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Scenario 3 <br />Based on the analysis of future traffic volumes for Scenario 3, both intersections on <br />TH 10 / 169 at 171St Avenue and Twin Lakes Parkway will begin to experience <br />delays in 2013 for traffic on TH 10 / 169 during both the AM and PM peak hours, <br />especially for eastbound and westbound TH 10 / 169 during the PM peak hour. By <br />adding the third lane on TH 10 / 169 the analysis indicates that the intersections <br />would again begin to breakdown in 2017 during both the AM and PM peak hour. <br />TH 10 / 169 Interchange -The 2031 build conditions were analyzed assuming a <br />standard diamond interchange at TH 10 / 169 and Twin Lakes Parkway with the <br />future roadway network shown in Figure 21- 4, and assuming full build of the <br />development area. The results of the analysis indicate that with the standard <br />diamond interchange the amount of traffic turning at the interchange ramps is <br />extremely high and cannot be accommodated with this type of interchange. The <br />overall LOS at both ramp intersections is LOS F in both the AM and PM peak hours. <br />Assuming an interchange with additional capacity such as a single point or diverging <br />diamond, the overall LOS could be improved to an overall LOS E with some <br />movements still at LOS F. <br />Twin Lakes Parkway at 168th Avenue -This intersection would experience delays <br />for both the northbound and westbound approaches during AM and PM peak hours. <br />The overall LOS at this intersection is projected to be F during both the AM and PM <br />peak hours. If a roundabout or traffic signal is installed the operations would <br />improve to an LOS C. <br />Twin Lakes Parkway at Wilson Street -This intersection is located on the south side <br />of TH 10 / 169. The delays at this intersection are strictly the result of the <br />interchange operation and would be eliminated with a higher capacity interchange. <br />Twin Lakes Parkway at 171St Lane -The eastbound and westbound minor street <br />approaches will experience some delays during the PM peak hour. However, the <br />overall intersection LOS is still at a B. <br />All other study area intersections would be operating at LOS C or better during both <br />the AM and PM peak hours. Table 21-7 shows the results of the 2031 Scenario 3 <br />analysis. <br />City of Elk River <br />Draft Alternative Urban Areawide Review <br />July 2011 <br />Page 68 of 84 <br />ii <br />