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<br /> <br /> <br />COUNTY ROAD E & OLD SNELLING AVENUE ICE PAGE 16 <br />WSB PROJECT NO. 011498-000 <br />CITY OF ARDEN HILLS <br />Evaluation Considerations <br /> <br />Right of Way Impacts <br /> <br />Maintaining the existing geometry and traffic control (all-way stop control application) <br />would require no additional right of way. The build alternative would require the <br />acquisition of right of way. <br /> <br />Project Costs <br /> <br />x All-Way Stop Control (existing geometry and traffic control) – would require no <br />construction or maintenance costs. <br />x Roundabout – Total cost for the construction of a roundabout and surrounding <br />improvements is estimated to be ~$1,200,000. <br /> <br />Political Consideration / Public Input <br /> <br />This project is in the pre-design stage and the purpose of this Intersection Control <br />Evaluation is to provide data and analysis to decision makers regarding the <br />performance, safety, operations and other characteristics of the existing traffic control, <br />traffic signal control and a single-lane roundabout. <br /> <br />The traffic signal control alternative does not meet warrants necessary for installation of <br />a traffic signal. The existing all-way stop condition is expected to operate poorly with <br />expected traffic growth. The roundabout is expected to provide a safer and more <br />efficiently operating intersection than the other alternatives. <br />Design Data <br /> <br />The roundabout alternative would be designed to be an urban, single-lane roundabout. <br />The geometric layout of the roundabout alternative is provided in Figure 5. The design <br />vehicle used for this intersection is a WB-62. The truck turning paths are shown in Figure <br />6. The circulatory roadway width for the roundabout alternative would be 20’ (face-to-face <br />of curb). A 14’ truck apron would encompass the center island to provide space for larger <br />trucks to navigate the roundabout. A fast path was also completed for this intersection <br />and is summarized in Figure 7. The preliminary design of the roundabout alternative <br />meets the speed requirements in NCHRP 672: Roundabouts an Informational Guide, 2 nd <br />Edition. A horizontal sight distance analysis was completed for this intersection, and the <br />results are shown in Figure 8.