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<br />[DRAFT] Intersection Control Evaluation SRF Consulting Group, Inc. <br />County Road E at Snelling Ave N (CR 76) 3 November 30, 2021 <br />Intersection Capacity Analysis <br />An existing intersection capacity analysis was completed for the weekday a.m. and p.m. peak hours to <br />establish a baseline condition to which future traffic operations can be compared. The study <br />intersection was analyzed using Synchro/SimTraffic (Version 11). <br />Capacity analysis results identify a Level of Service (LOS), which indicates the quality of traffic flow <br />through an intersection. Intersections are given a ranking from LOS A through LOS F. The <br />LOS results are based on average delay per vehicle, which correspond to the delay threshold values <br />shown in Table 2. LOS A indicates the best traffic operation, with vehicles experiencing minimal <br />delays. LOS F indicates an intersection where demand exceeds capacity, or a breakdown of traffic <br />flow. Overall intersection LOS A through LOS D is generally considered acceptable on roadways in <br />the Twin Cities Metro Area. <br />Table 2. Level of Service Criteria for Signalized and Unsignalized Intersections <br />LOS Designation Signalized Intersection <br />Average Delay/Vehicle (seconds) <br />Unsignalized Intersection <br />Average Delay/Vehicle (seconds) <br />A ≤ 10 ≤ 10 <br />B > 10 - 20 > 10 - 15 <br />C > 20 - 35 > 15 - 25 <br />D > 35 - 55 > 25 - 35 <br />E > 55 - 80 > 35 - 50 <br />F > 80 > 50 <br />Results of the existing intersection capacity analysis shown in Table 3 indicate that the study <br />intersection currently operates at an acceptable overall LOS A and LOS B during the weekday a.m. <br />and p.m. peak hours, respectively, with the existing geometric layout and traffic controls. No <br />significant delay or queuing issues were identified based on the collected traffic volumes. Anecdotally, <br />traffic operations begin to breakdown if traffic volumes increase marginally from an average day and <br />there can be longer queues and delays based on daily traffic fluctuations. <br />Table 3. Existing Intersection Capacity Analysis <br />Intersection A.M. Peak Hour P.M. Peak Hour <br />LOS Delay LOS Delay <br />County Road E/Snelling Avenue N A 7 sec. B 14 sec. <br />