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US Transportation Collection

rosaP Repository & Open Science Access Portal

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 28881 - 28900 of 35553 results
  • Visibility Spacing and Operation of Freeway Lane Control Signals
    Visibility, Spacing, and Operation of Freeway Lane Control Signals
    Ullman, Gerald L. ;
    Parma, Kelly D.
    1996-09-01 | PDF
    This report summarizes the research performed and documented in interim project reports to address visibility, spacing, and operational issues pertaining to lane control signals (LCSs) used for freeway traffic management in Texas. Chapters in this final report review the results of legibility studies of new and used LCSs; a TxDOT expert panel meeti ...
  • Guidelines for Implementing Traffic Responsive Mode in TxDOT ClosedLoop Traffic Signal Systems
    Guidelines for Implementing Traffic Responsive Mode in TxDOT Closed-Loop Traffic Signal Systems
    Balke, Kevin N. ;
    Rao, Keithireddipalli S.
    1996-09-01 | PDF
    This report provides guidelines and procedures for setting up a closed-loop traffic signal system to operate in a traffic responsive mode. It provides specific procedures for determining when two traffic signals should be coordinated. It also provides specific guidelines on when a closed-loop signal system should operate in a traffic responsive mod ...
  • Results of Simulation Studies Relating to the Operation of ClosedLoop Systems in a Traffic Responsive Mode
    Results of Simulation Studies Relating to the Operation of Closed-Loop Systems in a Traffic Responsive Mode
    Balke, Kevin N. ;
    Rao, Keithireddipalli S.
    1996-09-01 | PDF
    This report summarizes the results of simulation studies performed in the development of guidelines for implementing traffic responsive mode in closed-loop traffic signal systems. Simulation studies were performed to evaluate a revised interconnection desirability index which can be used to determine whether two traffic signals should be operated i ...
  • Analysis of a Differential Global Positioning System as a Sensor for Vehicle Guidance
    Analysis of a Differential Global Positioning System as a Sensor for Vehicle Guidance
    Bodor, Robert ;
    Alexander, Lee
    1996-09-01 | PDF
    An ongoing research project examines guidance systems, which can take over control of a vehicle if the driver becomes incapacitated. Part of this project includes an evaluation of a Differential Global Positioning System (DGPS) for vehicle-based lane sensing. This report documents the results of tests of the 5 Hz NovAtel RT20 DGPS receiver. A serie ...
  • Assessing Vehicle Detection Utilizing Video Image Processing Technology
    Assessing Vehicle Detection Utilizing Video Image Processing Technology
    Hartmann, Duane ;
    Middleton, Dan
    1996-09-01 | PDF
    The research documented in this report analyzed detection capabilities of a trip-wire video image processing system in a freeway setting. Count and speed accuracy, as well as occlusion, were parameters of interest in field testing at Texas A&M University's Riverside Campus research facility. Testing analyzed three camera heights, 9.1 m (30 ft.), 12 ...
  • Results of the ThirtySix Month Evaluation of the Texas Supplemental Maintenance Effectiveness Research Program SMERP Sites Final Report
    Results of the Thirty-Six Month Evaluation of the Texas Supplemental Maintenance Effectiveness Research Program (SMERP) Sites: Final Report
    Freeman, Thomas J.
    1996-09-01 | PDF
    The SMERP (Supplemental Maintenance Effectiveness Research Program) study was designed to study the types of maintenance treatments typically used in Texas. Six maintenance treatments and a control section were applied at twenty test locations throughout the state. Treatments included: asphalt rubber chip seal, polymer modified emulsion chip seal, ...
  • Locomotive Engineers Activity Diary
    Locomotive Engineer's Activity Diary
    Pollard, John K.
    ORCID ICON IMG
    1996-09-01 | PDF
    About 200 freight engineers working on several major railroads completed a 14-day diary recording such data as: the demographic characteristics of the participants; how much time they spent working, sleeping at home, sleeping away from home, commuting; and how much time they spent on all other purposes. Data were also gathered regarding the quality ...
  • Linking Real Time and Location in Scheduling DemandResponsive Transit
    Linking Real Time and Location in Scheduling Demand-Responsive Transit
    Kihl, Mary ;
    Crum, Michael
    1996-09-01 | PDF
    The specific objectives of this study are to : assess the benefits to a small rural demand-responsive transit operation of investing in smart technologies; assess the relative benefits of investments in automatic vehicle location (AVL) or dynamic scheduling in the context of a rural system; assess the potential increases in benefits to a small rura ...
  • Police Traffic Services in the 21st Century
    Police Traffic Services in the 21st Century
    United States. Department of Transportation. National Highway Traffic Safety Administration
    1996-09-01 | PDF
    In fall 1995, the Police Executive Research Forum of Washington, D. C., organized for the National Highway Traffic Safety Administration (NHTSA) a national seminar to discuss the factors that would affect the delivery of police traffic services in the 21s1 century. The seminar brought together traffic safety experts and law enforcement administrato ...
  • Determination Of Bridge Deck Subsurface Anomalies Using Infrared Thermography And Ground Penetrating Radar
    Determination Of Bridge Deck Subsurface Anomalies Using Infrared Thermography And Ground Penetrating Radar
    Alt, David G. ;
    Meggers, David A.
