This document provides results of a detailed study to identify flexible and composite structures which will perform as zero-maintenance pavements. To accomplish this, the report identifies the major distress types which have seriously limited the maintenance-free life of flexible and composite pavements, selects analytical models for use in a struc
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This users guide discusses the criteria that may be applied to determine if an existing traffic signal should be removed. The material and techniques presented are relatively straightforward and, when applied, will provide a strong factual basis for reaching, supporting, and defending a signal removal decision. The signal removal criteria apply onl
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This report is the final report for a study involving the static vertical load testing of a full scale, instrumented pile group. The test group consisted of nine pipe piles instrumented for settlement, load transfer, pore pressures, total pressures and inclination. Two similarly instrumented reference (control) piles were also installed. Two smalle
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The programable calculator as a culvert designing tool offers many desirable features. Compared with the hand method, the calculator is more accurate, less time consuming, and eliminates all the searching through charts and nomographs. In one quarter of the time it takes to design one culvert by hand, the designer could use the calculator to design
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This manual provides programmable design procedures for both box and pipe culverts with either conventional or improved inlets, for the Hewlett Packard, HP-65 calculator. The same terminology and algorithms used in "The Design of Improved Inlets for Culverts" (HEC No. 13) are used in these programs. Each program listed in the manual is accompanied
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Additional tests were conducted on slotted drain inlets to extend design equations to a wider range of field installations. Total flow capture tests and partial flow interception tests were conducted for a range of slot widths, curb to slot distances, back slope, longitudinal slopes, and cross slopes. Design procedures are presented for slots with
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1980-10-01
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Nationwide Personal Transportation Survey (NPTS)
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PDF
The report is part of a series that provides findings from the 1977 Nationwide Personal Transportation Study (NPTS). The report provides information on characteristics of licensed drivers. The distribution of licensed drivers by place of residence, age and sex, is presented. Travel patterns of drivers are examined in terms of average annual miles d
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United States. Department of Transportation. Federal Highway Administration
1980-09-05
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PDF
In this publication are presented selected data on highway toll facilities in the United States in operation, under construction, or proposed at the beginning of 1980.
The objective of this study was to determine the feasibility of accommodating the physically handicapped on over- and undercrossing structures. Based upon the evaluation of 124 crossing structures, 86 percent of these structures had at least one major access barrier. Alternative solutions for identified major access barriers were developed and exam
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There are many interrelated factors that determine the reliability and structural integrity of welded steel bridges. Foremost among these are proper materials, design, fabrication, quality control and quality assurance. Any one of these factors can contribute to fatigue and fracture of a bridge detail. Recent service failures of welded steel bridge
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United States. Federal Highway Administration. Office of Highway Planning
1980-09-01
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PDF
In an effort to reduce total data reporting, eliminate duplication, and coordinate all planning data reporting requirements, the Mileage Facilities Reporting System has been merged with the Highway Performance Monitoring System (HPMS). A manual is provided which contains guidelines for reporting (merged) HPMS data and establishing update procedures
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This interim report presents the results of a review of ten selected state highway design manuals, discussions with state design and traffic operation engineers and a literature review with specific attention given to ramp and speed change lane criteria. For comparison, additional documents from the American Association of State Highway and Transpo
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The use of sulfur in highway paving mixtures has introduced questions regarding the pollutants generated, their environmental impact and the safety aspects associated with mix preparation and placement. This report presents the results of an investigation in which these factors are assessed. The study considered the safety and environmental aspects
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The report presents the results of a study to develop criteria that may be adopted as warrants for the removal of existing traffic control signals. The development of the signal removal criteria was based largely, as in a legal argument, on precedent. Those cases where positive impacts were realized by removing signals served to identify the criter
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This report describes a series of experiments that were conducted to examine the effectiveness of four-way flashers. Both the disabled vehicle situation and the slow-moving vehicle situation were examined at two- and four-lane locations under both daylight and nighttime conditions. The disabled vehicle tests involved parking a test vehicle (either
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The complexity of a driver's tasks in safely and efficiently utilizing the highway system is largely dependent upon the inputs presented to the visual senses. Visual complexity is determined by road geometry; maneuvering of other traffic; adjacent land uses; pedestrian activity; weather; traffic control devices, lighting, and maintenance of the roa
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This report describes a series of experiments that were conducted to examine the effectiveness of four-way flashers. Both the disabled vehicle situation and the slow-moving vehicle situation were examined at two- and four-lane locations under both daylight and nighttime conditions. The disabled vehicle tests involved parking a test vehicle (either
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