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.
Bridge Rail EXpert System (BREXS) is an advisory system built to aid novice engineers in coping with bridge rail design and retrofit. Motivation for development of BREXS stems from a need to integrate domain expertise and knowledge from complementary disciplines. Development goals for this system are to incorporate bridge rail knowledge bases, brid
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This report provides a comprehensive assessment of strategies for alleviating urban traffic congestion. In particular, this report provides a macroscopic, areawide assessment of traffic congestion problems in Texas and insight to the potential for alleviating these problems. In examining the potential of various strategies for alleviating congestio
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Small sign supports and installations represent a major and ongoing investment by the Texas Department of Transportation. The development of a generic system could result in substantial savings without sacrificing safety. To this end, during the period of 10/21/1987 - 8/31/1989, the Texas Department of Transportation and the Texas Transportation In
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This report presents guidelines as to how highway agencies can better prepare to handle major transportation emergencies. It is prepared as a planning document, designed to illustrate how an agency can develop and integrate a system of preparations into its normal state of operations that will facilitate that agency's ability to maintain and even e
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In order to minimize the cost of earth retaining structures, particularly for the low to medium height retaining walls required by highway departments, a new design of retaining wall was investigated. This utilized facing panel units anchored into a cement stabilized compacted fill. Only short anchors are required to retain the facing panels, as me
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A low-profile portable concrete barrier has been developed for use in low-speed (45 mph [73 km/h] or less) construction zone. The performance of this barrier is demonstrated through the results of two full-scale crash tests. It is recommended for immediate use in appropriate applications.
Law enforcement is considered an important contributor for maintaining traffic safety. However, limited resources, such as staff and funds, constrain the efforts of police in traffic law enforcement. New technologies such as automated enforcement may offer a partial solution to this problem. Information on automated enforcement devices currently be
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The Texas Department of Transportation operates and maintains a large fleet of automotive equipment. The multi-echelon maintenance system supporting the fleet has, as primary elements, major shop facilities at each Departmental District Office. Because of the large volume of work orders and the sophistication of newer automotive systems, purchase o
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Increasingly, and especially over the last decade, U.S. trucking operations are favoring automatic truck transmissions over manual transmissions. Such growth has been the result of the various benefits that are associated with automatic transmissions, including reduced cost, better maintenance, and improved safety. With approximately 2,600 dump tru
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Automated speed enforcement (ASE) devices have been and are being used In many countries to supplement limited enforcement resources. Although these devices have been tried In the U. S., they have not met with great success. The objectives of this research were: to review how ASE devices have been used as part of an enforcement agency's strategy; t
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This report summarizes the results of the survey of the North Central Expressway automobile and transit panelists conducted in May 1991. The results of the survey indicate that travel patterns in the corridor have not deteriorated significantly since the start of Expressway construction south of 1-635. Panelists did report a slight reduction in the
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This report presents the survey procedures used and data collected in the development of commodity flow statistics for movements over Texas Highways. Response rates, sampling procedures, questionnaire design and the types of data provided by the responding motor carrier firms and truck operators are presented and discussed.
This report is a summary of activities conducted by the Texas Transportation Institute (TTI) over a two-year period for the Houston District Office of the Texas Department of Transportation (TxDOT) as part of a study entitled, "Planning, Design, and Operations of Transportation Facilities in Houston." The objective of the study is to provide the Ho
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This order prescribes the responsibilities and procedures for Federal Aviation Administration (FAA) Directorate personnel to review and evaluate proposals for control of parts shipped in advance of type certification of a new aircraft, aircraft engine, or propeller by manufacturers with an approved production inspection system or production certifi
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Oregon. Department of Transportation. Materials and Research Section
1991-10-01
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Asphaltic Concrete (AC) and Portland Cement Concrete (PCC) are common roadway materials used in Oregon. In a recent construction project, Poverty Flats - Mecham Section, the Oregon State Highway Division (OSHD) designed a "test section" consisting of one AC lane and one Continuously Reinforced Concrete (CRC) lane. The inside lane consists of AC and
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The surface transportation reauthorization bills now being considered by the Congress continue the government-dominated approach that has not worked in the past. They ignore the results of 25 years of research (much of it federally funded) that has demonstrated the problems of the conventional approaches. Public transit monopolies are now slated to
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Oregon. Department of Transportation. Materials and Research Section
1991-10-01
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Oregon's use of statistical pay adjustments (contractor incentives) in AC pavements began in 1985 as part of a nationwide trend toward End Result Specifications (ERS's). Oregon State Highway Division (OSHD) management became concerned that the State should be receiving something of corresponding value in return for these payments. The study include
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This study first presents the historical background and an overview of the technical basis for Oregon's current method of statistical quality control. It then evaluates the benefits that the State of Oregon receives by paying out bonuses to contractors on asphalt concrete paving jobs and makes recommendations for improving quality control methods.
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