Agenda - Planning Commission - 06/23/2022

Home

Josh Nyquist,Executive Director of Building Operations May 26,2022 PACT Charter School I Traffic Impact Study Page 7 Table 3. Existing Weekday Conditions Peak Hour Traffic Operations/Capacity Analysis A.M. Peak Hour Dismissal Peak Hour P.M. Peak Hour Study Intersection LOS Delay Queue LOS Delay Queue LOS Delay Queue Variolite Street/173rd Avenue(1) A/A 9 sec. NB/1 A/A 9 sec. NB/1 A/A 10 sec. NB/1 Variolite Street/161st Avenue(1) A/A 10 sec. WB/1 A/A 10 sec. EB/1 A/A 10 sec. EB/1 Variolite Street/Alpine Drive(1) A/B 11 sec. SB/1 A/A 10 sec. SB/1 A/B 11 sec. SB/1 Armstrong Boulevard/161st Avenue(1) A/B 11 sec. EB/1 A/B 12 sec. WB/1 A/B 15 sec. WB/1 Armstrong Boulevard/Alpine Drive(1) A/C 18 sec. WB/2 A/C 16 sec. WB/2 A/E 45 sec. WB/4 Armstrong Boulevard/Alpine Drive(3) A/A 6 sec. EB/1 A/A 6 sec. NB/1 A/A 9 sec. NB/3 Ramsey Boulevard/Alpine Drive(2) B/B 12 sec. SB/2 A/B 11 sec. NB/1 B/B 13 sec NB/2 175th Avenue/Nowthen Boulevard (1) A/B 13 sec. EB/1 A/B 12 sec. EB/1 A/B 13 sec. EB/1 (1) Indicates a side-street stop-controlled intersection, where the overall LOS is shown followed by the worst approach LOS.The delay shown represents the worst side-street approach average delay per vehicle.The queue shown is the 95th percentile queue(in vehicles)for the worst approach at the intersection. The 95th percentile queues shown in red bold font spill back to and beyond the adjacent upstream intersection. (2) Indicates an all-way stop-controlled intersection,where the overall LOS and average delay per vehicle are shown.The queue shown is the 95th percentile queue(in vehicles)for the worst side-street approach at the intersection.The 95th percentile queues shown in red bold font spill back to and beyond the adjacent upstream intersection. (3) Indicates an improvement to provide a single-lane roundabout intersection,where the overall LOS and average delay per vehicle are shown.The queue shown is the 95th percentile queue(in vehicles)for the worst side-street approach at the intersection.The 95th percentile queues shown in red bold font spill back to and beyond the adjacent upstream intersection. Year 2028 No-Build Conditions To understand how the existing transportation system and general background growth are expected to impact the study intersections, year 2028 no-build conditions were reviewed (no proposed PACT Charter School site-generated traffic is included in this scenario). Note that year 2028 represents the year where the PACT Charter School can be assumed to be completed with full occupancy of the proposed development and includes all phases of the proposed PACT Charter School project plus completion of the adjacent future proposed St. Katharine Drexel Church. Background Growth To account for general background traffic growth within the study area, a conservative annual growth rate of one (1)percent was applied to the existing peak hour volumes to develop year 2028 background traffic forecasts. Intersection Capacity Analysis To determine how the adjacent roadway network will accommodate the year 2028 no-build traffic volumes, an intersection capacity analysis was completed using Synchro/SimTraffic Software. 2028 no-build traffic forecasts,which include general background growth, are shown in Figures 3A and 3B.