Guidelines for Guardrail Implementation (2009) / Chapter Skim
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Pages 21-24
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From page 21... ...
21 The first step in converting the site-specific guardrail selection guidelines shown in Appendices A, B, and C (not published herein) into a route-specific format was to examine the effects of each highway and roadside parameter on the recommended barrier test level.
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From page 22... ...
Thus, the potential benefit of installing guardrail diminishes as hazards are moved further from the travelway. A secondary factor that has the same effect on the benefit of using guardrail is the relationship between guardrail length and the offset to the back of the hazard.
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From page 23... ...
are found outside of this unobstructed region. The size of a typical unobstructed region varies by functional class and from one route to the next.
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From page 24... ...
Highways through rolling terrain are expected to have a high proportion of moderately severe and severe roadside slopes within the clear zone. A significant number of these hazards would be expected to be encountered adjacent to almost every mile of the roadway.
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