This research effort was conducted to determine the effectiveness of low-cost countermeasures in reducing the number of accidents at narrow bridges. The principal tasks consisted of 1) developing an accident based effectiveness evaluation plan and 2) conducting an operational based effectiveness evaluation. This report describes the activities and
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This Guide describes how localities can plan, implement, and evaluate a pedestrian safety program. A six-step Model Pedestrian Safety Program is described: Step 1- Problem Identification, describes techniques for determining the extent of the pedestrian safety problem through accident and behavioral data collection and evaluation. Step 2- Identify
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This report documents the second phase of an FHWA study, entitled "Pavement Condition Monitoring Methods and Equipment". In this phase selected distress survey methods and devices, representing a range in automation, were tested from July to September 1986. The following methods and devices were included in the testing: manual mapping, detailed vis
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Selected data on highway toll facilities in the United States are contained in Table T-1 of this report based on a survey of facilities in operation, financed, or under construction as of January 1, 1987. The data includes information such as the name, financing or operating authority, location and termini, feature crossed, length, and road system
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All geotechnical predictions involve uncertainties. These are accounted for additionally by conservative factors of safety. Risk based design, on the other hand, attempts to quantify uncertainties and to adjust design conservatism accordingly. Such methods cannot rationalize all the uncertainties of geotechnical engineering, but they provide increa
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This report discusses the results of a feasibility study dealing with the development of a new simulation program by combining the two existing simulation programs HVOSM and BARRIER VII. The first of these programs has a sophisticated vehicle model including vehicle handling and maneuvering and one of its versions, HVOSM-RD2, even has the reported
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This report surveys the published literature in geotechnical engineering and related disciplines for applications of probabilistic and statistical methods to soil and rock mechanics problems. Published references up to and including 1982 are summarized to establish the state of the art at that time. A bibliography of approximately 650 items is appe
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The objectives of this study are to conduct laboratory tests and develop a methodology to quantitatively determine embankment damage and assess protective measures. During the study, available literature and field data were collected. The embankments used 4n this study are 6 ft (1.8 m) high, 10 to 22 ft (3.0 to 6.7 m) in crest width, and 3 ft (0.9
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The report compares and contrasts the automated PASCO method of pavement evaluation to the manual procedures used by the Iowa Department of Transportation (DOT) to evaluate pavement condition. Iowa DOT's use of IJK and BPR roadmeters and manual crack and patch surveys are compared to PASCO's use of 35-mm photography, artificial lighting and hairlin
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A study of four major concrete pavement joint rehabilitation techniques has been conducted, including: pressure relief joints, full-depth repairs, partial-depth repairs and joint resealing. The products of this research include the following for each technique: a summary of published research, detailed documentation of the design and performance of
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Appendices of a study of four major concrete pavement joint rehabilitation techniques has been conducted, including: pressure relief joints, full-depth repairs, partial-depth repairs and joint resealing. The products of this research include the following for each technique: a summary of published research, detailed documentation of the design and
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This Phase II Final Report presents implementation plans and quotation assembly drawings for construction of a plantship designed to convert natural gas to methanol. The Phase I Final Report presented an assessment of the technical and economic feasibility of producing fuel grade methanol aboard a floating conversion plant using natural gas from of
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This project evaluated bridge railings. State bridge rail designs submitted to the Federal Highway Administration (FHWA) were rated and the best of each type were selected for crash test evaluation. When necessary, the designs were improved and retested. Most of the crash tests were conducted with 4500-lb (2025-kg) cars at 60 mph (95 km/h) and a 25
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This report summarizes the analysis procedures and concepts used by the highway research community to design roadside safety appurtenances. The concepts of momentum, kinetic energy and work are presented. Applications to the design of impact attenuators, breakaway hardware, and longitudinal barriers are discussed. The objective of the report is to
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This report is an Informational Guide for highway agencies on the use of low-cost improvements to alleviate operational problems on two-lane highways. The Guide addresses both passing and turning improvements that can be constructed for a lower cost than construction of a continuous four-lane highway. The passing improvements presented in the Guide
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Poor sign reflectivity is a contributor to the high proportion of nighttime accidents. At night, signs must have enough brightness to allow a driver to recognize and react to the intended message of the sign in a safe manner. Failure to recognize a regulatory sign, such as a STOP sign, could result in a severe accident. The Manual on Uniform Traffi
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