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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 30961 - 30980 of 35440 results
  • Field Evaluation of Coarse Aggregate Types Criteria for Test Sections
    Field Evaluation of Coarse Aggregate Types: Criteria for Test Sections
    Hankins, Kenneth ;
    Suh, Young Chan
    1991-01-01 | PDF
    Concrete pavements are subjected to a variety of stresses and, as a result, the pavement slab is in continuous motion. Some of the more significant stresses present are environmental loads, or those developed by the thermal and shrinkage movements of the paving material. When the environmental loads are combined with the wheel and gravity loads, co ...
  • The Development of Smoothness Specifications for Rigid and Flexible Pavements in Texas
    The Development of Smoothness Specifications for Rigid and Flexible Pavements in Texas
    Harrison, Robert ;
    Bertrand, Carl
    1991-01-01 | PDF
    Because both the highway agency and the traveling public desire a smooth pavement surface, there exists a need to ensure smoothness and ride quality. Indeed, a smooth road profile has become a standard measure of pavement quality. Smoothly constructed roads are associated with minimal vehicular wear (and there­ fore cost), user perceptions of quali ...
  • Critical Evaluation of Parameters Affecting Resilient Modulus Tests on Subgrades
    Critical Evaluation of Parameters Affecting Resilient Modulus Tests on Subgrades
    Feliberti, Manuel ;
    Nazarian, Soheil
    1991-01-01 | PDF
    This report contains a critical evaluation of the resilient modulus testing procedure based on more than 200 tests. The state-of-the-art for obtaining and interpreting resilient modulus data is reviewed. The initial testing procedures proposed by the American Association of State Highway and Transportation Officials (AASHTO) and modified by the Str ...
  • Speed Zoning on Texas Highways
    Speed Zoning on Texas Highways
    Texas Transportation Institute. Texas A&M University
    1991-01-01 | PDF
    Most traffic problems are not simple nor do they have simple solutions. Citizen demands for speed zoning are sometimes made with the admirable motive to "quick-fix" a particular problem. No single traffic control tool, however, can be a cure-all for traffic problems in a community. This pamphlet shows what speed zoning can and cannot do.
  • Modulus 40 Users Manual
    Modulus 4.0 User’s Manual
    Scullion, Tom ;
    Michalak, Chester H.
    1991-01-01 | PDF
    The MODULUS program, a modulus back calculation system described in this report, has been developed by the Texas Transportation Institute for the Texas Department of Highways and Public Transportation. See TTI Research Reports 1123-1 and 1123-2 for background and technical details. This system is intended to be used when analyzing data collected wi ...
  • Design Guidelines and Other Considerations for Strategic Arterial Streets
    Design Guidelines and Other Considerations for Strategic Arterial Streets
    Kruger, Theunis J ;
    Lee, Clyde E
    1991-01-01 | PDF
    The overall objective of Study 1107 is to discover an alternative means of increasing the supply of high-quality traffic service in urban areas. Urban freeways have, for a variety of reasons, become overloaded and difficult to augment. A plausible alternative is to improve the quality and scope of the urban arterial street system so that these stre ...
  • Prevention of Longitudinal Cracking in Surfaces and Fills
    Prevention of Longitudinal Cracking in Surfaces and Fills
    Wray, Warren K. ;
    Ellepola, C. B.
    1991-01-01 | PDF
    Cracking parallel to the highway alignment (longitudinal cracking) was discovered in flexible pavement constructed over high-PI clay embankments retained by reinforced soil retaining walls (RSRWs). The cracks were noted to occur at approximately the location of the interface between the clay embankment and the cohesionless backfill of the RSRW. Cor ...
  • An investigation of toll plaza capacity and level of service
    An investigation of toll plaza capacity and level of service.
    Woo, Tzong-Shiou Hugh ;
    Hoel, Lester A
    1991-01-01 | PDF
    This study was undertaken to accomplish two objectives pertinent to traffic characteristics at toll plaza areas: (1) to develop a methodology for evaluating the capacity of a toll plaza, and (2) to establish level-of-service criteria for toll area traffic. Traffic data at the four toll plazas of Virginia's Richmond-Petersburg Turnpike were collecte ...
  • Pressurized storm sewer simulation model enhancement
    Pressurized storm sewer simulation : model enhancement.
    Yu, Shaw L ;
    Wu, Yin
    1991-01-01 | PDF
    A modified Pressurized Flow Simulation Model, PFSM, was developed and attached to the Federal Highway Administration, FHWA, Pool Funded PFP-HYDRA Package. Four hydrograph options are available for simulating inflow to a sewer system under surcharge or pressurized conditions. Several key parameters, such as time-step and print options, are dicussed ...
  • An investigation of the feasibility of interactive videodisc as a training mode for VDOT
    An investigation of the feasibility of interactive videodisc as a training mode for VDOT.
    Hunter, Peggi E ;
    Perfater, Michael A
    1991-01-01 | PDF
    This report addressed the potential application of interactive videodisc (IVD) technology in the Virginia Department of Transportation (VDOT). The research revealed that IVD is a growing force as a training vehicle in several industries and institutions and pointed to multiple training possibilities for VDOT. Responses to an IVD user survey sent to ...
