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.
Oregon Rockfall Hazard Rating System (RHRS) was field tested at over 50 locations statewide to determine where clarification and improvements to the system were needed. Field use of the system demonstrated many areas where refinements were valuable. These changes along with revised narratives explaining the various criteria have been incorporated i
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This report describes a study of motorist compliance with standard traffic controldevices. The research included a comprehensive review of past studies, contactswith traffic, law enforcement, and department of motor vehicles personnel, and ana?sessment of the viability of other information sources for identifying andquantifying motorist noncomplian
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The development of subterminal-satellite elevator systems has altered the traditional pattern of grain traffic in many rural areas of North Dakota and the Upper Great Plains. The impacts of these changes on the rural highway network have not previously been researched. The purpose of this dissertation is twofold: (1) to quantify the impacts of subt
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This report details the results of Mini Study 2. This Mini Study was conducted at the Federal Aviation Administration (FAA) Technical Center utilizing the Data Link test bed. Initial Data Link air traffic control services were evaluated under part task simulation conditions in order to identify service delivery methods which optimize controller acc
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This report details the results of Mini Study 2. This Mini Study was conducted at the Federal Aviation Administration (FAA) Technical Center utilizing the Data Link test bed. Initial Data Link air traffic control services were evaluated under part task simulation conditions in order to identify service delivery methods which optimize controller acc
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Many commonly occurring natural systems are modeled with mathematical experessions and exhibit a certain stability. The inherent stability of these equations allows them to serve as the basis for engineering predictions. More complex models, such as those for modeling traffic flow, lac stability and thus require considerable care when used as a bas
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Research has developed railing to withstand impact loads from vehicles of ever-increasing size; however aesthetic considerations have been overshadowed by safety and structural requirements. The objective of this research study was to develop aesthetically pleasing, structurally sound railings that can serve as alternative railings in city or urban
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The principal objectives of the study were to determine the following characteristics about special-use truck traffic: traffic patterns, vehicle axle distributions, axle load distributions, and radius of influence. The commodity movements which are considered in the study are: timber, produce, grain, beef cattle, limestone, and sand/gravel. Oil and
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The principal objectives of this study were to determine the following characteristics about special-use truck traffic: traffic patterns, vehicle axle distributions, axle load distributions, and radius of influence. The commodity movements which are considered in this study are: timber, produce, grain, beef cattle, limestone, and sand/gravel. Oil a
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Current trends in the design of diamond interchanges include several new configurations which are well suited to certain topographical and traffic demand constraints. Of these new types, it appears that the single point urban interchange (SPUI) has generated the most interest. This interim report summarizes the research conducted during the first y
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A Troxler 4640 thin layer nuclear gage was evaluated under field conditions to determine if it would provide improved accuracy of density measurements on asphalt overlays of 1-3/4 and 2 inches in thickness. Statistical analysis shows slightly improved accuracy resulting from the use of the Troxler 4640 gage compared to conventional gages. Other app
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In an earlier study at the Civil Aeromedical Institute, workloads were determined for passengers during an emergency evacuation. The evacuation tests were conducted in an orderly manner and were suggested as representative of a moderate workload. The current study is a continuation and amplification of that study and utilizes similar techniques for
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Numerous papers have been published on the phenomenon of stripping, especially on the possible causes of stripping, methods for predicting stripping potential of asphalt paving mixtures, and use of additives to minimize or prevent stripping. However, very few papers have evaluated this phenomenon considering the subsurface drainage in the total hig
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The purpose of this report is to provide guidelines for the planning and design of transit stations, stops, and terminals. These guidelines have been prepared form a market-based point of view. Design elements are suggested that directly relate promoting the success of development activities and transit services. The report discusses general develo
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Crash cushions have proven to be one of the most cost-beneficial life-saving devices on our nation's highways. However, all of the widely used designs utilize sacrificial, energy-absorbing materials. A significant maintenance effort, with associated costs, is necessary to restore these cushions after an impact. The purpose of the present research w
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A questionnaire was distributed to materials engineers in all 50 states and 3 FHWA Direct Federal Divisions. The report summarizes the responses from 47 states and 2 Direct Federal Districts concerning their use of polymerized asphalt emulsions for chip seals.
About an eight mile long section of Interstate 10 through McElroy Swamp in Ascension and St. James parishes have been undergoing excessive differential settlements for the past decade. The embankment was constructed by removing soft clay deposits of the fresh water swamp to the elevation of the underlying hard Pleistocene marine clay layer which is
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This report represents a study undertaken to determine the life cycle, load characteristics, and associated costs of a representative sample of the oldest rigid and flexible pavements designed in Louisiana (1963-1967) using the AASHO Guide for Design of Pavement Structures. Project selection resulted in a sampling of two classes of roads designed a
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A series of 55 light-airplane accidents was examined in an effort to demonstrate the role of seats in the genesis of injury in seat occupants. Good engineering, design of airplane seats is an important related issue which is not treated in this study. Case selection attempted to include only those events in which significant but not extreme acceler
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