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A roundabout is a type of circular intersection in which road <br />traffic is permitted to flow in one direction around a central <br />island, and priority is typically given to traffic already in the <br />junction. The types of conflicts that occur at roundabouts are <br />different from those occurring at conventional intersections; <br />namely, severe conflicts from crossing and left-turn movements <br />are not present in a roundabout. The geometry of a roundabout <br />forces drivers to reduce speeds as they proceed through the <br />intersection; the range of vehicle speeds is also narrowed, <br />reducing the severity of crashes when they do occur. Pedestrians <br />also only have to cross one direction of traffic at a time at <br />roundabouts, thus reducing exposure to vehicle traffic. <br />Cost $$$ <br />Low Cost / Quick Build alternative available <br />LRSM ID S16/NS04 <br />INTERSECTIONS & ROADWAYS <br />SAFE SYSTEM HIERARCHY <br />Remove Severe <br />Conflicts <br />Reduce Vehicle <br />Speeds <br />Roundabout <br />Tier 1 Tier 2 Tier 3 Tier 4 <br />Other Reference Information <br />FHWA Manual for Selecting Safety Improvements on High Risk Rural Roads <br />Barrier in the center of the roadway that physically separates <br />opposing vehicular traffic. Median barriers can also help control <br />access to and from side streets and driveways, reducing the <br />number of conflict points. <br />Cost $$$ <br />Low Cost / Quick Build alternative available <br />LRSM ID R03 <br />INTERSECTIONS & ROADWAYS <br />SAFE SYSTEM HIERARCHY <br />Remove Severe <br />Conflicts <br />Median Barrier <br />Tier 1 Tier 2 Tier 3 Tier 4 <br />Median Barrier <br />Roundabout <br />19Kittitas County | Snoqualmie Pass Comprehensive Safety Plan | Appendix J: Countermeasures Toolbox