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Future 2031 Build Conditions <br />For each development scenario, an analysis was completed to determine: when a <br />third lane on TH 10 / 169 would be required; when an interchange at Twin Lakes <br />Parkway would be required; and, the impacts of the 20 year forecasted traffic <br />volumes. It was assumed that traffic would grow on a straight line from existing to <br />2031. <br />The TH 10 / 169 intersections were only analyzed for determining when the third <br />lane and interchange was required. All study intersections were evaluated with the <br />2031 full build analysis assuming the interchange at TH 10 / 169 and Twin Lakes <br />Parkway. Each build scenario is discussed below. <br />Scenario 1 <br />Based on the analysis of future traffic volumes for Scenario 1, both intersections <br />on TH 10 / 169 at 171St Avenue and Twin Lakes Parkway will begin to <br />experience delays in 2015 for traffic on TH 10 / 169 during both the AM and PM <br />peak hours, especially for westbound TH 10 / 169 and northbound Twin Lakes <br />Parkway during the PM peak hour. By adding the third lane on TH 10 / 169 the <br />analysis indicates that the intersections would again begin to breakdown in <br />2023 during the 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 both ramp intersection <br />would operate at LOS C or better during both the AM and PM peak hours. <br />Twin Lakes Parkway at 168th Avenue -This intersection would experience <br />delays for the westbound 168th Avenue approach turning left on to Twin Lakes <br />Parkway during PM peak hour. The overall LOS at this intersection is projected <br />to be E during the PM peak hour. If a traffic signal system or a roundabout is <br />installed the operations would improve to an LOS A. <br />All other study area intersections would be operating at LOS C or better during <br />both the AM and PM peak hours. Table 21-5 shows the results of the 2031 <br />Scenario 1 analysis. <br />City of Elk River <br />Draft Alternative Urban Areawide Review <br />July 2011 <br />Page 64 of 84 <br />~i <br />