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<br />Evaluation of Phasing Options for Highway 10 <br />May 20, 2008 <br />Page 5 <br /> <br />The second scenario that was modeled is shown as Figure 2 and includes the Highway 10/County 96 <br />grade separation and the new local access interchange with the southbound exit, an access road to Scherer <br />Brothers, and no west frontage road connection to County 96. Operational modeling shows that without <br />the west frontage road, the County 96/1-35W ramp will still experience an overall LOS E in the pm peak <br />period (see Table 1). This result leads to the conclusion that phasing the west frontage road along <br />Highway 10 is not feasible and will result in traffic operational problems with the County 96/1-35W <br />interchange. <br /> <br />The final scenario that was modeled is shown as Figure 3 and includes the Highway 10/County 96 grade <br />separation and the new local access interchange with the southbound exit and west frontage road from <br />Scherer Brothers to County 96. Operational modeling shows all intersections in the study area will <br />operate at LOS D or better if the complete interchange is built with the west frontage road (see Table I). <br /> <br />Conclusion <br />The southbound Highway 10 exit ramp for the proposed new local access interchange provides a key <br />movement for traffic to go east on County 96. This movement is currently handled by the signalized <br />County 96/Highway 10 intersection. The proposed grade separation project will reallocate those trips to <br />other intersections and will require mitigation to ensure acceptable traffic operations and to prevent <br />further degradation of the 1-35W corridor. Therefore, it is recommended that, in conjunction with the <br />Highway 1 O/County 96 grade separation project, a new full access interchange be built along Highway 10 <br />with a west frontage road connection to County 96. <br /> <br />Furthermore, since phasing the interchange and frontage road will not work from a traffic operations <br />perspective, no further cost-benefit analysis or study of phasing was conducted for the interchange or the <br />Scherer Brothers access. <br /> <br />Next Steps <br />It is recommended that the preliminary design process be initiated for the full access interchange as <br />shown on Figure 3. This work will allow the County's grade separation project and the interchange <br />design to go hand in hand in order to optimize the design and resolve remaining neighborhood concerns. <br />The first steps in the preliminary design process will be to finalize the location of the interchange and to <br />detemline the width of the new bridge while making every effort to reduce the impacts to Arden Manor <br />through the design of the roadways and ramps. <br /> <br />mdb <br /> <br />Attachments <br />. Phasing Figures <br />. Peak hour volume and LOS tables <br /> <br />c: Stacie Kvilvang <br />Chris Chromy <br />Greg Hoag <br />Kris Giga <br />Gen McJilton <br /> <br />s\pI\r\ryaco',101752'.phJ.\ingn:port'phasing memorandum &:x <br />