This research was performed to complete and advance the status of recently developedprocedures for analysis and design of weaving sections (known as the Leisch method and-initially published in the 1979 issue of ITE Journal). The objective was toenlarge upon and complete the earlier work through calibration of the method by usingdata from the BPR W
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This research was performed to complete and advance the status of recently developed procedures for analysis and design of weaving sections (known as the Leisch method and-initially published in the 1979 issue of ITE Journal). The objective was to enlarge upon and complete the earlier work through calibration of the method by using data from the BP
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Previous analyses conducted by the Federal Highway Administration (FHWA) are used to project year-by-year economical impacts of changes in highway performance out to 1995. In the principal scenario examined, highway performance is allowed to deteriorate over time. This leads to reduction in aggregate economic welfare in terms of higher prices and l
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The purpose of this study was to determine the operational and safety effects of various pedestrian signalization alternatives. An analysis was conducted of pedestrian accidents, traffic and pedestrian volumes, geometrics, and signal data for 1,297 signalized intersections in 15 U.S. cities to determine the safety effects of pedestrian signals and
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This is a summary of the use, by 43 agencies, of non-traditional techniques for funding transit and urban highway services. This report is designed to introduce public officials and transportation planners at the state and local levels to a range of available funding sources and to facilitate their efforts in determining whether these sources will
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Production of lime and portland cement results in the annual generation of more than 20 million tons of kiln dust, mostly cement kiln dust. The purpose of this investigation was to determine the effectiveness of substituting kiln dusts for hydrated lime in lime-fly ash-aggregate road base systems. A total of 45 kilm dust samples, including 33 cemen
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The Roadway Lighting Handbook (IP-78-15) deals with all aspects of visibility requirements, equipment, system design, operation and maintenance of a roadway lighting system. A major change from illuminance to pavement luminance as a criterion for lighting design has been made in ANSI RP-8, 1983. This addendum to the chapter on lighting design (Chap
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Thirty-one relatively large reinforced concrete slabs were fabricated in 1980 using either non-specification epoxy-coated reinforcing steel or calcium nitrite admixture with black (uncoated) steel. Their performance is compared with uncoated steel in concrete without admixtures. The slabs were placed in two lifts: the bottom lift consisted of a bot
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This report discusses the performance of four full scale prestressed concrete pavements built between 1971 and 1979 in different parts of the United States in various climatic areas carrying a range of traffic. The information was developed by a panel made up of representatives from each of the four States where a full scale prestressed pavement wa
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A Dream Becomes a Reality; Continuous Monitoring of Density and Temperature of Asphalt Concrete During Compaction; The Use of Road Markings to Narrow Lanes for Controlling Speed in Residential Areas; Guidelines for Designating Routes for Transporting Hazardous Materials; National Railroad-Highway Crossing Inventory
The principal objective of this research project was to investigate the feasibility of using accident surrogate measures in highway safety analyses. An accident surrogate measure is defined as a quantifiable observation that can be used in place of or as a supplement to accident records. The study provides evidence that surrogate measures for accid
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The principal objective of this research project was to investigate the feasibility of using accident surrogate measures in highway safety analyses. An accident surrogate measure is defined as a quantifiable observation that can be used in place of or as a supplement to accident records. The study provides evidence that surrogate measures for accid
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The principal objective of this research project was to investigate the feasibility of using accident surrogate measures in highway safety analyses. An accident surrogate measure is defined as a quantifiable observation that can be used in place of or as a supplement to accident records. The study provides evidence that surrogate measures for accid
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This report is in two parts. Part I describes a comprehensive state-of-the-art study on the use of precast concrete in bridge decks with emphasis on connection methods and devices used. Three types of decks were examined: 1) Stay-in-place forms for cast-in-place decks; 2) full depth precast decks on girders and 3) precast, usually prestressed integ
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This research covers five main areas for which appropriate exposure measures have been developed, and the following chapters deal with each of these in turn. Chapter 2 covers intersections and includes discussion of the associated concerns of free flow, stop sign, or signal controlled intersections as well as single lane versus multi-lane configura
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This manual, which provides measures of exposure for the many different research problems faced by the researcher, focuses on the following areas of exposure measures: intersection accidents; interchange accidents; accidents on non-intersection roadway segments; fixed object collisions; and accidents involving specific vehicle types. Primary emphas
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