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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 29221 - 29240 of 35452 results
  • Capabilities of LEWICE 16 and Comparison With Experimental Data
    Capabilities of LEWICE 1.6 and Comparison With Experimental Data
    Wright, William B.
    1996-01-01 | PDF
    A research project is underway at NASA Lewis to produce a computer code which can accurately predict ice growth under any meteorological conditions for any aircraft surface. The most recent release of this code is LEWICE 1.6. This paper will demonstrate some of the newer capabilities of this code as well as describe each of these advancements in fu ...
  • Computational Simulation of Large Droplet Icing
    Computational Simulation of Large Droplet Icing
    Wright, William B. ;
    Potapczuk, Mark G.
    1996-01-01 | PDF
    Certification for flight into known icing remains one of the more challenging goals for aircraft manufacturers. This activity has been further complicated by the current interest in large droplet icing. Due to the lack of data available on the meteorology of this phenomena, there is currently an incomplete picture of the nature of the condition and ...
  • Evaluation of the ITS planning process
    Evaluation of the ITS planning process.
    Smith, Brian L.,
    1996-01-01 | PDF
    Planning for the deployment of ITS in regions throughout the United States has been underway since the development of the Early Deployment Program by the Federal Highway Administration (FHWA) in 1992. In 1993, the FHWA released Version 1.0 of the 1TS Planning Process, a systems planning process provided as a guide to those undertaking regional ITS ...
  • Review and evaluation of methods for analyzing capacity at signalized intersections
    Review and evaluation of methods for analyzing capacity at signalized intersections.
    Arnold, E. D ;
    McGhee, C. C
    1996-01-01 | PDF
    VDOT's current policy is to use and accept from others the 1994 Highway Capacity Manual (HCM) as the basis for capacity analysis on Virginia's streets and highways. VDOT uses the latest version of the Highway Capacity Software (HCS). Software programs replicating the 1994 HCM may be used by others submitting work to VDOT for review; however, all in ...
  • Historic bridges bridging the gap between safety concerns and historic preservation
    Historic bridges : bridging the gap between safety concerns and historic preservation.
    Eilers, Jennifer C ;
    Vedder, Andrew T
    1996-01-01 | PDF
    Historic preservation legislation and grassroots efforts promoting preservation have grown over the years both in scope and in the amount of resources pledged to the cause. Among the beneficiaries of these endeavors are historic bridges, which once lingered in the shadow of buildings and historic districts as protected properties. The push to prese ...
  • Field study of an integral backwall bridge final report
    Field study of an integral backwall bridge : final report.
    Hoppe, Edward J ;
    Gomez, Jose´ P
    1996-01-01 | PDF
    Integral bridges offer reduced maintenance expenditures, primarily due to the elimination of deck expansion joints. The design of an integral bridge, however, is complicated by the soil-structure interaction associated with thermal movements. It has been widely recognized that more data on the actual stresses and their distribution within the struc ...
  • Case studies in collecting highway inventory data with the Global Positioning System
    Case studies in collecting highway inventory data with the Global Positioning System.
    Brich, Stephen C
    1996-01-01 | PDF
    A number of state departments of transportation, including the Virginia Department of Transportation (VDOT), are developing a geographic information system (GIS) to integrate data and to conduct more elaborate analyses which will improve their decision-making capabilities. Research is currently being conducted at the Virginia Transportation Researc ...
  • A review and update of the Virginia Department of Transportation cash flow forecasting model
    A review and update of the Virginia Department of Transportation cash flow forecasting model.
    Gillespie, James S. ;
    Kyte, Cheryl A
    1996-01-01 | PDF
    This report details the research done to review and update components of the VDOT cash flow forecasting model. Specifically, the study updated the monthly factors submodel used to predict payments on construction contracts. For the other submodel reviewed in this study, the research culminated in the formulation of a new forecasting technique for m ...
  • Alternate methods of asphalt content determination
    Alternate methods of asphalt content determination.
    Prowell, Brian D
    1996-01-01 | PDF
    This study identified an alternate method of asphalt content determination to replace chlorinated solvent extraction. The production of trichloroethane was outlawed on December 31, 1996 as part of the 1990 Clean Air Act Amendments. Initially, the study focused on evaluating the nuclear asphalt content gauge with Marshall plugs. During the course of ...
  • Safety belt and motorcycle helmet use in Virginia the 1996 update
    Safety belt and motorcycle helmet use in Virginia : the 1996 update.
    Stoke, Charles B
    1996-01-01 | PDF
    This series of surveys to determine the safety belt and motorcycle helmet use rates in Virginia was initiated to qualify the Commonwealth for incentive funds in accordance with the requirements of the Intermodal Surface Transportation Efficiency Act, Section 153. To receive the funds, states had to meet specified standards with regard to the existe ...
  • Evaluation of a thinbonded Portland cement concrete pavement overlay
    Evaluation of a thin-bonded Portland cement concrete pavement overlay.
