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 Federal Highway Administration has produced a Highway Performance Monitoring System Field Manual as a guideline for the individual states. The Field Manual includes an Appendix J which describes the proper calibration and reporting procedures for pavement roughness monitoring. The individual states are required to calibrate all roughness instru
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The purpose of this study, which is published in five volumes, was to identify and verify using all available state-of-the-art sources, how ground tire rubber can be utilized in asphalt concrete mixtures for pavement construction meeting standard quality performance related specifications. The project was initiated by the Florida Department of Tran
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Proponents of short line railroad development hypothesize that rail traffic volumes may increase under short line ownership as a result of better service to shippers. The objective of this paper is to assess the potential effects that short line operations may have upon the level of rail services received by grain shippers on light density rail lin
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The primary objectives of this study were to provide the data: (1)to update the trip generation rates used in the Maricopa Association of Governments (MAG) travel demand forecasting process, and; (2) to validate the MAG trip distribution model. The basic intent of this summary report is to provide the reader with a description of the procedures fol
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This report is a synthesis of research findings and current practices in controlling and protecting pedestrian traffic in work zones. The information presented here is based on a review of research reports and work zone manuals from a selection of state and city highway agencies, discussions with highway officials, and field observations of project
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Barrier separated high-occupancy vehicle lanes, or transitways, have been found to be an effective way to reduce peak period congestion by providing priority treatment for high-occupancy vehicles. The Texas Transportation Institute performed a study to identify the user information needs of this type of facility, and how those needs could best be m
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Recent trends indicate that vehicle miles traveled for large trucks is increasing at a higher rate than for other vehicles. The resulting competition between large trucks and other vehicles for highway space can be expected to result in more multi-vehicle collisions involving large trucks. The likelihood of these collisions causing severe injuries
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This report, Volume I, consists of the Executive Summary of Volume II, Final Report addressing the impacts of in-stream sand and gravel mining upon the stability of river systems in Arizona. The Executive Summary is a condensed version of the Final Report and includes discussion relative to all major categories such as: regulatory practices, struct
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This report presents a comprehensive treatment of the technical and non-technical issues related to the impacts of in-stream sand and gravel mining upon the stability of river systems in Arizona. All major categories are addressed, including such areas as: regulatory practices, structural hazards, economic value, social and environmental factors, s
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Trainload shipments of grain by elevators substantially reduce their transportation costs. However, many elevators must make investments upgrading their plant before they can ship in trainload movements. In this report, a logit model is developed which considers the investment decision for particular elevators in terms of the physical characteristi
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Sprinkle Treatment is the application of a properly graded, pre-coated, non-polishing aggregate to a hot asphaltic concrete wearing course immediately behind the paving machine. The "sprinkled" chips are embedded into the mat with the initial rolling operation. By embedding expensive imported, non-polishing aggregates only in the wearing course sur
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This report contains the Appendices to Volume II, Final Report, addressing the impacts of in-stream sand and gravel mining on channel stability in Arizona. The information contained n the Appendices provides further documentation in support of the major chapters of the final report. Topics addressed in the appendices include: summary of response to
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A method for predicting the annual highway work capacity of Disadvantaged Business Firms (DBE), both individually and collectively, is presented. This method takes into account variables that are used to predict small business failure and also employs different capacity estimation procedures.
This report describes a microcomputer system for analyzing the information collected by state forces in their annual network-level Pavement Evaluation System (PES). Included in the system are the following three subsystems: a) A one-year Maintenance and Rehabilitation (M&R) estimation system, which contains a series of decision trees developed by e
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The BERG2 microcomputer program uses a methology similar to the Modified Berggren method (Aldrich and Paynter, 1953) to estimate the freeze and thaw depths in layered soil systems. The program also provides an estimate of the thaw consolidation in ice rich soils. BERG2 differs from the original Modified Berggren method since it uses the actual froz
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In 1983, experimental Verglimit overlays were placed on two Oregon bridges known to have icing problems. The performance of the test overlays, constructed on the Salmon River Bridge in Clackamas County and the Quartz Creek Bridge in Clatsop County, was very disappointing. While the Verglimit appeared to be effective in melting snow and reducing the
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