HomeMy WebLinkAbout013 Queuing Analysis Letter February 14, 2024 Mr. Erik Ringsak, PE 895 Technology Blvd, Ste 203 Bozeman, MT 59718 Reference: Queuing Analysis, TruNorth Center Project No. 24047 Dear Erik: The purpose of this letter is to provide a queuing analysis for the proposed ALZA Coffee & Doughnuts located in the TruNorth Center in Bozeman, Montana. The proposed site is located on the northeastern side of the site, south of East Main Street and west of Haggerty Lane. Access is proposed via existing driveway approaches to the TruNorth Center via Haggerty Lane, East Main Street, and Highland Boulevard. A site plan is attached. Trip generation calculations were performed for the purpose of projecting queuing at the site using previous site assumptions approved by the City of Bozeman. It was assumed that 1,503 square feet of the total site would service patrons of the business, and trips for this area were calculated using Land Use 937 – Coffee/Donut Shop with Drive-Through Window from the Institute of Transportation Engineers (ITE) Trip Generation Manual, 11th Edition. It was calculated that 76 total trips would arrive to the site during the weekday AM peak hour of the generator, which was found to be the worst-case scenario based on the ITE trip generation rates. Based on information provided by the client for a similar coffee/donut shop, it was found that 69.9 percent of entering vehicles are expected to use the drive-thru, with 30.1 percent parked trips. Therefore, approximately 53 vehicles would be expected to enter the drive-thru during the highest hour of the day. The proposed drive-thru provides a storage capacity for approximately nine (9) vehicles (20-foot headway per vehicle) from the order pick-up window on the western side of site to the back of the drive-thru lane before impacting internal operations within the TruNorth Center. For this analysis, a similar type of facility with an existing drive-thru (City Brew, 1335 Golden Valley Circle, Billings, MT) was used to collect peak data. Order booth and pick-up window service rates were observed, and it was found that the average order booth time was 34-seconds per vehicle and the average pick-up window time was 43-seconds per vehicle. Using the pick-up window time as the limiting factor, a service rate of 1.39 vehicles per minute was utilized to perform the queuing calculations.
Mr. Erik Ringsak, PE February 14, 2024 Page 2 Based on the above information, the queue calculation shows with 95 percent confidence that a queue will not back up to a point where it would begin to impact traffic operations within the site. An expected maximum queue of six (6) vehicles is anticipated due to the 53 vehicles projected to enter the drive-thru during the peak hour. This queue would be contained within the site and would not back up to the order board. The expected maximum queue is also shown on the attached site plan. If you have any questions or concerns, please feel free to contact me at 406-922-4326 or astoltzfus@sandersonstewart.com. Sincerely, Audrey Stoltzfus, PE, RSP1 Project Engineer ARS/jhs Enc. Queuing figure P:24047_TruNorth_Coffee_Shop_2.14.2024