Federal Highway Administration’s Rural Technical Assistance Program; Modern Analytical Techniques Applied to Highway Materials Problems; A Strategic Transportation Research Study for Highway Safety; Pavement Performance Curves: Four Case Studies
Research was performed to determine total costs (construction and road user costs) and safety impacts associated with traffic control through work zones on rural four-lane, divided highways using single lane closure (SLC) versus two-lane, two-way traffic operations (TLTWO). An informational guide for use in selecting cost-effective traffic control
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The objectives of this study are to: (1) identify the root causes of rollover of vehicles in impacts with concrete safety shaped barriers, (2) determine the extent and severity of overturn collisions with concrete safety shaped barriers, and (3) identify potential countermeasures to reduce shaped concrete barrier rollovers. The study approach consi
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The study was designed (1) to discover whether steam distillation of asphalt takes place in a drum dryer mixer, (2) to compare changes induced by various laboratory conditioning (aging) techniques versus those occurring in drum dryer mixers, and (3) to identify possible differences in asphalts subjected to drum dryer mixing versus batch (pug mill)
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Volume II was essentially prepared as an Appendix of supporting information for Volume I. This volume contains much of the supporting theory and a summary of the research used to verify the design approach contained in Volume I, as well as general information concerning proprietary reinforced soil systems. The information provided in this volume is
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To ensure public safety and to protect the capital investment in bridges over water, underwater members must be inspected to the extent necessary to determine their structural condition with certainty. Underwater inspections must also include the streambed. In shallow water, underwater inspections may be accomplished visually or tactilely from abov
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Abstract Initial investigations of articulated concrete block revetment systems were performed as part of an overall study to examine methods of protecting earth embankments during overtopping flow. The results of the initial study are presented in Report No. FHWA-RD-88-181. The favorable performance of these earlier tests resulted in additional an
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This manual has been designed to provide individuals or organizations interested in roadside safety with the latest information concerning the concept, assembly and maintenance of the New Jersey Breakaway Sign Support System. This system was conceived and designed by the New Jersey Department of Transportation and has been in use in New Jersey sinc
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The objective of this in-house study was to determine if methylene chloride (CH2Cl2) can be used to recover asphalts using the Abson Method (AASHTO T 170 and ASTM D 1856), and to compare its effects on recovered binder properties to those of trichloroethylene (C2HCl3). Current nationally standardized test procedures (AASHTO and ASTM) do not allow m
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This report documents an investigation of seal coats, primarily chip seals. The study included a literature review, discussions with pavement technologists, interviews of State highway departments, and laboratory and field evaluations of selected projects. Significant findings and recommendations are as follows: • Construction factors are extremely
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This manual is concerned with the stability of rock slopes, with methods for assessing this stability and with techniques for improving the stability of slopes which are potentially hazardous. It is intended that it serve as both an instruction manual for engineers carrying out slope stability investigations and designing rock slopes, and a guide f
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This report offers highway engineers guidance in designing interchanges so as to reduce the likelihood of truck accidents on highway interchanges. This report summarizes research showing that the interaction between truck dynamics and interchange geometry can contribute to rollovers, jackknifes, and other loss-of-control accidents. Engineers can ap
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Current developments in truck design may worsen the problem of runaway trucks. Trucks are becoming heavier, and the design of more aerodynamic cabs and the use of radial and smaller-diameter tires may increase the potential for brake failure on downgrades. This report gives State transportation officials an overview of the Grade Severity Rating Sys
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To facilitate traffic flow and to improve highway safety on upgrades, highway design engineers have constructed hill-climbing lanes. A recent FHWA-sponsored study found that current guidelines may be leading designers to overdesign highways, adding and maintaining unnecessary hill-climbing lanes. The report summarized here highlights four major fin
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Changes in the 1982 Surface Transportation Assistance Act (STAA) allowing wider and longer trucks on the National Network have raised questions about highway safety. The Federal Highway Administration sponsored a study by Goodell-Grivas, Incorporated, that investigated the performance of trucks of various lengths and widths on roads with restrictiv
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Guidelines For Audible Pedestrian Signals; Load Equivalency: Issues for Further Research; Evaluation of Absorptive Sound Barrier Samples in Freeze/Thaw Environments; Changes Occurring in Asphalts During Drum-Dryer and Batch Mixing Operations
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