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

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Table 5 2040 Build Operations I I Overall LOS& Delay(sec) Intersection Notes/95t" Percentile Q AM Peak Hour PM Peak Hour Variolite St NW& 173rd Ave NW/ NB Q is 30 ft in AM; 175t"Ave NW a (0.5)/a nbl (2.3) a (0.4)/a nbl (2.3) NB Q is 31 ft in PM Variolite St NW&Site Access WB Q is 30 ft in AM; (170th Ave NW) a (0.9)/a wbl (3.9) a (0.8)/a wbl (4.7) Wg Q is 21 ft in PM Variolite St NW& 1615t Avenue EB Q is 43 ft in AM; NW a (2.1)/a eb (5.8) a (1.8)/a wb(6.4) EB Q is 46 ft in PM Variolite St NW&Alpine Dr NW a (2.2)/a sbl (4.2) a (2.0)/a sbl (5.6) SB Q is 46 ft in AM; SB Q is 44 ft in PM Nowthen Blvd NW& 175t" a (1.3)/ ( ) ( )/ ( )a ebl 6.2 a 2.8 b ebl 11.9 EBL Q is 26 ft in AM; Avenue NE EBL Q is 45 ft in PM Nowthen Blvd NW& 173rd a (2.2)/ ( ) ( )/ ( )a ebl 8.9 a 3.8 b ebl 13.6 EBL Q is 56 ft in AM; Avenue NW EB Q is 44 ft in PM Nowthen Blvd NW& 167t" EB Q is 40 ft in AM; Avenue NW a (3.8)/a wb (9.4) a (4.9)/c wb(20.3) Wg Q is 70 ft in PM Nowthen Blvd NW& Ramsey EBL Q is 38 ft in AM; Blvd NW a (5.0)/c ebl (18.1) a (8.9)/e ebl (36.9) EBL Q is 187 feet in PM 3. 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 5 indicate all intersections are expected to operate at acceptable overall LOS in 2040 with the proposed project. Further, the results indicate all intersections will experience short to moderate vehicle queues, which are typical for peak hour conditions. (Again, when the operations of the intersection and critical movements are at LOS A, the random number generator can sometimes result in slightly better delay or queuing results on minor movements even with higher traffic conditions.) However, the eastbound approach to Nowthen Boulevard NW from Ramsey in the PM Peak hour will be at capacity, and changes to the traffic control should be considered. Preliminary review of traffic signal and roundabout warrants suggest this intersection will satisfy peak hour warrant in the 2040 planning horizon year. Operational analysis of the potential traffic control change options indicates all movements will operate at LOS B or better, with short queues. It is noted if traffic control changes occur modifications to the intersection geometry will be needed. Review of minor modifications such as converting the northbound by-pass lane to a dedicated left turn lane will improve safety and show a slight reduction in northbound left Traffic Impact Study Page 23 Sotarra-Trott Brook S2 Traffic Solutions August 10,2021