United States. Federal Highway Administration. Program Management Division
1979-06-01
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Proper planning for highway improvement programs requires that alternative improvement strategies be evaluated in terms of the performance and benefits expected to be received relative to the amount of capital expenditures proposed. This is important at the national level as well as at the State and local levels. Capital improvement cost data is a
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United States. Department of Transportation. Federal Highway Administration
1979-05-01
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The Wheel Force Transducer was developed for the Federal Highway Administration under Contract DOT-FH-11-9437 for dynamic measurement of vertical, longitudinal and transverse truck wheel loads. Modification No. Two (2) to the development contract required that a limited static calibration and a functional dynamic test of the transducer be completed
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The highway construction industry is changing rapidly. With most of the interstate systems completed, the scope of work is now focusing on maintaining the existing systems. Because of the differential time between beginning and completion, many sections are approaching the end of their original design life. Some of these have already had maintenanc
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This report describes modifications to the TSC MOD-04 highway traffic noise prediction program to extend the scope of problem formulation. The FHWA Level 2 Highway Traffic Noise Prediction Model features: Revised Vehicle Reference Noise Emission Levels; Specification of Site-Specific (Excess) Attenuation; English/Metric and Metric/English Conversio
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The report reviews an experiment undertaken to examine the relative effectiveness of roadside signs and vehicle markings for warning motorists of the presence of a slow moving vehicle on the road ahead in a rural two lane situation. In the experiment a staged slow moving vehicle was introduced into the traffic stream, and data were taken on the rea
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The results of laboratory experiments on scour around circular piers in cohesionless bed material at high Froude numbers, F, up to 1.5 are presented. The scour depths in sediment transport regime (F>F⌄C) first slightly decreases and then increases with the increase in the Froude number. A formula to predict the scour depth at Froude numbers (F-F⌄C)
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The report presents the findings and conclusions of a study to develop an experimental design and analysis plan for field testing and evaluation of the accident reduction potential of a proposed new railroad grade crossing advance warning sign. Several alternative sampling frameworks were initially developed to determine which might offer the most
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Debris causes hydraulic problems. at highway bridges nationwide. The problems are the greatest in the Pacific Northwest and the upper and lower Mississippi River Valley. Debris hazards are local and infrequent phenomena often associated with· large floods. Most bridge destruction is due to accumulation against bridge components. Debris may partiall
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This manual provides standardized identification of distress types associated with four types of conventional highway pavements. These include: jointed plain concrete, jointed reinforced concrete, continuously reinforced concrete, asphalt surfaced with granular or stabilized base and asphalt overlays over portland cement concrete. Each distress typ
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Solving the Mysteries of Pavement Deflections With “Thumper”; Railroad Grade Crossing Passive Signing Study—Phase 2; Debris Problems in the River Environment; Emergency Escape Ramps for Runaway Heavy Vehicles; The CMD: A Device for Continuous Monitoring of the Consolidation of Plastic Concrete
The primary objective of this project was to demonstrate the feasibility of constructing a bituminous pavement by the hot recycling process. Secondary to that was the evaluation of the construction procedure and the finished pavement. The purpose of this improvement was to restore the outside bituminous surfaced shoulders to a like-new condition.
Priority treatments for high-occupancy vehicles (HOV) can introduce new safety problems due to operational or geometric modifications. At the same time, they can reduce the accident potential by improving overall traffic operations. The research focused on five major areas of HOV projects: 1) an examination of the pertinent accident rates, 2) an an
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After some success in the process of recycling asphalt pavements in 1975, Kossuth County decided to implement further recycling projects on a larger scale in its 1976 road construction program. The work done in 1975 indicated that a quality product could be produced, but that an air pollution problem created during the heating and mixing operation
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This report describes a project in which approximately 6,200 tons (5,630 Mg) of asphaltic concrete were recycled through a conventional asphalt batch plant. During the construction of the project, a buildup of asphalt-coated fines occurred in the dryer and the dust collector. The buildup is thought to have been associated with the fineness and/or t
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