The study tests by empirical comparative analysis the concept that tripmakers have a stable daily traveltime budget and discusses the implication of such a budget to transportation modeling techniques and the evaluation of alternative transportation systems. After verifying the stability of the traveltime budget for both macro and micro conditions,
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1974-05-01
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Nationwide Personal Transportation Survey (NPTS)
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PDF
The report presents data on automobile trips (one-way) and vehicle-miles of travel and trip length according to the four major trip purposes for which the trip was made: earning a living, family business, educational, civic and religious, and social and recreational. The first part of the report discusses trip purpose as related to population size-
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The objective was to obtain data needed to reach rational decisions regarding state regulations so that wide-load movements can be made as safely as possible, without undue economic burdens to the purchasers of such homes, to the states, or to other users of the highways. The project included extensive photographic and visual observations of vehicu
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The objective was to obtain data needed to reach rational decisions regarding state regulations so that wide-load movements can be made as safely as possible, without undue economic burdens to the purchasers of such homes, to the states, or to other users of the highways. The project included extensive photographic and visual observations of vehicu
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Similar mineralogy and textures exist in the basaltic rock studied from four quarries in the Nestucca River area of northwestern Oregon. However, durability of the aggregates manufactured from these quarries differs greatly. This study, done by petrographic and X-ray analysis shows that no new minerals form during degradation. Existing delays such
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This report provides scheduling, cost and resource control, and information handling convenience for individual and multi-project scheduling; but it does not design a network, or plan out a project. PMS functions as a handler, computer selector, and displayer of information which will increase the abilities of the project planner. This report inclu
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A New System for Inspecting Steel Bridges for Fatigue Cracks; Improvements in the Rapid Analysis of Portland Cement by Atomic Absorption Spectrophotometry; Environmental Research and Highways; Major Interchange Design, Operation and Traffic Control Summary of Results; Rest Areas; Review of Report of Noise Levels Associated with Plant Mix Seals
This work was undertaken to ascertain the feasibility of using organic coatings, especially epoxies, to protect the steel reinforcing bars embedded in concrete of bridge decks from rapid corrosion. This corrosion is caused by the chloride ions from the most commonly applied deicing salts, sodium chloride, and calcium chloride. Altogether, 47 differ
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Efforts to improve pavement skid resistance have shown the advantages of using open-graded asphalt paving mixtures. Extensive implementation of these mixtures has been hampered, however, due to some difficulties encountered during construction and some deficiencies observed in service performance. These problems are partially attributable to a numb
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The objective of this effort was to complete the development of the computer simulation model SCOT (Simulation of Corridor Traffic) designed to represent traffic flow on an urban grid-freeway integrated highway system by simulating an existing system. This report describes the status of the calibration, validation, evaluation, and application studi
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The traffic-density buildup following a lane blockage on a four-lane freeway carrying low-density traffic is determined for several different densities (0.0065, 0.0100, and 0.0106 vehicles per foot) characterizing the freeway. The time for the traffic to return to normal after the blockage is removed is also caluclated. The traffic-density buildup
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Data on fatal and nonfatal injuries in motor vehicle traffic accidents for calendar year 1974 are summarized by highway system in the tables which follow. These tables, compiled from reports submitted to the Federal Highway Administration by the 50 States and the District of Columbia as of November 1975, include data for all roads and streets in th
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