The results of the project to collect freeway traffic data for use in developing and verifying incident detection algorithms are presented in three volumes. This volume contains instructions on the usage of a FORTRAN program to analyze data collected in Volumes 1 and 2: Vol. 1, RD-76-175, Traffic Data Sets from Widely Spaced Detectors; and, Vol. 2,
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The results of the project to collect freeway traffic data for use in developing and verifying incident detection algorithms are presented in three volumes. This volume gives a description of the 80 data sets collected from the closely spaced detectors on a section of the San Diego Freeway. This freeway is part of the 42-mile freeway loop that had
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This report summarizes the research completed in the third phase of a three-phase project. This phase was directed at identifying and evaluating alternatives to full signalization at pedestrian crossings. These pedestrian crossings are located at the intersection of a high-volume arterial street and a low-volume residential street. The selection of
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This report summarizes that portion of the research dealing with pedestrian signal displays and operation which was completed in Phase II of the three-phase project on urban intersection improvements for pedestrian safety. Three evaluation studies were conducted. The first study was a controlled experiment to determine what difference existed betwe
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This purpose of the study was to identify problems associated with pedestrian-vehicle interactions at intersections, develop countermeasure concepts that would reduce these problems, and evaluate the most desirable countermeasures to determine their effectiveness. As an additional phase, Federal Highway Administration included a study to evaluate a
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This report summarizes the research completed in the first phase of a three-phase project. This phase was directed at identifying and defining the safety and operational problems associated with the interaction of pedestrians and vehicles at intersections. Both signalized nonsignalized intersections were investigated. Four sources of information we
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This report presents the final results of the signal timing element of the FHWA research project "Urban Intersection Improvements for Pedestrian Safety." The report discusses the research which was conducted, and recommends improvements in the timing of pedestrian traffic signals both to maximize safety and to minimize delay. Specifically, the elem
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The use of municipal incinerator residue as aggregate in bituminous pavement construction was evaluated in the laboratory and in the field. A test installation, placed in Washington, D.C. in June 1977, consisted of a 4 1/2-in.(114.3mm) bituminous pavement composed largely of incinerator residue. The base was placed in two lifts and finished over co
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Design of Segmental Bridges; The Escalating War on Reduced Visibility; A Human Factors Assessment of Decreased Traffic Signal Brightness; New Materials and Systems for Improved Traffic Lane Delineation; Truck Characteristic and Stress Spectra for Steel Highway Bridges
Improved methods for design and pollution abatement evaluation of urban highway drainage facilities require not only the average rainfall intensity of the storm but also the time distribution of the rainfall. Since the temporal pattern of rainfall varies with storms and the patterns of future storms cannot be predicted exactly, the design hyetograp
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The overall purpose of this multiphased research study was to establish visibility requirements for roadway delineation that can be used to help establish the cost-effectiveness of a variety of delineation treatments. Given the visibility requirements developed here and subsequent cost/benefit analysis, a rational approach can be taken for the deve
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The yellow highway paint in current use is often not as visible as white paint under adverse lighting and weather conditions. It has lower initial brightness, darkens more rapidly with exposure, and contains lead pigment (PbCro4) which is more toxic and more expensive than white pigment (Ti02). This study showed that up to 50 percent (by weight) of
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Potter's method for runoff peak forecasting was examined on its original watersheds and it was found to be soundly conceived. The method was modified to extend it to other watersheds in the same States for which it was originally developed. The results after modifying Potter's C parameter were found to be satisfactory. The method was simplified and
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Frequency analyses of more than 1,000 small watersheds in the United States and Puerto Rico were used to develop the estimation method for design of peak flow for ungaged watersheds. This method, called the Federal Highway Administration (FHWA) method, is conceptually similar to the Bureau of Public Roads (BRP) method developed by W.D. Potter. The
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This manual presents design procedures for overlays of both flexible and rigid pavements. The design procedure includes an evaluation of the existing pavement based on nondestructive deflection testing, condition surveys, and materials sampling and testing. Based on this information the pavement is divided into separate design sections and each sec
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Two reports on variables related to highway advisory radio are presented. In one study, warning material in short, staccato messages was compared to warning material in long, detailed messages. The long, detailed messages were retained consistently better than the short, staccato ones. The second experiment investigated the effect of route numbers
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Appendix A contains the annual flood frequency curves and the data for each State arranged alphabetically. The other volumes of this report are: FHWA-RD-77-158 Vol I Research Report. FHWA-77-159 Vol II Recommendations for Preparing Design Manuals and Appendices B, C, D, E, F,G, and H.
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