycle Assessment LCA Synthesis Phase II
    Transportation Life Cycle Assessment (LCA) Synthesis, Phase II
    Haselbach, Liv M. ;
    Temizel-Sekeryan, Sila
    2018-04-24 | PDF
    The Transportation Life Cycle Assessment (LCA) Synthesis includes an LCA Learning Module Series, case studies, and analytics on the use of the modules. The module series is a set of narrated slideshows on topics related to environmental LCA. Phase I produced 27 modules, and Phase II added 10 more. The modules are available for download on the Lamar ...
  • Operational Evaluation of Do Not Block the Box Campaigns in Georgia
    Operational Evaluation of Do Not Block the Box Campaigns in Georgia
    Guin, Angshuman ;
    Hunter, Michael
    2018-04-23 | PDF
    The overarching objective of this research is to provide the Georgia Department of Transportation (GDOT) and the Perimeter Community Improvement District (PCID) with an evaluation of the operational performance impacts of implementing a “Do Not Block the Box” (DBTB) campaign at selected signalized intersections. For the studied sites, the likelihoo ...
  • RichmondSan Rafael Bridge Access Improvements Project Before Study Evaluation and Report
    Richmond-San Rafael Bridge Access Improvements Project Before Study Evaluation and Report
    Seeherman, Joshua ;
    Dion, Francois
    2018-04-20 | PDF
    This report examines the existing conditions around the Richmond San-Rafael Bridge, both quantitatively through data collection and qualitatively through stakeholder interviews. This is the first part of a study effort aiming to evaluate the impacts of the proposed pilot modifications on bridge operations. Planned future work will continue to monit ...
  • TR682 Short Span Prefabricated County Bridge Standards
    TR-682: Short Span Prefabricated County Bridge Standards
    HDR, Inc.
    2018-04-19 | PDF
    As part of a project with the Iowa Department of Transportation to develop a set of standards for single­ span prefabricated bridges in the 30' - 70' span range for use by Iowa counties, HDR provided recommendations for a preferred system utilizing precast concrete voided concrete slab beams for the shorter span ranges and precast/prestressed concr ...
  • Incorporating Probe Vehicle Data to Analyze Evacuation Route Resiliency
    Incorporating Probe Vehicle Data to Analyze Evacuation Route Resiliency
    Brennan, Jr. Thomas M.
    2018-04-18 | PDF
    Anonymous probe vehicle data has become an important data source to evaluate the performance of highways and arterials roadway systems. By using predefined spatially located segments, Traffic Message Channels (TMCs) and XD Segments, temporal probe vehicle speed data that includes timestamp and an average speed can be collected and analyzed for each ...
  • Optimal Planning of Rail Grinding Activities in Largescale Networks
    Optimal Planning of Rail Grinding Activities in Large-scale Networks
    Lei, Chao ;
    Ouyang, Yanfeng
    2018-04-17 | PDF
    Among all the causes of train accidents in the United States, track defects are one of the leading reasons. Basically, the natural processes of wear and fatigue of rail steel can proceed at a rapid pace that results in track defects and short service lives. Therefore, maintenance of rails (such as grinding, ballast cleaning, ditching) is very impor ...
  • Development of a Specification for Porous Asphalt Pavements
    Development of a Specification for Porous Asphalt Pavements
    Zinke, Scott ;
    Mahoney, James
    2018-04-16 | PDF
    Porous Pavement Structures (PPS) have many benefits, including reduced or eliminated runoff, filtering of runoff and regeneration of groundwater. These structures have been used successfully across the United States for several years. In addition to adequately draining stormwater, there are a number of criteria these structures need to meet. These ...
  • Interpreting Falling Weight Deflectometer FWD Data for Asphalt and Concrete Pavements
    Interpreting Falling Weight Deflectometer (FWD) Data (for Asphalt and Concrete Pavements)
    Alland, Kevin ;
    Bech, Nathan
    2018-04-16 | PDF
    Falling weight deflectometer (FWD) testing is a valuable method for assessing the structural condition of existing pavement structures. For jointed plain concrete pavements (JPCPs), FWD testing is used to detect voids, monitor joints and crack performance, and backcalculate the modulus of elasticity of the existing Portland cement concrete (PCC) an ...
  • Sign Life Expectancy
    Sign Life Expectancy
    Huynh, Nathan ;
    Mullen, Robert
    2018-04-12 | PDF
    This project investigated the degradation of traffic signs in South Carolina. Data from 1,600 SCDOT-maintained signs, collected over a nine-month period, were analyzed. The signs were selected to provide a representative sample in terms of geographic location and age. In addition to measuring the retroreflectivity of each sign, other sign data coll ...
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