Agenda - Council - 12/14/2021 - Laserfiche WebLink

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E. Results of Analysis This section contains the results of the intersection operational analyses based on Synchro/Simtraffic, 11' Edition, and provides recommendations, as necessary to mitigate the impacts. It is noted, the reported results are from the aggregate of 10 SimTraffic simulations which use a random number generator to seed the network with vehicles. These results reflect dynamic conditions and a more accurate than the results of the static analysis reported by Synchro, however, due to random number generator can sometimes show slightly better results on minor movements under higher traffic conditions when the intersections are operating at very good LOS. Table 2 summarize the results of the operational analyses for the 2026 No Build scenario (assumes 1.0 percent annual growth in traffic from existing conditions). Table 2 2026 No-Build Operations Overall/Worst Movement LOS& Delay(sec) Intersection Notes/95t" Percentile Q AM Peak Hour PM Peak Hour Variolite St NW& 173rd Ave NW/ a (0.4)/ ( ) ( )/ ( )a nbl 1.7 a 1.2 a nbl 6.1 NB Q is 27 ft in AM; 175t"Ave NW NB Q is 32 ft in PM Variolite St NW& 161St Avenue EB Q is 37 ft in AM; NW a (1.4)/a wbt(6.6) a (1.7)/a wbt(5.7) EB Q is 43 ft in PM Variolite St NW&Alpine Dr NW a (1.9)/a sbl (3.8) a (1.5)/a sbl (3.9) SB Q is 45 ft in AM; SB Q is 32 ft in PM Nowthen Blvd NW& 175t" EBL Q is 43 ft in AM; Avenue NE a (1.2)/a ebl (4.5) a (2.3)/a ebl (5.6) EBL Q is 30 ft in PM Nowthen Blvd NW& 173rd NBL Q is 8 ft in AM; Avenue NW a (0.8)/a nbt(1.1) a (2.4)/a nbt(3.5) EBR Q is 14 ft in PM Nowthen Blvd NW& 167t" a (3.4)/ ( ) ( )/ ( )b ebl 11.1 a 3.8 b wbl 12.7 EB Q is 30 ft in AM; Avenue NW WB Q is 64 ft in PM Nowthen Blvd NW& Ramsey EBL Q is 46 ft in AM; Blvd NW a (3.9)/a ebl (8.1) a (3.9)/b ebl (11.1) EBL Q is 71 ft in PM 1. Overall Level of Service reported from SimTraffic delay,first letter represents intersection LOS,while second letter represents worst LOS of individual approach.Upper case letters indicate signalized intersection,and lower-case letters indicate unsignalized intersection 2. 95th percentile queues are a result from an average of 10 SimTraffic simulations. The results shown in Table 2 indicate all intersections and worst movements are expected to operate at acceptable LOS in 2026 without the proposed project. Further, the results indicate all intersections will experience short vehicle queues. No intersection modifications are suggested for the 2026 No-Build Traffic Impact Study Page 20 Sotarra-Trott Brook S2 Traffic Solutions August 10,2021