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.
This is Part II of a two-part final report on the evaluation of the physical properties and the use of expanded clay aggregate in bituminous hot mix construction. Part II of this final report is solely concerned with the measured skid resistance of the control and test sections over a 48-month period. The control and the test sections were construc
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A method of solving for the deflected shape of freely discontinuous plates and pavement slabs subjected to a variety of loads including transverse loads, in-plane forces, and externally applied couples is presented. The method is applicable to uniform and discontinuous plates and pavement slabs with freely-variable foundation support, including hol
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This is part I of a two part final report on expanded clay hot mix to: (1) evaluate the use of various expanded clay bituminous mixtures under high traffic counts, (2) accumulate through experience testing, suitable information on the physical properties of the expanded clay aggregates and mixtures, for recommending adequate testing and control pro
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Aviation occupations often require the performance of tasks under stressful conditions. Attempts to relate differences among individuals in performance under stress to personality variables have generally not been successful. Based upon responses to a fear of shock item in an attitude questionnaire describing numerous stressful situations, subjects
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Male subjects were tested after extensive training as two five-man 'crews' in an experiment designed to examine the effects of signal rate on the performance of a task involving the monitoring of a dynamic process. Performance was measured using three signal rates with several levels of workload induced by the simultaneous performance of different
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Air traffic controllers are required to spend considerable periods of time observing radar displays. Yet, information regarding physiological measures which best reflect the attentional process in complex vigilance tasks is generally lacking. As an initial approach to gaining such information, a number of physiological measures obtained during perf
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The development of effective concrete overlays and patches for repair of badly deteriorated reinforced concrete bridge decks will seek to: a. Determine an effective and practical treatment of a reinforced concrete deck in need of major repairs to enable it to receive, and to bond to, an overlay of concrete. b. Determine the mix proportions of portl
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The apparatus known as the Dynaflect has been used to measure a number of deflection basins on highway pavements throughout the country. The initial goal of this work was to determine the elastic parameters of the materials composing the highway structure using the results of these measurements. A method has been developed which is believed to be g
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The Shell vibrator has been used to investigate the behavior of a number of highway structures in the state of Texas. Measurements have been made of the wavelength at the free surface over a range of frequencies. It is found that the phase velocity of the wave is not constant but varies with the frequency. It is anticipated that the manner of the v
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Although the seat belt has been demonstrated to provide effective reduction of injuries and fatalities in automobile accidents by preventing ejection, a pattern of injuries directly attributable to impingement on the belt itself is becoming evident.This paper surveys the clinical evidence of restraint system injuries, discusses gross biomechanical
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X-ray diffraction data during adsorption of water vapor on Na- and Ca-montmorillonites show that interlayer expansion is continuous but nonuniform. X-ray and adsorption isotherm data indicate an ice-like configuration of water molecules is completed with the fourth layer of interlayer water for the Ca-clay; a fifth layer intrudes to give a less ord
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The report present some of the major findings, from a simulated study of statistical specifications, on three asphaltic concrete projects representing a total of approximately 30, 000 tons of hot mix. The major emphasis of the study has been on the assessment of reduced payment for non-conforming lots.The experience gained from this study indicated
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Considerable attention has been focused on the sophisticated restraint and ejection protection of rigidly selected occupants of military aircraft and manned space vehicles. However, the vast majority of occupants of military and both civil transport and general aviation aircraft, as well as the occupants of over eight million new automotive vehicle
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Both the inverted-Y yoke torso harness with inertia reel and the air- bag restraint system have had extensive independent development for some time by several engineering and research organizations for both aviation and ground vehicle occupant protection. The research reported in this paper consists of the first biomechanical primate evaluation of
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This report is concerned with the evaluation of alternative freeway merging control systems from a cost-effectiveness standpoint. Alternative systems that were evaluated include: 1) Analog Satellite System, 2) Digital Satellite System, and 3) Digital Central Control System. The report also provides a methodology for evaluating the cost-effectivenes
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Freeway surveillance and control have been used to improve traffic operation on and near the Gulf Freeway in Houston, Texas. Several research reports previously issued by the Texas Transportation Institute have investigated the nature and types of surveillance and control and have documented their effects on the Gulf Freeway. This report gives an e
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This report is intended to document the empirical equation for predicting pavement performance that was given in Section 3.3 of Research Report 32-11, "A Systems Approach to the Flexible Pavement Design Problem". The equation explains loss in serviceability in terms of deflections, axle applications, temperature, and foundation movements due to swe
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Texas Transportation Institute. Texas A&M University
1969-01-01
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This annotated bibliography on freeway control covers such areas as design, signals, automated control, ramps, merging, freeway accidents and the use of closed-circuit television and citizen band radio for traffic control. There are 81 citations.
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