In some connections of W-beam and thrie-team guardrail elements, it is necessary to bolt together three thicknesses of rail element. Such a connection can not be assembled without enlarging the standard round connection bolt holes. One solution to this problem is to use elongated holes with the long axis of the hole at an angle to the longitudinal
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A side-mounted bridge railing consisting of wide-flange posts and tubular steel rail elements was designed and tested to performance level two of the 1989 AASHTO Guide Specifications for Bridge Railings. The posts are blocked out from the edge of the deck to provide maximum useable space on the bridge. Acceptable performance was demonstrated in ful
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Full-scale crash tests with a 5,400-lb (8,165-kg) truck were performed on a New Jersey safety shape concrete parapet to confirm that it would meet requirements for performance level two of the 1989 AASHTO Guide Specifications for Bridge Railings. Performance was acceptable. A structural analysis of the parapet with the specified reinforcing steel i
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FHWA recently adopted new performance evaluation guidelines for roadside safety features set forth in NCHRP Report 350. Most of the existing roadside features were tested according to the previous guidelines contained in NCHRP Report 230 and there are concerns as to how the existing roadside safety features would perform under the new guidelines. S
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The information presented in this course has been designed to provide useful information about asphalt pavement repair to persons who may not be experienced in this area but who are still responsible for the upkeep of asphalt pavements in their particular agency. This course has been prepared to address asphalt road problems for local agencies in b
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Performance-Related Specifications (PRS) are the latest step in the continuing quest to improve the quality of the Nation's roadways. The research that has been performed to develop PRS provides a solid foundation of data to address the following two issues: (1) how you measure quality and (2) how you reward quality work. This booklet defines PRS,
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A combination concrete parapet and metal railing was designed for performance level one of the 1989 AASHTO Guide Specifications for Bridge Railings. Computed strength of the railing is 18 kips (80 kN) at 40 in. (1.02 m) above the deck (sidewalk) or 91 kips (405 kN) at 27 in. (686 mm) above the deck (sidewalk). The railing was tested to performance
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The original Illinois 2399 bridge railing design has been used as a retrofit railing on selected structures. A structural analysis indicated that strength of the railing could be increased by changing positions of the lower and upper rail elements to obtain more beam strength along the top. The modified design (Illinois 2399-1) was tested to perfor
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This report is a sequel to a previous state-of-the-art published by the Strategic Highway Research Program (SHRP) in 1991 and is based on review of selected literature on high performance concrete (HPC) with particular reference to highway applications. It covers primarily a six-year period from 1989 to 1994 for which the authors have recently comp
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Several important issues concerning the effect of slab support on concrete pavement performance were studied in a National Cooperative Highway Research Program project, "Support Under Concrete Pavements" (NCHRP 1-30). The results were promising, however, the data that were available for analysis were limited. This study was conducted to further fie
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This report documents an investigation into the feasibility of using accident data to derive estimates of the rate at which errant vehicles unintentionally encroach into the roadside on level, tangent sections of two-lane rural roads. In addition, issues related to estimating the percentage of unreported accidents were also investigated. The report
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In the course of developing automated vehicle-roadway systems, opportunities to deploy vehicle control systems at intermediate stages of development may emerge. Some of these systems may provide a significant efficiency or safety enhancement to existing operations with manually driven vehicles. Under certain circumstances, public transportation and
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This ROSANV Technical Note is in response to all the inquiries during the Transportation Research Board Annual Meeting that was held in January 1997 in Washington, D.C., and subsequent phone, fax and e-mail inquiries. The primary interest appears to be in the areas of aggregate segregation measurement, texture measurement in general, and texture me
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Established in 1981 as the Rural Technical Assistance Program, the Local Technical Assistance Program (LTAP) is a program of the Federal Highway Administration (FHWA). LTAP provides for local highway agencies' improved access to highway technology to meet the growing demands placed on local roads, bridges and public transportation. LTAP has establi
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