The objectives of this research project were to develop improved design procedures and guidelines for major (i.e., freeway-to-freeway) interchanges through the examination and analysis of existing design procedures and current freeway operational characteristics. Pertinent information was gathered through a review of the literature, conversations w
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Reliable estimates of vehicle-miles of travel (VMT) on each highway system within a State continue to be required for many purposes. Traffic data provide a basis for producing independent estimates of vehicle-miles on the major highway systems in a State. The reliability of State estimates of vehicle-miles (VMT) has become increasingly important in
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The theory of traffic flow following a lane blockage on a multi-lane freeway has been developed. Numerical results have been obtained and are presented both for the steady state case where the traffic density remains constant and the non-steady state case where the traffic density changes with time.
1973-04-01
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Nationwide Personal Transportation Survey (NPTS)
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Motor-vehicle drivers are examined within three parameters: (1) geographic distribution; (2) population distribution of licensed drivers by age-groups and sex; and (3) travel distribution of licensed drivers by age-groups, sex and estimated annual miles of driving.
A rapid method for analysis of Portland cement is given using atomic absorption spectrophotometry (AA), in which either reagent standards or standard cements may be used for calibration purposes. A novel feature of the method is that means are provided for the determination of silica in the same solution as other constituents without further steps
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Status of Concrete-Polymer Composites in the United States and Abroad; Strength Development and Reaction Products in Lime-Montmorillonite-Water Systems; Effects of Dolomitic and Calcific Limes on Strength Development in Mixtures with Two Clay Minerals; Design of Continuous Curved Bridges
United States. Department of Transportation. Federal Highway Administration. Offices of Research and Development
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1973-01-01
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This study of cut-and-cover tunneling techniques in urban areas considers environmental quality, geotechnical investigation and analysis, ground support, ground water control, permanent structure, restoration, cost considerations and major problems. Both United States and Foreign techniques are reviewed. This volume consists of summaries of signifi
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This report provides basic information for 1973 from each State on road-user taxes and property taxes levied on a selected group of vehicles. The intent is neither to weigh the merits of any of the taxes being reviewed nor to recommend any tax policy, but to supply the means to measure and compare the annual payments that would be made for each of
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