This technical sharing report presents the summary of a pile group prediction symposium held on June 17 and 18, 198 6 at the University of Maryland campus. Eleven foundation experts representing consulting firms, universities, and Federal and State transportation agencies presented their predictions on the results of single and pile group tests in
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This study was intended to quantify the benefits and costs resulting from lane widening, shoulder widening, shoulder surfacing, sideslope flattening, and roadside improvements. Detailed traffic, accident, and roadway data were collected on 4,951 miles of two-lane roads in seven states. An accident predictive model and statistical tests were used to
Since publication in 1980 of FHWA's manual entitled, Development of Priority Accesible Networks: an Implementation Manual - Provisions for the Elderly Handicapped Pedestrians, Federal rules and standards have been updated and revised. Cities across the country have also been building up their own body of knowledge by testing and evaluating accessib
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A long term study of the settlement performance of 21 bridge foundations supported on cohesionless soil sand or silt was completed to provide a reliable database for engineering evaluation. The observations documented the successful performance of the foundations where total average settlement of 0.75 In was recorded while an average of only 0.25 I
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This report presents the results of a 30 month investigation at Lehigh university during which an FHWA WIM system was redesigned and used to acquire and process simultaneous truck weight plus bridge response data from 19,402 trucks crossing 4 inservice bridges in Pennsylvania. The new system is designated the wim+ response system in the report. The
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The overall objectives of this research were to (1) identify through laboratory testing, the most promising types of additives or admixtures for reducing rutting and cracking in hot mixed asphalt pavements, (2) develop guidelines showing how the additives can be incorporated into actual pavements and (3) develop procedures for evaluating additives.
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This project was designed to increase the reliability, integrity and mechanical behavior of electroslag welds in type A36 and A588 steel alloys. The parameters developed in this program utilized a narrow gap and a consumable plate guide tube in combination with reduced voltages and higher welding currents. This reduced heat input, increased welding
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The overall objectives of this research were to (l ) identify through laboratory testing, the most promising types of additives or admixtures for reducing rutting and cracking in hot-mixed asphalt pavements, (2) develop guidelines showing how the additives can be incorporated into actual pavements and (3) develop procedures for evaluating additives
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This document presents the results of a study and experimental work to determine the potential benefits of using high strength (10,000 psi compressive strength) concrete for highway bridge construction. Current knowledge and applications of high strength concrete are reviewed and related to use with the MSHIO bridge specifications. Conceptual desig
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This technical sharing report presents the summary of a pile group prediction symposium held on June 17 and 18, 1986 at the University of Maryland campus. Eleven foundation experts representing consulting firms, universities, and Federal and State transportation agencies presented their predictions on the results of single and pile group tests in s
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Recycling processes can be categorized according to material type - asphalt surface recycling, cold-mix asphalt recycling, hot-mix asphalt recycling, and portland cement concrete recycling; or according to procedural type - surface recycling, in-place recycling and central plant recycling. If the project can be restored by making corrections to the
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Improving the Visibility of Railroad-Highway Grade Crossing Signals; Advisory (Expert) Systems: An Assessment of Opportunities in the Federal Highway Administration; The Potential Impact of Automobile Headlamp Changes on the Visibility of Reflectorized Overhead Highway Guide Signs; Luminance Requirements for Signs with Complex Backgrounds
United States. Department of Transportation. Federal Highway Administration. Office of Motor Carriers
1987-09-01
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This publication represents the 1985 compilation of accident reports submitted to the federal highway Administration's Office of Motor Carriers (OMC) by motor carriers of property in interstate or foreign commerce. These accident reports are a vital source of information upon which the OMC relies in administering its regulatory and enforcement resp
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The U.S. Accelerated Loading Facility (ALF), a full-scale accelerated pavement testing machine. has been installed at the Pavement Testing facility (PTF) at the Turner-Fairbank Highway Research Center (TFHRC). The report describes the design and construction of the two PTF test pavements, the materials used in their construction. and the associated
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This report documents the full-scale side impact test of a 1980 Plymouth Champ impacting into a breakaway luminaire support. The impact speed was 30 mph and the impact angle was broadside with the impact point aligned with the driver's shoulder. The impacted pole was a slip-base-mounted steel unit with mast arm and luminaire. Although the pole did
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This research was conducted to identify and investigate aspects of NCHRP Report 230 which require additional technical research. This report deals with five broad areas of concern: (1) the importance and effect of soil conditions on the dynamic performance of barriers, (2) methods for re-evaluating pre-Report 230 test results in light of the curren
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