Manages applied research projects which provide the scientific foundation that may be used by Transportation Research Board sponsors, The Transportation Research Board does not develop, issue, or publish standards or specifications. Necessarily those of the Transportation Research Board the National Academies of Sciences, Engineering, and Medicine the FHWA or The opinions and conclusions expressed or implied in this report are those of the researchers who performed the research. For other uses of the material, request permission from CRP. It is expected that those reproducing the material in thisДocument for educational and not-for-profit uses will give appropriate acknowledgment of the source of any reprinted or reproduced

GHSA, NHTSA, or TDC endorsement of a particular product, method, or practice. Permission is given with the understanding that none of the material will be used to imply TRB, AASHTO, FAA, FHWA, FTA, Own the copyright to any previously published or copyrighted material used herein.Д¬ooperative Research Programs (CRP) grants permission to reproduce material in this publication for classroom and not-for-profit NCHRP is supported on a continuing basis by funds from participating member states of AASHTO and receives theДЇull cooperation and support of the Federal Highway Administration (FHWA), United States Department of Transportation, underДЄuthors herein are responsible for the authenticity of their materials and for obtaining written permissions from publishers or persons who Initiated an objective national highway research program using modern scientific techniquesГўВЂВ”the National Cooperative Highway Research Recognizing this need, the leadership of the American Association of State Highway and Transportation Officials (AASHTO) in 1962 These problems are best studied through aД¬oordinated program of cooperative research.

Transportation results in increasingly complex problems of wide interest to highway authorities. However, the accelerating growth of highway State DOTs individually or in cooperation with their state universities and others. Often, highway problems are of local or regional interest and can best be studied by Transportation (DOTs) administrators and engineers. Systematic, well-designed, and implementable research is the most effective way to solve many problems facing state departments of

NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM Roadside Barrier Systems Placed on MechanicallyД¬onduct of Research Report for NCHRP Project 22-20(02) Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.Дesign Guidelines for Test Level 3 through Test Level 5 Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book.

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