John A. Volpe National Transportation Systems Center (U.S.)
1995-01-01
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MOBILE is a computer model developed by the U.S. Environmental Protection Agency (EPA) for estimating emissions of air pollutants by motor vehicles. Using information on the types and ages of vehicles and on local driving conditions, MOBILE estimates emissions of various pollutants during each mile that different types of vehicles are driven. These
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United States. Department of Transportation. Federal Highway Administration
1995-01-01
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A nationwide survey of environmental mitigation projects identified many highway departments and communities that had found truly creative solutions to the intrusion of highway construction. A documentary videotape, featuring three of these communities, shows the cooperative negotiations and technical solutions that brought competing interests toge
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In the summer of 1991, a research project was conducted at the Federal Outdoor Impact Laboratory (FOIL) in McLean, Virginia, to investigate vehicle side impacts with guardrail terminal ends. Four terminal end designs were tested using 1985 Honda Civics. The four designs were a standard breakaway cable terminal (BCT), an eccentric loader terminal, a
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The Highway Geometric Design Consistency (HGDC) program is a menu-driven microcomputer-based procedure for evaluating the geometric design consistency of rural two-lane highways in level or rolling terrain. The program estimates two measures of horizontal alignment design consistency: the decrease in 85th percentile operating speed, and the increas
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The Entry/Exit Implementation Strategy analysis attempts to identify and analyze the most important issues in the roadway implementation of the AHS entry and exit associated functions. The analysis takes a broad system engineering approach to assure that all entry/exit occasions on the AHS are considered. The top level issues addressed were: - The
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United States. Department of Transportation. Federal Highway Administration. Office of Real Estate Services
1995-01-01
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En los Estados Unidos, un pois que cambia constantemente, los programas gubernamentales disenados para beneficiar al sector publico en general, frecuentemente resultan en adquisicion de la propiedad privada, y en ciertas ocasiones desplazan a las personas de sus viviendas, negocios o granjas. Su gobierno paso la "Ley de Politico Uniforme de Asisten
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The National Institute of Standards and Technology, at the request of the Federal Highway Administration, has conducted a study of potential applications of automation and robotics technology in construction, maintenance, and operation of highway systems. The study included a workshop exploring industry perceptions of needs and barriers to adoption
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Four on-road experiments investigated whether the assumed values for driver perception-reaction time (PRT) used in AASHTO design equations adequately represent the range of actual PRT for older drivers. The Case III (stop controlled) intersection sight distance (ISD) experiment found that older drivers did not have longer PRT than younger drivers;
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If we proceed to use a multi-resolution cellular automata approach to representing traffic in simulation, we must consider this general issue of implicit characteristics, which encapsulates a number of particular issues like driver reaction time delays. This paper is intended to motivate these issues, and introduce some approaches to creating multi
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United States. Department of Transportation. Federal Highway Administration
1995-01-01
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Nationwide accident statistics show that more than 50 percent of fatal accidents occur during the hours of darkness. Because only 25 percent of travel occur during the same period, the fatality rate is about three times higher at night than during the day. The installation of overhead lighting is a potential countermeasure to this nighttime acciden
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United States. Federal Highway Administration. Office of Technology Applications
1995-01-01
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Workshop on Alkali-Silica Reaction (ASR) prepared as part of FHWA's SHRP product implementation program under ISTEA. The information in this document summarizes SHRP studies on ASR (C-202) and aims to disseminate information on ASR, and provides solutions to avoid and address problems caused due to ASR.
United States. Federal Highway Administration. Office of Engineering
1995-01-01
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This report documents several examples of ways that underdrain outlets may become blocked, causing excess water to concentrate in the pavement, based on a review of approximately 100 lane miles of and Interstate and Parkway Route. The review was initiated due to the observation of asphalt stripping from the pavement surface.
This report describes the operation theory, installation procedures and operation guidelines for instrumentation selected to monitor changes in internal pavement moisture and thermal regimes, frost/thaw conditions, and external climate at test sections in the long-term pavement performance seasonal monitoring study. The instrumentation includes tim
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