Design criteria and a design method for pavement subsurface drainage systems include inflow-outflow method of analysis, open graded drainage layers, collector drains, pipe outlets and markers. Design examples are given for embankment sections, cut sections and superelevated curves. Emphasis is on draining water that infiltrates the pavement structu
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Migration of Lime in Compacted Soil; Some Factors Affecting Reception and Use of Information by Drivers; Demonstration Projects: Bridging the Gap Between Research and Operations; Prestressed Concrete Pavement Demonstration at Dulles International Airport; Characteristics of Rural and Urban Fatal Accidents on the Interstate Highway System, 1967-70;
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A catalog of steels used in highway bridge construction has been developed. A state-of-the-art survey on the stress-corrosion susceptibility of these steels has been conducted. The types and concentrations of corrosives that can be experienced in the highway environment have been established.
1972-04-01
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Nationwide Personal Transportation Survey (NPTS)
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PDF
The report presents automobile occupancy rates by major purposes of the trip, as well as place of residence of principal driver of the automobile, day of the week, length of trip and by time of day by hour that the trip was started.
1972-04-01
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Nationwide Personal Transportation Survey (NPTS)
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PDF
Seasonal patterns of automobile trips and vehicle-miles of travel are examined within four selected parameters: (1) place of residence; (2) purpose of trip; (3) length of trip; and (4) day of the week that the trip was started.
1972-04-01
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Nationwide Personal Transportation Survey (NPTS)
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PDF
The report presents the effect of seven selected variables on automobile use expressed in average annual miles per vehicle. These seven variables were: number of cars in household, age of automobile by year-model, cars purchased new or used, annual income of household, occupation of principal driver and place of residence.
The basic manual, published as the first volume of this report, is intended for use as a tool in predicting noise levels which will be generated by freely-flowing vehicle traffic along a highway of known characteristics. The first volume explains the basis for the computerized prediction model, used for highway noise level prediction, and contains
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United States. Federal Highway Administration. Office of Highway Planning
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1972-02-01
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PDF
The need for better information systems in highway administration has become increasingly evident over the past few years. With sophisticated computer equipment being used more and more by highway engineers, opportunities exist for the development of better information systems in several highway department functions, including highway planning, saf
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