Guidelines for Guardrail Implementation (2009) / Chapter Skim
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Pages 12-17
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From page 12... ...
12 The basic approach to the development of guardrail application guidelines involves identifying the full range of guardrail applications and conducting an economic analysis of a reasonable subset of these conditions. Therefore, it is necessary to determine the types of hazards, proposed guardrail safety treatments, and roadside and roadway conditions commonly found along highways.
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From page 13... ...
and a comprehensive set of guardrail treatment guidelines, TL-2 through TL-5 guardrails were selected for inclusion in this study. All available guardrail terminals have been designed to meet Test Levels 2 or 3.
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From page 14... ...
14 Figure 7. Barrier layout variables for slope hazards.
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collected by Hutchinson and Kennedy (7) or Cooper (8)
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hazard offsets are indirectly related to minimum shoulder widths and minimum clear-zone widths. Roadside hazards would seldom be allowed to encroach onto the shoulder of a roadway and few highway agencies would consider erecting safety treatments for hazards outside of the clear zone.
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From page 17... ...
17 Table 10. Truck volume distributions by highway classification.
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