The development and testing of incident detection algorithms was based on Los Angeles and Minneapolis freeway surveillance data. Algorithms considered were based on times series and pattern recognition techniques. Attention was given to the effects of geometrics, sensor configuration and weather, and methods were developed for detecting malfunction
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This report provides current information and design guidelines on cut-and-cover tunneling for practicing engineers. The main emphasis is on the geotechnical aspects of engineering. Included in this volume is a state-of-the-art summary of displacements and lateral pressure. Other topics are basic concepts of soil mechanics, ground water in open cut,
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Recommends improved designs for further research. Emphasis is upon developing procedures to understand and control displacements adjacent to deep excavations. Concepts include both analytical procedures and construction techniques. Suggested methods to improve performance are' (1) Use of stiff walls and pressurized wells in cohesive soil; (2) Preve
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The development and testing of incident detection algorithms was based upon freeway surveillance data obtained from Los Angeles and Minneapolis. In the instance of Los Angeles data, data were in the form of samples of the sensor presence pulses fifteen times per second. For purposes of this study, these data were aggregated in the form of twenty-se
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This report describes and evaluates alternative travel survey procedures that have been used for or are potentially applicable to statewide transportation planning. The types of survey procedures discussed in the report include household, roadside, and modal passenger survey techniques. The potential uses, strengths, and weaknesses of each type of
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This report presents results achieved during the first year's effort to determine performance requirements and capabilities of heavily trafficked conventional pavements to provide zero-maintenance performance. Five types of pavements are under consideration in this study: plain jointed concrete, reinforced jointed concrete, continuously reinforced
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The purpose of this investigation is to provide administrators and designers with factual data on which to base decisions on the type of protection to provide to bridge decks constructed in corrosive environments. Specifically, the objective is to determine the relative time-to-corrosion of reinforcing steel embedded in concrete slabs, fabricated f
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The determination of the shape and characteristics of a backwater profile in a closed conduit is generally a lengthy and tedious procedure without the use of a computer. Utilizing the charts and tables of this publication and a few simple calculations, it is possible to completely define an M2 profile in a circular structural plate corrugated metal
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This report provides current information and design guidelines on cut-and-cover tunneling for practicing engineers. The main emphasis is on the geotechnical aspects of engineering. Included in this volume is a state-of-the-art summary of displacements and lateral pressure. Other topics are basic concepts of soil mechanics, ground water in open cut,
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The purpose of this review was to measure the effects of No. 57 coarse aggregate gradation and segregation on the cement efficiency as measured by workability and quality in Portland Cement Concrete.
The main objective of this study is to develop an accurate design method for computing inlet hydrographs of surface runoff, with average recurrence intervals of 10, 25, and 50 years, from typical urban highway by flood routing technique. The boundary-value problem of one-dimensional infiltration resulting from rainfall is formulated and solved nume
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The main objective of this study is to develop an accurate design method for computing inlet hydrographs of surface runoff, with average recurrence intervals of 10, 25, and 50 years, from typical urban highway by flood routing technique. The most comprehensive mathematical model based on the method of characteristics was developed for computing the
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The main objective of this study is to develop an accurate design method for computing inlet hydrographs of surface runoff, with average recurrence intervals of 10, 25, and 50 years, from typical urban highway by flood routing technique. Knowledge of the time distribution of rainfall in heavy storms constitutes a basis for the design of an urban st
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The main objective of this study is to develop an accurate design method for computing inlet hydrographs of surface runoff, with average recurrence intervals of 10, 25, and 50 years, from typical urban highway by flood routing technique. Resistance to sheet flows over natural turf surfaces is experimentally investigated. The formulation of a functi
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The main objective of this study is to develop an accurate design method for computing inlet hydrographs of surface runoff, with average recurrence intervals of 10, 25, and 50 years, from typical urban highway by flood routing technique. Hydrologic data such as the rainfall intensity, runoff flow rate, air temperature, wind velocity, and soil moist
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This is Volume 2 of a two-volume report of the results of a detailed sensitivity analysis for the FHWA flexible pavement structure model VESYS IIM. Procedures were developed and applied for conducting a sensitivity analysis for the rather complex VESYS IIM that had 30 independent variables. As a full factorial consideration at only two levels would
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Highways and the Bioenvironment; The Bridge Deck Problem—An Analysis of Potential Solutions; Road Roughness Measurement and Its Applications; A New Approach to Pavement Design; Does Voltage Measurement Detect Salt Corrosion of Concrete Reinforcing Steel?; Highway Design for Motor Vehicles—A Historical Review Part 5: The Dynamics of Highway Curvatur
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A series of reports have been written to document revised and updated versions of the simulation of highway-vehicle-object interactions in a single vehicle highway environment. The programs documented were developed under FHWA sponsorship to provide the highway safety community with an analytical means of evaluating the effects of highway/roadside
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