Each year U.S. highway agencies spend millions of dollars in maintaining highway embankments, slopes, and other earth structures as well as removing rock falls and soil debris from roadways and repairing landslides. Activities from maintaining highway slopes and restoring landslides often cause traffic slow down and stoppage that creates serious sa
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This report documents the pavement performance of two test sections at FHWA's Pavement Testing Facility. The traffic loading of the test asphalt concrete pavements was achieved by using the Accelerated Loading Facility (ALF). Field performance data consisting of longitudinal profile, rutting, cracking, and deflection were collected at the facility.
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To the motoring public, potholes are one of the most visible and annoying forms of pavement distress. Most pothole repairs made during the winter months are short-lived. Potholes that must be filled repeatedly are expensive to repair. One reason for the short life of repairs done during the winter is that the commonly used repair mixtures cannot wi
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Utility Poles—A Highway Safety Problem; FHWA High Priority National Safety Research Program; Modified Railroad-Highway Grade Crossing Pavement Marking and Crossbuck Study; The Marketing of New Highway Research Products—A Difficult Process
United States. Federal Highway Administration. Bridge Division
1988-12-01
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The Recording and Coding Guide for the Structure Inventory and Appraisal of the Nation's Bridges, hereafter referred to as the Guide, has been revised several times in the past. This latest edition revises the Guide to provide more thorough and detailed guidance in evaluating and coding specific bridge data. Several items collected previously have
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The purpose of the study is to examine changes to size and weight limits in order to determine their effects on the designs and configurations of heavy vehicles, the performance capabilities of the resulting vehicles, and the ensuing safety implications thereof. The technical report provides results and findings from an analytical investigation of
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Expert Systems are computer programs designed to include a simulation of the reasoning and decision-making processes of human experts. This report provides a set of general guidelines for the development and distribution of highway related expert systems. This expands the guidelines provided in Chapter X, Expert Systems, of the Information Resource
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This project report, in six volumes, documents a system of computer programs oriented to the design of drainage components: culverts, storm drains, and open channels. The system includes an input generator to estimate design rain, hyetographs, design flow and hydrographs at user selected return periods. Programs are facilitated with semi-expert sys
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This project report, in six volumes, documents a system of computer programs oriented to the design of drainage components: culverts, storm drains, and open channels. The system includes an input generator to estimate design rain, hyetographs, design flow and hydrographs at user selected return periods. Programs are facilitated with semi-expert sys
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This project report, in six volumes, documents a system of computer programs oriented to the design of drainage components: culverts, storm drains, and open channels. The system includes an input generator to estimate design rain, hyetographs, design flow and hydrographs at user selected return periods. Programs are facilitated with semi-expert sys
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This project report, in six volumes, documents a system of computer programs oriented to the design of drainage components: culverts, storm drains, and open channels. The system includes an input generator to estimate design rain, hyetographs, design flow and hydrographs at user selected return periods. Programs are facilitated with semi-expert sys
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The hydraulic and erosional characteristics of overtopping flow are examined. Methods of protecting earth embankments of dams, levees, and roadways from damage during overtopping flow are investigated. Nineteen full-scale tests of bare earth embankments (unprotected) were conducted to derive baseline erosion rate relationships. Thirty-eight full-sc
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United States. Department of Transportation. Federal Highway Administration
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1988-09-01
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PDF
Over the past 15 years, Federal legislation, Executive Orders, and subsequent regulation have caused major changes in many aspects of environmental protection. One important change 1s the now commonplace requirement for agency and public interaction in the decisions leading to government-sponsored projects affecting the environment. Interaction is
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United States. Federal Highway Administration. Bridge Division
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1988-09-01
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PDF
Field demonstrations for Demonstration Project 66, Design and Construction of Driven Pile Foundations, include: (1) Dynamic pile monitoring by pile analyzer (field computer); and (2) Static pile load testing using a mobile pile load testing frame. The equipment and technical assistance are made available to requesting State highway departments and
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Previous FHWA research on pedestrian exposure identified four problem areas as promising candidates for accident reduction: intersections without marked pedestrian crosswalks, major arterial streets, local streets, and locations lacking sidewalks or pedestrian pathways. This report describes the results of a project undertaken to examine those four
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Eighteen relatively large reinforced concrete slabs were fabricated in 1980 using 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 bottom mat of reinforcing steel in chloride-free concrete, and a
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