The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations.
Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.
Three materials that offered the potential of minimizing reflection cracks were installed. Two of the materials were high tensile strength fabrics and the third was an emulsified rubber compound. The applications were made over a badly cracked bituminous pavement just north of Charlottesville.
The purpose of this survey was to aid the writer in understanding and retaining material in preparation for a project on the industrialization of bridge construction. However, it was believed that the results of the survey would be informative to other persons interested in industrialized bridge construction.
The design method for secondary roads is based on AASHO Road Test Results and Virginia's design experience. It is divided into two parts. (1) the evaluation of the soil support value of the subgrade, the thickness equivalencies of the paving materials, and the traffic in terms of vehicles per day; and (2) design considerations such as the determina
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An investigation was initiated in the spring of 1972 to develop surface mixes with high skid resistance for use at special locations. The porous friction course will hopefully provide high skid coefficients where water drainage and hydroplaning may be problems. The porous friction course has sufficient voids and channels to allow water to drain to
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This study was initiated to determine the correct moisture calibration curves for different nuclear gages. It was found that the Troxler Model 227 had a linear response between count ratio and moisture content. Also, the two calibration curves for this gage were best divided by the optimum moisture content of the soil. The separation value of optim
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The correlation between asphaltic concrete tensile stiffness and fatigue life was determined in the laboratory. Constant strain fatigue tests were utilized and indirect tensile tests were selected because of their simplicity and applicability. Four asphaltic concrete mixes of different stiffnesses were tested under constant strain fatigue and indir
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It is generally recognized that the volume and geometry of included pores within a mineral aggregate have a significant effect on the physical and chemical behavior of the aggregate when used as a structural material. However due to the technical difficulties involved in measuring pore parameters, accurate correlation of field behavior with pore ch
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The use of a weak sandwich layer in a four-layer system is common in the construction of flexible pavements, but the use of a sandwich layer in a three-layer system is in the experimental stage in Virginia. Theoretical and field studies have been carried out to determine how sandwiched layers affect the design and performance of pavement systems. I
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Currently the sanctions applicable to traffic violations emphasize a punitive approach, premised on the assumption that the violation is the result of deliberate risk taking or, at the least, avoidable carelessness, for which punishment will serve as a deterrent to repetitions. This characterization of the traffic offender tends to ignore the compl
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Fifty-four judges were interviewed and at least one judge in each of the forty judicial circuits was questioned. Some of the observations on the present procedure were as follows: (1) a substantial number of judges were dissatisfied with the procedure, (2) a majority of the judges believed that the commissioners based their awards on considerations
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Of late, in the early stages of highway planning, consideration has been given the potential noncompensable losses or social costs of relocating people displaced by highway construction. Instead of being concerned merely with the dollars and cents costs of highway construction, engineers and highway planners are now also considering the social and
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This project was designed to test both the short-term (through the use of standardized tests) and long-term (by an analysis of subsequent driving records) effects of small group interaction sessions on the driving attitudes and behavior of high school students learning to drive. Two classes of high school students were randomly selected. Each was s
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Based on the review of previous Council reports, a strategy for the use and control of potentially reactive carbonate rocks is discussed in this report, which lists the previous reports in a bibliography. Specifically, this report discusses an evaluation of four test methods using a suite of 22 rocks exhibiting a wide range of potential expansion a
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A new approach to the investigation of aviation accidents has recently been initiated, utilizing a follow-on to the psychological autopsy. This approach, the psychosocial reconstruction inventory, enables the development of a dynamic, retrospective portrait of the pilot-in-command subsequent to an accident.Twelve fatal general aviation accidents we
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Two hundred and twenty-nine air traffic controller trainees were tested on the CAMI Multiple Task Performance Battery. The battery provides objective measures of monitoring, arithmetical skills, visual discrimination, and group problem solving. The criterion of trainee potential was based on ratings from FAA Academy instructors in courses being att
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Sixteen instrument-rated pilots, eight of whom were very experienced professional aviators, flew instrument landing system approaches in a Cessna 172 under simulated instrument flight conditions while sober and while under the influence of 40, 80, and 120 mg% of blood ethyl alcohol. Each pilot flew four approaches to minimums on each of two occasio
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