    1996-09-01 | PDF
    The purpose of this study was to evaluate the use of infrared (IR) thermography and ground penetrating radar (GPR) to find subsurface anomalies, delaminations and de-bonding, on asphalt concrete overlaid concrete bridge decks. The traditional "chaining" method is a less effective option for finding subsurface defects after an overlay is in place. A ...
  • Terrorism and Drug Trafficking Technologies for Detecting Explosives and Narcotics
    Terrorism and Drug Trafficking: Technologies for Detecting Explosives and Narcotics
    United States. Government Accountability Office
    1996-09-01 | PDF
    The General Accounting Office (GAO) examined information on explosives and narcotics detection technologies that are available or under development. This report discusses (1) funding for those technologies, (2) characteristics and limitations of available and planned technologies, and (3) deployment of technologies by the United States and foreign ...
  • Research on VehicleBased Driver StatusPerformance Monitoring Part III
    Research on Vehicle-Based Driver Status/Performance Monitoring, Part III
    Wierwille, Walter W. ;
    Lewin, Mark G.
    1996-09-01 | PDF
    A driver drowsiness detection/alarm/countermeasures system was specified, tested and evaluated, resulting in the development of revised algorithms for the detection of driver drowsiness. Previous algorithms were examined in a test and evaluation study, and were found to be ineffective in detecting drowsiness. These previous algorithms had been deve ...
  • Research On VehicleBased Driver StatusPerformance Monitoring Part I
    Research On Vehicle-Based Driver Status/Performance Monitoring, Part I
    Wierwille, Walter W. ;
    Lewin, Mark G.
    1996-09-01 | PDF
    A driver drowsiness detection/alarm/countermeasures system was specified, tested and evaluated, resulting in the development of revised algorithms for the detection of driver drowsiness. Previous algorithms were examined in a test and evaluation study, and were found to be ineffective in detecting drowsiness. These previous algorithms had been deve ...
  • Rural Roads and Bridges Condition and Financing of Local Bridges
    Rural Roads and Bridges: Condition and Financing of Local Bridges
    Walzer, Norman ;
    Deller, Steven C.
    1996-09-01 | PDF
    This report examines the condition of rural county and town bridges across the United States, with comparisons based on two data sets. The first is the results of surveys mailed to highway administrators in 2321 counties and 9064 towns in Fall 1994 and Spring 1995 to which a total of 539 counties and 1961 towns provided usable information. Responde ...
  • Rural Roads and Bridges Management Issues Facing Local Highway Officials
    Rural Roads and Bridges: Management Issues Facing Local Highway Officials
    Walzer, Norman ;
    Deller, Steven C.
    1996-09-01 | PDF
    The report documents management practices used by, and issues facing, local transportation administrators. Data are drawn from a national survey of county and town highway officials, in Fall 1994 and Spring 1995, which provided usable information from 609 counties and 1961 towns. Five specific issues are discussed: training opportunities and needs; ...
  • Rural Roads and Bridges Condition and Status of Roads
    Rural Roads and Bridges: Condition and Status of Roads
    Walzer, Norman ;
    Deller, Steven C.
    1996-09-01 | PDF
    Report examines the conditions of roads and bridges maintained by local governments. It is based on 609 responses from towns and 1961 from counties to mailed survey questionnaires in country engineers and town/township governments in Fall 1994 and Spring 1995. Survey results are comparable with a 1987 study which asked similar questions. Report cov ...
  • Roadside Vegetation Management
    Roadside Vegetation Management
    Martin, Dennis L ;
    Cargill, L M
    1996-09-01 | PDF
    The information contained within this report addresses: (1) Research -involving the use of experimental, newly labeled and traditionally available herbicides in combination with mowing for roadside vegetation management; (2) Maintenance implementation of research results into an operational phase of the Oklahoma Department of Transportation's (ODOT ...
  • Environmental Effects of Solid and Liquid Forms of Sodium AcetateFormate Deicer Ice Shear
    Environmental Effects of Solid and Liquid Forms of Sodium Acetate/Formate Deicer Ice Shear
    Bang, Sookie S
    1996-08-31 | PDF
    Ice Shear'" has been introduced as an alternative highway deicer. Ice Shear consists of a mixture of 1:1 molar ratio of sodium acetate and sodium and serves as a potentially efficient deicer causing little corrosive effect on metals or other surface structures. However, prior to the wide use of Ice Shear as a highway deicer. It is imperative to eva ...
  • Access management classification and spacing standards
    Access management classification and spacing standards
    Layton, Robert D. ;
    Stover, Vergil
    1996-08-23 | PDF
    The specific objectives of this background paper are:(1)Provide an overview ofthe relationship between the functional integrity of the highway system and theaccess management classification system, (2)Review and evaluate the currentOregon Department of Transportation (ODOT) access management classificationsystem, (3)Propose a new category structure ...
  • Aviation Acquisition A Comprehensive Strategy Is Needed for Cultural Change at FAA
    Aviation Acquisition: A Comprehensive Strategy Is Needed for Cultural Change at FAA
    United States. Government Accountability Office
    1996-08-22 | PDF
    The Federal Aviation Administration's (FAA) timely acquisition of new air traffic control equipment has become increasingly critical for aviation safety and efficiency. However, persistent acquisition problems raise questions about the agency's ability to field new equipment within cost, schedule, and performance parameters. Concerned about recurri ...
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