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 Long Term Pavement Performance (LTPP) data analysis was intended to examine, in a practical way, the LTPP database and to identify the site conditions and design features that significantly affect transverse joint faulting. Key products developed as part of this research were (1) answers to frequently asked questions regarding design features
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To learn how European countries monitor traffic, the Federal Highway Administration (FHWA) sponsor a scanning tour of the Netherlands, Switzerland, Germany, France and the United Kingdom in June 1996. The team focused on types of data collected, data collection methods, organizational arrangements for data collection, equipment and data validation
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A key design challenge faced by engineers using the 1993 AASHTO Guide for Design of Pavement Structures (AASHTO Guide) is the determination of appropriate design parameters for the subgrade and pavement materials. The Long-Term Pavement Performance (LTPP) data analysis project, Analyses Relating to Pavement Material Characterizations and Their Effe
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This is the first Federal Highway Cost Allocation Study (HCAS) since 1982. There are two key reasons for conducting this study. The first is to determine how changes in the Federal highway program and user fees which support that program have affected the equity of Federal highway user fees. The second is to coordinate this effort with the concurre
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With the goal of improving traffic flow and safety on urban freeways, the Texas Department of Transportation initiated a program of installing ramp metering on most freeways in Houston. This research provides advanced methods and strategies for implementing ramp metering, called flow signals in Houston, which will enhance motorist compliance with t
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The upgrading and widening of highways across the state is causing the directly affected businesses and property owners to inquire about the possible economic impacts of such construction. This report documents the during- and after-construction effects of the widening of a 15.13 kilometer undivided section of State Highway (S.H.) 199, in Parker Co
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This document is the culmination of the seventh offering of an innovative transportation engineering graduate course at Texas A&M University entitled, "Advanced Surface Transportation Systems". The seventh offering of the course was presented during the summer 1997 term. As part of the course, a Mentors Program provides students with unique learnin
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The monthly edition has information concerning the waterways of the First Coast Guard District. Weekly supplemental editions containing only new information will be sent for the rest of the month. NOTE: Chart corrections and Light List changes are published only once each. Subscription to this publication is free.
A hydrologic spatial database of the drainage area of the Gulf of Mexico that spans the area from the Sabine River to the Rio Grande has been prepared. A brief description of the data, as well as how to obtain them, is also given. The database includes the following files: (1) digital elevation models, (2) reach-files, (3) hydrologic units, (4) pre
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A literature review on flow hydrographs, peak discharges, and computer-based hydrologic and hydraulic modeling has been prepared. The first section deals with flow estimation, with special attention given to flood peak discharges (because they are a key design parameter for highway drainage structures). The second section addresses the use of compu
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The project provided useful information on the use of super-single and singled-out dual truck tires. It highlighted the limited use of single-tire configurations in the United States, identified the factors that contributed to an increased use of these tires in certain countries, and indicated an unlikely substantial increase of their use in the ne
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An experimental construction method was evaluated at the Lost River Bridge in Klamath County to reduce the discontinuity between the bridge and the roadway. The method included combining soil in six 300-mm lifts interlaced with geotextile reinforcement. The original plan was to replace the bridge and construct a wider bridge at the site. The final
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The thermal protection requirements for cold weather masonry, as established in current industry specifications, were evaluated. Experiments were conducted to define the most relevant factors in the process of freezing of newly placed mortar. The effect of unit absorption on the moisture content of mortar during the first hours after assembly was a
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This paper describes a process, via user- air traffic management (ATM) data exchange, for enabling user preferences in an ATM-based system. User preferences may be defined in terms of a four-dimensional (4D) user-preferred trajectory, or a series of profile constraints (e.g., speed, routing, time), depending on user capability. An emphasis is place
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The development of advanced automation for arrival aircraft into the terminal area is being investigated for both the air traffic control (ATC) and airborne environments. For the automation to be effective and provide the best advisory information, aircraft trajectories must be accurately estimated. One way to enhance the aircraft's adherence to th
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This is the first Federal Highway Cost Allocation Study (HCAS) since 1982. There are two key reasons for conducting this study. The first is to determine how changes in the Federal highway program and user fees which support that program have affected the equity of Federal highway user fees. The second is to coordinate this effort with the concurre
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