1991-12-01
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Nationwide Personal Transportation Survey (NPTS)
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This report is part of a series of products from the 1990 Nationwide Personal Transportation Survey (NPTS). In the NPTS, information is collected on the amount and nature of personal travel in the U.S., as related to the demographics of persons and households. This report is designed to serve as documentation for the public use datafiles and, as su
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This guide can help practicing civil engineers to identify rocks and minerals and to better understand their characteristics and performances in certain applications. The equipment needed for the procedures in this guide is inexpensive and easily obtained. The procedures rely as much as possible on the visual appearance of rocks and minerals. Basic
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National Productivity in the United States increasingly depends on fast and reliable transportation. For this Nation to compete successfully in the world marketplace and to continue its standard of living, we must ensure the stability of our transportation systems. Americans use U.S. roads and highways more than nay other mode of transportation in
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This publication is the 46th of an annual series. It presents the 1990 analyzed statistics of general interest on motor fuel, motor vehicles, driver licensing, highway-user taxation, State highway finance, highway mileage, and Federal aid for highways; and 1989 highway finance data for municipalities, counties, townships, and other units of local g
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The purpose of this study was to determine the horizontal curve features which affect safety and traffic operations and to quantify the effects on accidents of various curve-related improvements. The primary data base developed and analyzed consisted of 10,900 horizontal curves in Washington State. Three existing federal data bases on curves were a
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This report presents the results of a research conducted in a hydraulic flume todetermine the stability of rock riprap protecting abutments located on floodplains. The observed vulnerable zone for rock riprap failure is presented fortwo abutment types: vertical wall and spill-through (H:V = 2:1).Equations and velocity multipliers to assist an engin
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Bridge Temporary Works Research Program; University Transportation Centers Program: Education and Research for the 21st Century; Portland Cement Concrete Program: Rehabilitation Challenges and Recommendations
This report documents an evaluation of the state-of-the-art capabilities of nuclear density gauges to monitor the density of asphalt concrete. In particular, providing immediate information on compaction by the use of roller-mounted gauges and measuring the densities of thin layers were addressed. The study included three phases: literature search,
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Researchers in the field of accident analysis have long been aware of the problems associated with drawing statistical inference on safety using accident data. Aside from the problems of accessibility and quality, accident data present a real challenge when it comes to statistical analysis. One of the most serious problems in accident analysis is t
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This study sought to reduce the risks of wet, nighttime driving by determining the minimum visibility required of roadway delineators. To isolate the contributions that discrete delineators have on guidance vision and drivers' reactions, test subjects were shown electronically digitized photographs of wet, nighttime roadways to which simulated deli
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Researchers in the field of accident analysis have long been aware of the problems associated with drawing statistical inference on safety using accident data. Aside from the problems of accessibility and quality, accident data present a real challenge when it comes to statistical analysis. One of the most serious problems in accident analysis is t
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Fatalities from motor vehicle accidents in work zones continue to increase. To improve safety and efficiency of day-to-day maintenance and operations of work zones, the Federal Highway Administration sponsored a two-day symposium, "Work Zone Traffic Control Symposium--Making It Work," in Orlando, Florida on January 18-19, 1991. Gathered at the symp
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Color Recognition of Retroreflective Traffic Signs Under Various Lighting Conditions; How to Conduct Questionnaire Surveys; Technology Transfer and Its Tools; Statistical Shortcomings in Traffic Studies Part II
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