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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 30721 - 30740 of 35412 results
  • An evaluation of congestionreducing measures used in Virginia
    An evaluation of congestion-reducing measures used in Virginia.
    Arnold, E. D
    1992-01-01 | PDF
    Congestion on our nation's highways, especially in urban areas, is a serious problem that is growing steadily worse. In Virginia, it is estimated that 28 percent of the daily vehicle miles of travel (VMT) occurring during peak hour traffic is congested (volume/service flow ratio> 0.75). Further, it is estimated that the cost of urban area congestio ...
  • Alternative acceptance procedures for asphalt mixes
    Alternative acceptance procedures for asphalt mixes.
    Hughes, Charles S
    1992-01-01 | PDF
    By the year 2005, the use of chlorinated solvents is to be eliminated. Faced with this eventuality, VDOT formed a task force to look at alternatives for the acceptance of asphalt mixes. One alternative is to use biodegradable solvents in the extraction tests. Although this alternative is being examined, there are some disadvantages to using these s ...
  • Field performance of a porous asphaltic pavement
    Field performance of a porous asphaltic pavement.
    Wyant, David C
    1992-01-01 | PDF
    The Virginia Department of Transportation constructed a 2.52-acre parking lot of porous asphaltic pavement in Warrenton, Virginia. Runoff from the lot was collected and monitored for quantity, detention time, and quality. Prior to the lot opening for public use, three storms were successfully monitored. After the lot was opened to the public, four ...
  • Evaluation of the International Barrier Corporations Mark VII median barrier
    Evaluation of the International Barrier Corporation's Mark VII median barrier.
    Cottrell, Benjamin H
    1992-01-01 | PDF
    The International Barrier Corporation's (IBC) Mark VII median barrier consists of a steel frame (10 ft long, 42 in high, and 44 in wide at its widest point) filled with sand and covered with a top plate. The barrier has the ability to absorb some of the impact energy of a collision, which should reduce the severity of the impact. An experimental se ...
  • Legislative approaches to increasing Virginias conviction rate for drugrelated DUI
    Legislative approaches to increasing Virginia's conviction rate for drug-related DUI.
    Lau, Robyne R ;
    Black, Jonathan C
    1992-01-01 | PDF
    Beginning on April 1, 1988, a revision of Virginia's law concerning drug-related driving under the influence (DUI) enabled police officers to require a person suspected of driving under the influence of drugs to submit a blood sample to be tested for drug content. However, some judges have been reluctant to pass down a DUI conviction in the absence ...
  • Virginias program to combat drugrelated DUI 19881989
    Virginia's program to combat drug-related DUI, 1988-1989.
    Jernigan, Jack D
    1992-01-01 | PDF
    Beginning on April 1, 1988, a revision to Virginia law gave police officers the authority to require an individual suspected of driving under the influence (DUI) of drugs to submit a blood sample to be tested for drug content. Concurrent with the implementation of the revised law, Virginia initiated a pilot Drug Recognition Technician (DRT) Program ...
  • Effect of calcium nitrite on the properties of concrete used in prestressed piles and beams
    Effect of calcium nitrite on the properties of concrete used in prestressed piles and beams.
    Ozyildirim, H. Celik
    1992-01-01 | PDF
    This study evaluates the concretes in steam-cured prestressed piles and beams containing calcium nitrite as protection against chloride-induced corrosion of the steel strands and assesses their field performance over a 3-year period. Concretes containing slag were also included in the study to evaluate their permeability to chloride ions. It was fo ...
  • Effect of calcium nitrite on the properties of concrete used in bridge decks
    Effect of calcium nitrite on the properties of concrete used in bridge decks.
    Ozyildirim, H. Celik
    1992-01-01 | PDF
    Chloride-induced corrosion of the reinforcing steel in bridge decks can impair its structural integrity and cause spalling, which reduces the ride quality of the deck. One system to prevent corrosion involves the use of corrosion inhibitors in freshly mixed concrete. This study evaluates the properties of field concretes containing the inhibitor, D ...
  • Potential revenue sources for Virginias transportation safety programs review of Virginias revenue sources and a survey of other states final report
    Potential revenue sources for Virginia's transportation safety programs : review of Virginia's revenue sources and a survey of other states : final report.
    Froning, Patricia
    1992-01-01 | PDF
    Fearful that inflation and the gradual erosion of federal support for highway safety programs were undermining Virginia's historic position of national leadership in highway safety; management directed a study of potential sources of new revenue for the programs. The project reported here employed a five-step process to gather data necessary for th ...
  • Design and construction of a bonded fiber concrete overlay of CRCP final report
    Design and construction of a bonded fiber concrete overlay of CRCP : final report.
    King, William M.
    1992-01-01 | PDF
    The purpose of this study was to evaluate a bonded steel fiber reinforced concrete overlay on an existing 8-inch CRC pavement on Interstate 10 south of Baton Rough, LA. The project objectives were to provide an overlay with a high probability for long term success by using a concrete mix high cement content, internal reinforcement, and with good bo ...
