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Roseville Starbucks Traffic Study September 30, 2022 Page 10 Site Plan Review A review of the proposed site plan was completed to identify any issues and recommend potential improvements with regard to drive-through operations, access, and circulation. Based on field observations, there is adequate sight distance at the existing right-in/right-out access location on Twin Lakes Parkway to clearly identify approaching vehicles. Special consideration should be made to limit any sight distance impacts from future landscaping and signing. No other traffic control or circulation issues are expected. Drive-Thru Queuing Review A review of the drive-thru queuing storage area was completed to identify if queues from the proposed drive-thru extend beyond the provided storage distance. Therefore, a literature review and field observations were completed to understand expected queueing lengths for the proposed coffee shop. Note, the Starbucks Coffee at 2305 Fairview Avenue N (across from Rosedale Center) was observed during the weekday morning and Saturday midday peak hours. According to the Drive-Through Queue Generation Study completed by Counting Cars in 2012, maximum queues at a coffee shop can extend to 16 vehicles, with an 85th percentile queue of 14 vehicles. Additionally, drive-thru queuing observations indicate a maximum of 15 vehicles and an approximate 85th percentile of 13 vehicles during those peak hours, which is consistent with the Drive-Through Queue Generation Study. On average there were approximately 10 vehicles queued. Note, the maximum observed queues typically lasted for less than one (1) minute in duration. Based on the site plan provided, there is room for 12 vehicles to queue within the drive-thru lane before impacting the internal parking lot circulation. Note, this will block the proposed trash enclosure area, however, that is expected to be utilized outside of peak hours. It is expected that the proposed drive-thru will accommodate the majority of the expected drive-thru queues at the site, however, approximately 25 percent of the peak hour trips are expected to queue beyond the storage and could be expected to queue within the overflow areas shown in Figure 6. Additionally, potential signing improvements are shown in Figure 6 indicating to motorists to not block access from the parking lot drive aisle and directional signing within the site can be provided to limit the number of customers exiting the Starbucks site from conflicting with potential drive-thru queue. The site should be monitored to determine if the maximum drive-thru queues ever extend beyond the available storage and spill into the parking lot. However, these queues typically would be expected to occur during the a.m. peak hour and not impact operations at Walmart and/or Panda Express.