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 report describes a research effort directed toward finding a means for detecting delamination, one of the more serious forms of deterioration found in concrete bridge decks. It describes (a) one of the methods employed for delamination detection, (b) the development of the basic components required for automatic detection, and (c) the complete
...
Material properties in the uniaxial tension and compression modes were obtained for two compacted asphaltic concrete mixtures for various temperatures and rates of loading. The first mixture was preheated and compacted at 300°F whereas the second mixture was processed at 450°F; thus, the embrittlement due to overheating with the compactive effort c
...
This paper represents the first in a series which will provide conversion data to transform cholinesterase activity units obtained by one method into the corresponding units of another.
This work describes a discrete-element method for the dynamic analysis of plates or slabs on nonlinear foundations. The method has been programmed for a high-speed digital computer and can be used to obtain solutions to a wide variety of plate vibration problems. A step-by-step numerical integration procedure is employed to numerically integrate th
...
An examination of the state of knowledge was conducted for the purpose of evaluating methods of providing the urban freeway driver with real-time traffic information. Visual and audio methods of communication were considered to be most feasible for implementation. The state of the art was therefore focused on systems requiring the use of these two
...
Ramp metering has proven to be an effective means of improving the operational efficiency of an over-crowded urban freeway. Freeway control systems can now prevent a breakdown under "normal" conditions. However, adequate control of demand under "abnormal" conditions, such as accidents or lane blockages, is not possible. Real-time driver communicati
...
This report describes the results of a field inspection and load test of three prestressed concrete highway bridges which have a prestressed panel subdeck. The panels, which are precast and pretensioned, span from beam-to-beam and serve as the bottom form for a cast-in place concrete deck. The bridges examined were located in Grayson County, Texas,
...
This report contains the results of a short term study of a pile in tension loads. The piles tested were driven on Louisiana Department of Highway's property in response to preceding research work entitled "Stability of Slender Prestressed Concrete Piling" by Professor H. Turner of Louisiana State University. When a depress roadway was to be built
...
The data presented in the paper suggest that aerial applicator personnel exposed to endrin may be subject to two hitherto underfined toxic risks:1.sensory disturbances which may appear after acute exposure at doses too low to produce tremors and other gross signs of posioning;2.under some circumstances, endrin stored in body fat may be released in
...
Long-associated with transportation ('railroad nystagmus'), optokinetic (OPK) nystagmus is an eye-movement reaction which occurs when a series of moving objects crosses the visual field or when an observer moves past a series of objects. Similar continual movement of the eyes (and head) has been reported to produce an undesired occupational nystagm
...
The Supersonic Transport represents a quantum step in civil aeronautics. It will cruise at altitudes having low ambient gaseous pressures far exceeding human capacities for compensatory respiration. In consideration of this evolutionary step, tentative airworthiness standards with respect to SST pressurization capabilities in the event of depressur
...
The issuing scrip system allows drivers to issue, in lieu of change, redeemable coupons to passengers boarding with coins or bills in excess of the local or interline fares; the amount of money received from the passenger is deposited into a securely locked box which cannot be opened by the driver. The scrip system was tested both during the daytim
...
The role of macro-texture in imparting friction capabilities to pavement surfaces is of major concern to researchers. Macro-texture is but one of the many variables affecting the interaction at the tire-pavement interface; however, at present its relative importance is questioned. Friction tests obtained at 20, 40, and 60 mph with the Texas Highway
...
Friction tests at 20, 40, 60, and 80 mph, on wet and dry surfaces using smooth and treaded tires, with 10 and 24 psi tire inflation pressures were taken with a Mu-Meter and the Texas Highway Department research skid trailer. Fifteen pavement surfaces which exhibited widely different friction levels, friction-velocity gradients, drainage capabilitie
...
To gain information on the appropriate temperature to obtain a given desirable viscosity for the various asphalt cements commonly used in Oregon, viscosities were determined at three or more temperatures near the mixing temperature. From the values determined by test, a plot of log-log viscosity vs. log absolute temperature can be used to predict t
...
This report is the result of a three phase research program in which cements and aggregates from various supplier were studied in an effort to evaluate and improve various constitutents in concrete mixes. The major emphasis of this study has been on the classification of cements when used in concrete mixes, and finally, the potential reactivity of
...
This project was undertaken to establish a thin bituminous surface course that would possess good skid resistant qualities as well as, being both economical and durable.This is the final report on the evaluation of skid resistant surfaces which was conducted by the Louisiana Department of Highways in cooperation with the Bureau of Public Roads.The
...
The Research and Development Section of the Louisiana Department of Highways has been using a PCA Road Meter to gather information concerning Present Serviceability Indices for the AASHO Correlation Study. the PCA Road Meter has replaced the Chloe Profilometer because the Chole Profilometer had proven undesirable for this purpose for several reason
...
This policy covers initial placement, adjustment, relocation andreplacement of utility facilities in, on, above or below all highwayright·of way over:Wnicn tneiowa.~state :Hig'hway·commission exercisescontrol of access. It embodies the basic !:)Pecifications and standardsneeded, to insure the safety of the highway user and the integrity ofthe. high
...
The bridge deck survey herein reported was based on a stratified random sample of bridges. The primary strata were in 25 Texas Highway Department districts; while, within each district, stratification was based on age and/or type of structure. Bridges within the secondary strata were randomly selected at a rate of 20 percent. This ensured an adequa
...
Links with this icon indicate that you are leaving a Bureau of Transportation
Statistics (BTS)/National Transportation Library (NTL)
Web-based service.
Thank you for visiting.
You are about to access a non-government link outside of
the U.S. Department of Transportation's National
Transportation Library.
Please note: While links to Web sites outside of DOT are
offered for your convenience, when you exit DOT Web sites,
Federal privacy policy and Section 508 of the Rehabilitation
Act (accessibility requirements) no longer apply. In
addition, DOT does not attest to the accuracy, relevance,
timeliness or completeness of information provided by linked
sites. Linking to a Web site does not constitute an
endorsement by DOT of the sponsors of the site or the
products presented on the site. For more information, please
view DOT's Web site linking policy.
To get back to the page you were previously viewing, click
your Cancel button.