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.
The broad objective of this project is to fully develop the use of the computer solution of the wave equation so that it may be used to predict driving stresses in piling and to estimate static load bearing capacity of piling from driving resistance records. This report should be considered as a supplement of Research Report Number 33-7. As stated
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The health and safety of more than 80,000,000 aircraft passengers, approximately 500,000 active civilian pilots and other civilian aviation personnel is the concern of the Federal Aviation Administration's Office of Aviation Medicine.
A model study was performed on a new type of energy dissipator for culvert flow. In this structure, the culvert flow drops along a steep chute, which ends at its intersection with the horizontal bottom of the stilling basin. As the flow impinges on the horizontal bottom, it is caused to spread rapidly, thus avoiding separation from the flared wingw
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The engineering behavior of soils and aggregates is a function of their basic properties and the environment to which they are subjected. In pavement design the effect of repeated loading is in· important environmental condition which has received little attention, especially for granular materials. This report present results showing the influence
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As a consequence of the high speeds of modern aircraft, pilots must respond quickly to signal lights from the ground or other aircraft during night flight. The present study was concerned with the relation of reaction time to flash luminance and duration. Reaction time was a decreasing, negatively accelerated function of flash luminance. Flash dura
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A method of solving for the deflected shapes of freely discontinuous orthotropic 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 plates and pavement slabs with freely-variable foundation support including holes in the subg
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Objectives of the Study are to: ( 1) Investigate the asphalt cements used by the Texas Highway Department, (2) Establish specifications to assure the use of superior asphalts by the Department, and (3) Determine how the durability of asphalt cements in service can be improved. This report describes an investigation which had as its objective the de
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The overall objective of the illumination research can be stated as follows: "The study of existing practices in continuous and safety lighting of highway facilities and the development of improved methods that will reduce glare, improve uniformity of illumination and offer greater safety to the highway users." Specifically, the objectives of the i
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Since 1964, TTI has been engaged in research on highway illumination with the Texas Highway Department in cooperation with the Bureau of Public Roads. Initially, this research was concerned only with the illumination aspect but the severity of collisions with lighting poles on Texas highways prompted the inclusion of a phase dealing with the impact
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A procedure, using the rate-of-creep method, is developed for predicting creep strains, camber, and prestress loss in pretensioned prestressed concrete highway bridge beams. The procedure uses shrinkage data and creep per psi data, both expressed as functions of time, developed from small concrete specimens. Non-loaded pretensioned prestressed ligh
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During 1965 there were 450,494 certificated general aviation pilots in the United States, of which 9,826 were over sixty years old. Within this group there were 108 accidents, 17 of which were fatal. Statistical analysis (chi square) revealed that these older pilots were essentially as safe as their younger colleagues. Analyses of accidents by airm
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An analysis of 1964 aircraft accidents, using type of airman certificate as a measure of pilot proficiency, is presented. Data show that student pilots generally have a better accident record than any other of the certification groups. Analysis confirmed that, as light and weather conditions deteriorated, accident rates increased. Also, as the high
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The purpose of this study is to provide the basic information necessary for the improvement of safety conditions at public rail-highway grade crossings in Texas. The primary objectives of this study are: 1.To compile a history of and analyze the nature and extent of accidents at Texas rail-highway grade crossings over the past few years. 2. To dete
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The Materials and Soils Section of the South Dakota Department of highways has been cognizant of the problems connected with design of road surfaces, through the highly expansive Pierre Shales for many years. During these years we have made changes in our methods of design and construction procedures which we believed would tend to reduce the expan
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This report concerns itself with an instrumented field test pile used to investigate the failure mechanisms which are developed in clay soils subjected to pile driving and foundation loadings. The ultimate load response of the pile-soil system was evaluated for both dynamic and static loadings. A test pile instrumented with pressure transducers, st
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The purpose of the study is to determine the economic changes caused by an Interstate Highway constructed in various types of local areas. The findings in each area, such as Huntsville, may be used in anticipating the economic effects of the Interstate Highway System upon comparable areas over the state.
The purpose of the studies was to measure the effects that construction of a segment of the Interstate Highway System has on local areas and communities by analyzing the changes in land value, land use, business activity, travel patterns, and other general community developments. The study of the Conroe area is one of nine studies conducted under t
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The objectives of the study were to: (1) Investigate the paving asphalts used by the Texas Highway Department (THD), (2) Establish specifications to assure use of superior asphalts by the THD, and (3) Determine how the durability of asphalt cements can be improved.
This research is concerned with ascertaining the value and effect of increased coded network detail on traffic assignment results. The Waco, Texas urban area (population of 132,000 during the O-D survey in 1964) was selected for use in the study, and three street system representations with greatly different degrees of detail were coded. Comparison
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