  • Evaluation of a KeyStoneTensar geogrid retaining wall system final report
    Evaluation of a KeyStone/Tensar geogrid retaining wall system : final report.
    Kliewer, Julia E. ;
    Yates, Steve
    1992-01-01 | PDF
    The KeyStone/Tensar Geogrid retaining wall system is an alternative to conventional reinforced concrete retaining wall structures. KeyStone concrete wall units, Tensar geogrid, and compacted soils are combined to form a reinforced soil mass that together act as a gravity wall structure to resist lateral earth pressures and surcharge loads.The objec ...
  • Evaluation of the Baladi indirect tensile test apparatus final report
    Evaluation of the Baladi indirect tensile test apparatus : final report.
    Larson, Wilbur D. ;
    George, Anthony J.
    1992-01-01 | PDF
    No Description
  • Capital beltway photoradar demonstration project site visit report
    Capital beltway photo-radar demonstration project : site visit report.
    Lynn, Cheryl
    1992-01-01 | PDF
    No Description
  • Automated speed enforcement pilot project for the Capital Beltway feasibility of photoradar
    Automated speed enforcement pilot project for the Capital Beltway : feasibility of photo-radar.
    Lynn, Cheryl ;
    Garber, NJ
    1992-01-01 | PDF
    Because of increasing difficulties in enforcing posted speed limits on the Capital Beltway around Washington, D.C., local officials proposed that experiments be conducted with photo-radar to determine if that method of automated speed enforcement (widely used in Europe for about 30 years and very recently employed in the western United States) coul ...
  • 1992 Traffic Crash Facts and Statistics Pennsylvania
    1992 Traffic Crash Facts and Statistics [Pennsylvania]
    Pennsylvania. Dept. of Transportation
    1992-01-01 | PDF
    The 1992 TRAFFIC CRASH FACTS AND STATISTICS is a report published by the Center for Highway Safety of the Pennsylvania Department of Transportation. This publication is a statistical review of reportable motor vehicle traffic crashes in the Commonwealth of Pennsylvania for the calendar year 1992. The figures are compiled from the traffic crash repo ...
  • Evaluation of an Alternative Method for Hiring Air Traffic Control Specialists with Prior Military Experience
    Evaluation of an Alternative Method for Hiring Air Traffic Control Specialists with Prior Military Experience
    Manning, Carol A. ;
    Aul, Jay C.
    1992-01-01 | PDF
    This study was conducted to assess an FAA program to hire former military air traffic control specialists to enter ATC field training directly without first attending the Academy screening program. Selection of military controllers was based on meeting prehire qualifications, subject matter expert ratings of ATC training and experience, supervisor ...
  • Effects of Color Vision Deficiency on Detection of ColorHighlighted Targets in a Simulated Air Traffic Control Display
    Effects of Color Vision Deficiency on Detection of Color-Highlighted Targets in a Simulated Air Traffic Control Display
    Mertens, Henry W. ;
    Thackray, Richard I.
    1992-01-01 | PDF
    The present study sought to evaluate the effects of color vision deficiency on the gain in conspicuity that is realized when color-highlighting is added as a redundant cue to indicate the presence of unexpected, nontracked aircraft intruding in controlled airspace. Sixteen subjects with severe color vision deficiency of both protan and deutan types ...
  • Exposures from Headset Interference Tones
    Exposures from Headset Interference Tones
    May, Noal D.
    1992-01-01 | PDF
    This study evaluated the acoustic characteristics of interference tones as experienced by FAA Air Traffic Control Specialists (ATCS's) and pilots who wear headsets with insert type ear pieces. The Sound Pressure Levels (SPL's) of generated tones were measured through the headset at five randomly selected ATCS positions in each of seven Air Route Tr ...
  • Human Factors Evaluation of the Work Environment of Operators Engaged in the Inspection and Repair of Aging Aircraft
    Human Factors Evaluation of the Work Environment of Operators Engaged in the Inspection and Repair of Aging Aircraft
    Thackray, Richard I.
    1992-01-01 | PDF
    Site evaluations of air carriers and repair stations conducting inspections and heavy maintenance on PART 121 aging aircraft were conducted during 1989-90 under the FAA's Office of Flight Standards Aging Fleet Evaluation Program. This report presents the findings of the human factors portion of this program in which aspects of the work environment ...
  • Radiation Exposure of Air Carrier Crewmembers II
    Radiation Exposure of Air Carrier Crewmembers II
    Friedberg, W. ;
    Snyder, L.
    1992-01-01 | PDF
    The cosmic radiation environment at air carrier flight altitudes is described and estimates given of the amounts of galactic cosmic radiation received on a wide variety of routes to and from, and within the contiguous United States. Radiation exposure from radioactive air cargo is also considered. Methods are provided to assess health risks from ex ...
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