  • Petrographic manual petrographic methods of examining hardened concrete including introduction sample preparation questions and suggestions and reading list
    Petrographic manual : petrographic methods of examining hardened concrete, including introduction, sample preparation, questions and suggestions, and reading list.
    Walker, Hollis N
    1991-01-01 | PDF
    This manual was undertaken to record for all persons wishing to do concrete petrography the petrographic procedures that have been found useful here at the Virginia Transportation Research Council. This interim report is made up of the introduction, reading list, sections on sample preparation, and suggestions for further research. The final manual ...
  • The tension between Freedom of Information and Privacy Protection Acts for State Departments of Motor Vehicles
    The tension between Freedom of Information and Privacy Protection Acts for State Departments of Motor Vehicles.
    Brady, Patricia M
    1991-01-01 | PDF
    With the increasing demand for the release of information gathered by governmental agencies, tension has arisen between the desire to disseminate public records and the desire to withhold an individual's personal information. The purpose of this paper is to examine the relationship between the freedom of information acts (FOIA) and the privacy acts ...
  • Optimum mixture proportions for concretes containing fly ash and silica fume
    Optimum mixture proportions for concretes containing fly ash and silica fume.
    Ozyildirim, H. Celik ;
    Halstead, Woodrow J
    1991-01-01 | PDF
    Concretes with equal water/cement ratios and equal paste volumes of various combinations of cement, fly ash, and silica fume were tested to establish parameters for strength and chloride permeability. Comparative specimens with Type II and Type III cement were tested. The effects of temperature and moisture availability during curing were also eval ...
  • Evaluation of novophalt as an additive in asphalt
    Evaluation of novophalt as an additive in asphalt.
    Maupin, G. W
    1991-01-01 | PDF
    Novophalt, which is an ethylene vinyl acetate polymer, was used as an asphalt additive in a test section in an attempt to determine whether it is useful in the prevention of rutting. A special blending unit was required to blend the asphalt cement and polymer at the hot-mix plant; however, construction of the control and polymer test sections went ...
  • Experimental use of rubbertire rollers as a means of improving density in asphalt overlays
    Experimental use of rubber-tire rollers as a means of improving density in asphalt overlays.
    Hughes, C. S
    1991-01-01 | PDF
    This study reports the results of comparative tests on sections of asphalt pavement rolled with conventional steel-wheel rollers and those rolled with a rubber tire roller added between the steel-wheel breakdown and steel wheel finish rollers. Nuclear density and air voids were used as measures of potential differences between sections. Of the 15 p ...
  • Evaluation of the use of high molecular weight methacrylate monomers to seal cracks in decks on I81 over the New River
    Evaluation of the use of high molecular weight methacrylate monomers to seal cracks in decks on I-81 over the New River.
    Sprinkel, Michael M
    1991-01-01 | PDF
    This report presents the results of a study undertaken to evaluate the installation and performance of two high molecular weight methacrylate monomers used to treat the cracks and seal the surfaces on two bridges on I-81 over the New River. The evaluation is based on data collected during the treatments, skid tests, permeability tests on cores remo ...
  • Design of heavy duty mixes
    Design of heavy duty mixes.
    Maupin, G. W
    1991-01-01 | PDF
    Permanent deformation of asphalt concrete, which is frequently manifested by excessive pavement rutting, has become a problem in much of the United States. Virginia began to experience rutting problems on highways with heavy traffic in the early 1980s. The purpose of this study was to evaluate several promising test procedures that could be used to ...
  • An expert system as applied to bridges testing phase final report
    An expert system as applied to bridges : testing phase : final report.
    Zuk, William ;
    Newbrough, Jonathan
    1991-01-01 | PDF
    This project concludes a four part study regarding the development of an expert system called DOBES, to form conclusions as to the disposition of older bridges. The options include replacement, rehabilitation, improvement, abandonment and routine maintenance. The final phase tested and refined the program, producing excellent results, useful for ge ...
  • Coordination of Transportation Planning and Land Use Control A Challenge for Virginia in the 21st Century Final Report
    Coordination of Transportation Planning and Land Use Control: A Challenge for Virginia in the 21st Century: Final Report
    Vander Lugt, Robert D ;
    Virkar, Salil R
    1991-01-01 | PDF
    The public power to control the use of land is primarily exercised by city and county officials in Virginia. Control over the location and characteristics of transportation facilities, including roads and mass transit, is exercised primarily by the Commonwealth through the Virginia Department of Transportation. Unlike most other states, Virginia re ...
  • Developing design elements for scenic byways in Virginia final report
    Developing design elements for scenic byways in Virginia : final report.
    Purinton, Bradbury ;
    Hoel, Lester A
    1991-01-01 | PDF
    Virginia has had a scenic roads program since 1966 that provides for the designation of certain roads as Virginia Byways. This program does not require the application of any special technical requirements in the selection, designation, maintenance, or modification of these roads. The research reported herein was undertaken to determine (1) whether ...
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