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Other Reference Information <br />FHWA Manual for Selecting Safety Improvements on High Risk Rural Roads <br />Impact attenuators bring an errant vehicle to a more-controlled <br />stop or redirect the vehicle away from a rigid object. Impact <br />attenuators are typically used to shield rigid roadside objects <br />such as concrete barrier ends, steel guardrail ends and bridge <br />pillars from oncoming automobiles. Attenuators tend to be <br />installed where it is impractical for the objects to be removed. <br />Cost $$ <br />LRSM ID R05 <br />OTHER <br />Increase <br />Attentiveness <br />and Awareness <br />SAFE SYSTEM HIERARCHY <br />Remove Severe <br />Conflicts <br />Impact Attenuators <br />Tier 1 Tier 2 Tier 3 Tier 4 <br />The installation of median guardrail is most suitable for use in <br />traversable medians having no or little change in grade and cross <br />slope. While these systems may not reduce the frequency of <br />crashes due to roadway departure, they can help prevent a lane- <br />departure crash from becoming a head-on collision. <br />Cost $$ <br /> <br />OTHER <br />SAFE SYSTEM HIERARCHY <br />Remove Severe <br />Conflicts <br />Median Guardrail <br />Tier 1 Tier 2 Tier 3 Tier 4 <br />Impact Attenuators <br />Median Guardrail <br />58 Appendix J: Countermeasures Toolbox | Snoqualmie Pass Comprehensive Safety Plan | Kittitas County