This volume presents design procedures that can be used to improve existing interchanges with traffic operational or safety problems. The procedures are intended primarily for application to freeway-arterial interchanges located in urban and suburban areas. However, similar procedures would be appropriate for freeway-freeway interchanges and for in
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This volume presents evaluations of the traffic operational and safety effectiveness of 40 recent interchange rehabilitation projects. All of the projects involved geometric design modifications at freeway-arterial interchanges in urban and suburban areas. The evaluations, presented in case study form, describe the geometrics of each interchange, t
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This series of reports represents a comprehensive treatment of highway construction noise characterization, measurement, prediction, and abatement, based on a literature review and original research. The major result of the study is a prediction model for highway construction noise with charts, calculator and computer program methods for its use. A
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Currently recommended guardrail and median barrier breakaway cable terminals (BCT) were to be evaluated for performance with 1800-lb (800-kg) class minicars. Early findings indicated unsatisfactory performance of the guardrail BCT for end-on impacts at 60 mph (97 km/h). The study was redirected to develop and evaluate a retrofit design for achievin
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This research was conducted to investigate the operational effects of cross-slope breaks on highway curves. These breaks are created by the superelevation of the traveled way and the adverse shoulder slope. HVOSM simulation studies were performed on a variety of break designs to test the effects of curvature, speed and vehicle path on vehicle opera
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Deer mirrors were placed in 12 random 0.5-mile test sections along 14.8 miles of I-95 between Topsham and Gardiner, Maine, to test the effectiveness of the mirrors in reducing deer-vehicle collisions. In nearly 4 years, 11 deer-vehicle collisions were reported. Of these, 4 were on the mirrored sections, 2 were on the non-mirrored sections, and the
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This is the second volume of a three-volume report. This Volume 2 describes various groundwater control methods for keeping tunnels dry during the life of the structure. The methods discussed include means employed to provide impervious structural concrete, types of waterproofing membranes, methods used to seal segmented tunnel linings, grouting of
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This volume is a summary of current practice on groundwater control systems used during construction of both cut-and-cover and bored tunnels in urban areas. Eight (8) groundwater control methods are discussed including dewatering, recharge, cutoff walls and trenches, grouting, freezing, compressed air, slurry and earth pressure balance shields and
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This volume summarizes Volumes 1 and 2 and presents guidelines for re- commended best practice in a concise format. Design and construction details not included in the more general descriptive nature of Volumes 1 and 2 are included herein. The final chapter of this volume is a discussion and recommendations for possible implementation of innovative
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United States. Federal Highway Administration. Demonstration Projects Division
1982-04-01
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Spiraling highway construction costs, loss of highway revenues, the uncertain status of energy supplies, and the possible exhaustion of usable aggregate sources are rising concerns being addressed by the highway community. Conservation of available materials, reduction of construction costs, and minimization of energy use are goals that can be acco
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The objectives of this study are to: (1) review current truck escape ramp literature; (2) document all acceptable designs; (3) determine any and all shortcomings in the current method of arresting heavy vehicles and recommend specific research needs to eliminate these deficiencies; and (4) develop a framework of information, criteria, and specifica
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This project had the objectives of developing and characterizing stable modified-sulfur water emulsions using sulfur-extended-asphalt and Sulphlex as base stocks. Anionic and cationic emulsions which had rapid and slow setting characteristics were studied. Standard asphalt emulsion formulations using base stocks containing sulfur produced unstable
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A structural evaluation of PCC highway shoulders has been conducted and a comprehensive design procedure for plain jointed concrete shoulders developed. The procedure can be used to provide PCC shoulders either for rehabilitation of existing pavement, or for new pavement construction. All major factors that are known to affect the behavior of PCC s
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This report discusses the effects of truck size on the behavior of drivers who interact with trucks in selected roadway situations. Specifically, truck length/configuration was addressed in a freeway entrance merge, mainline lane change, and narrow bridge situations while truck width was studied in a rural two-lane, two-way passing situation. Field
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Federal Highway Administration Technology Transfer Program—A Historical Perspective; Field Activities in Technology Transfer; Implementation of Highway Research: Yesterday, Today, and Tomorrow; Demonstration Projects Program; NHI—A Leader in Technology Transfer; Experimental Projects Program
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