    Freeman, Thomas E
    1996-01-01 | PDF
    This report discusses the performance of the Virginia Department of Transportation's first modern rehabilitation project involving a thin-bonded portland cement concrete overlay of an existing jointed concrete pavement. The performance of the rigid overlay, which was constructed in a fast-track mode to minimize lane closure time, was evaluated by d ...
  • Prescribing a bridge deck ride quality repair using the South Dakota road profiler and the Dipstick technical assistance report
    Prescribing a bridge deck ride quality repair using the South Dakota road profiler and the Dipstick : technical assistance report.
    McGhee, Kevin K
    1996-01-01 | PDF
    This report describes how two sophisticated road roughness instruments were used to investigate the feasibility of a bridge deck ride quality repair. The instruments were the South Dakota Road Profiler (SDRP) and the Face Companies' Dipstick®. The bridge being repaired was on Interstate 95 over the Occoquan River in Northern Virginia. The repair be ...
  • The economics of the introduction of modern timber bridges in Virginia
    The economics of the introduction of modern timber bridges in Virginia.
    Gomez, Jose´ P ;
    McKeel, Wallace T
    1996-01-01 | PDF
    In 1990, the Virginia Assembly established a commission to propose recommendations to enhance the economic development of the southside region of the Commonwealth. The commission's 1991 report, House Document 42, included a recommendation for a timber bridge initiative to replace Virginia's structurally deficient bridges. The commission noted that ...
  • Application of electromagneticacoustic transducers for nondestructive testing in steel bridge structures
    Application of electromagnetic-acoustic transducers for nondestructive testing in steel bridge structures.
    Lozev, Margarit G ;
    Clark, Alfred V
    1996-01-01 | PDF
    This report presents the results of a study to (1) assess the applicability of electromagnetic-acoustic transducers for nondestructive evaluation of stresses in bridge structures and (2) evaluate the new ultrasonic instruments as an effective technique for stress surveys in bridge structures. Field tests were performed on two bridges, one a simply ...
  • Traffic and highway geometric characteristics associated with pedestrian crashes in Virginia
    Traffic and highway geometric characteristics associated with pedestrian crashes in Virginia.
    Garber, Nicholas J ;
    Lienau, Torsten
    1996-01-01 | PDF
    Although motor vehicle traffic volume continues to increase, recent studies have shown that in most cities about 90 percent of all internal trips within the central business district are walking trips. Additionally, those rural areas experiencing high growth rates are also comending with increases in pedestrian traffic. As pedestrian traffic grows, ...
  • Assessment of Virginias hybrid South Dakota road profiling system
    Assessment of Virginia's hybrid South Dakota road profiling system.
    McGhee, Kevin K
    1996-01-01 | PDF
    South Dakota Road Profiling (SDRP) systems have been widely sanctioned for use in assessing road roughness and rutting at highway speeds. Traditionally, these high-speed profiling systems have been built around ultrasonic height sensors. More recently, some designs have begun to substitute laser sensors to combat many of the limitations of sound-ba ...
  • Pilot Applications of Electrochemical Chloride Extraction on Concrete Piers in Virginia
    Pilot Applications of Electrochemical Chloride Extraction on Concrete Piers in Virginia
    Jackson, Donald R ;
    Clemeña, Gerardo G.
    1996-01-01 | PDF
    Applying a temporary electric field between the concrete surface and the rebars can expel or remove chloride ions from salt-contaminated reinforced concrete, which will mitigate rebar corrosion. A new method for the permanent rehabilitation of concrete bridges, based on the technique of electrochemical chloride extraction (ECE), was applied to thre ...
  • The influence of fines on strength and drainage characteristics of aggregate bases
    The influence of fines on strength and drainage characteristics of aggregate bases.
    Hoppe, Edward J
    1996-01-01 | PDF
    One of the most commonly used dense-graded aggregate mixes in Virginia is designated as Type 2lB. In an effort to improve drainage characteristics of the 21B material it was proposed to decrease the maximum allowable percentage of fines from 7% to 5% while retaining the existing percentage ranges for course particles. Prior to implementing this mod ...
  • Evaluation of pavement markings for improved visibility during wet night conditions
    Evaluation of pavement markings for improved visibility during wet night conditions.
    Cottrell, Benjamin H
    1996-01-01 | PDF
    This study evaluated the night visibility of waffle tape and paint with large beads, particularly during wet night conditions. Data were collected at two sites along a primary arterial. The evaluation included an examination of (1) the application of the markings, (2) the visibility of the markings using retroreflectometer measurements and subjecti ...
  • Effectiveness of transportation control measures overview of the state of the practice
    Effectiveness of transportation control measures : overview of the state of the practice.
    Arnold, E. D
    1996-01-01 | PDF
    Transportation control measures, or TCMs, are transportation measures or strategies intended both to reduce vehicle miles of travel (VMT) and to make those traveled more efficient. Although the term TCM has its origins in air quality and emissions reductions, TCMs encompass many of the elements or strategies in transportation systems management (TS ...
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