As part of a cooperative agreement between the Tennessee Department of Transportation and the Federal Highway Administration, a study was conducted to evaluate current levels of digital camera and color printing technology with regard to their application to bridge safety inspection. The results, which are further detailed in this report, generally
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The purpose of this FHWA-sponsored workshop is to introduce transportation professionals, from state and local transportation agencies in particular, to the basic concepts of developing, implementing, and maintaining an Integrated Transportation Information System (ITIS). The workshop explains the benefits of integrating information, and practical
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This publication is produced every 10 years and provides a general summary of information on highways, their use, and their financing through 1995. The information presented in this volume supplements and, in some instances, supersedes similar data presented in the five earlier Highway Statistics Summary publications. Included are statistical and a
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An important property of materials that defines the viscoelastic and inelastic characteristics of materials is the dissipated work or dissipated energy of the material. Dissipated energy has been used in the asphalt concrete fatigue area for many years by some agencies. The falling-weight deflectometer (FWD) load deflection-time data can be used to
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The P46 Laboratory Startup and Quality Control Procedure was developed to ensure the accuracy and reliability of the resilient modulus data produced while testing soil and aggregate materials using closed-loop servo-hydraulic systems. It was developed to provide performance benchmarks for resilient modulus testing equipment and laboratory technicia
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Many metropolitan areas have begun or are planning to implement traffic monitoring programs to meet the many demands for traffic data. The purpose of this project is to document a series of examples of urban traffic monitoring data collection programs in order to support the development of urban traffic monitoring databases and promote the upgradin
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The User Needs and Technology Assessment Report is one in a series of interim documents for the Rural Applications of Advanced Traveler Information Systems (ATIS) project. The document describes the research design and findings from rural traveler surveys to identify and prioritize traveler information needs in rural and small urban areas (less tha
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The Recommended Action Plan is one in a series of interim documents for the Rural Applications of Advanced Traveler Information Systems (ATIS) project. Based on the investigation of user needs, a technology review, and concept development and assessment, the plan suggests a recommended direction for ITS deployment in rural and small urban areas (le
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Efforts to improve quality in highway construction embrace many aspects of the construction process. Quality goals include enhanced efficiency and productivity, optimal cost and delivery time, improved performance, and changes in attitude-promoting a team approach and focusing on the highway user as a valued customer. One facet of this comprehensiv
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The deterioration of various reinforced concrete bridge components containing conventional black steel reinforcement is the most important problem facing U.S. highway agencies. A major cause of this concrete deterioration (cracking, delamination, and spalling) is the corrosion of the embedded steel reinforcement, initiated by chloride ions from dei
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This report describes the work of the study, “Systems Planning for Automated Commercial Vehicle Licensing and Permitting Systems.” The objective of this study is to define the market, organization, and resource requirements for a national program for the application of Intelligent Transportation Systems (ITS) to commercial vehicle operations (CVO).
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The objective of this research was to develop statistical models for defining the relationship between traffic accidents and highway geometric design elements and traffic volumes for interchange ramps and speed-change lanes. The database used to develop the models consisted of data for interchange ramps and speed-change lanes in the State of Washin
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This project evaluated the effectiveness of symbol traffic signs for young, middle-aged and elderly drivers. Daytime legibility distance and comprehension of 85 symbols in the Manual on Uniform Traffic Control Devices (MUTCD) were measured. Legibility distance under night and night-with-glare conditions, glance legibility, reaction time and conspic
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This report presents the findings of a 2-year, multitask study to provide a new generation of Sulphlex binders with enhanced low-temperature fracture resistance. The initial phases of the program dealt with the preparation and base-line characterization of Sulphlex 233 and 198, First and Second Generation Sulphlex, respectively, considered the more
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Micropiles are small-diameter, drilled and grouted reinforced piles used for both structural support and in situ earth reinforcement. They were conceived in Italy in 1952, but have become popular in the United States only since the mid-1980s. This report provides a comprehensive state-of-practice review, drawing on data from an international basis.
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Micropiles are small-diameter, drilled and grouted reinforced piles used for both structural support and in-situ earth reinforcement. They were conceived in Italy in 1952 but have become popular in the United States only since the mid 1980s. This report provides a comprehensive state-of-practice review, drawing on data from an international basis.
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Micropiles are small-diameter, drilled and grouted reinforced piles used for both structural support and in-situ earth reinforcement. They were conceived in Italy in 1952, but have become popular in the United States only since the mid 1980s. This report provides a comprehensive state-of-practice review, drawing on data from an international basis.
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Micropiles are small-diameter, drilled and grouted reinforced piles used for both structural support and in situ earth reinforcement. They were conceived in Italy in 1952, but have become popular in the United States only since the mid-1980s. This report provides a comprehensive state-of-practice review, drawing on data from an international basis.
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With the goal of improving future concrete pavement design and construction practices, this project evaluated the performance of 303 inservice concrete pavement sections located throughout North America. An extensive field testing program, consisting of pavement condition surveys, drainage surveys, falling weight deflectometer (FWD) testing, coring
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The objective of this research project was to identify conspicuity, recognizability, and comprehensibility problems with object markers, particularly as they relate to the needs and capabilities of the older driver. This was accomplished through a series of tasks and three sets of experiments (problem identification, laboratory and field studies) w
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