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S' TRAFFIC SOLUTIONS <br />Level of Service <br />Description <br />Delay (sec) <br />Signalized <br />Unsignalized/ <br />Roundabout <br />A <br />Primarily free -flow operation. <br />0-10 <br />0-10 <br />7 <br />----------------- <br />B <br />Reasonably unimpeded operation. <br />>10-20 <br />>10-15 <br />--=-------------- <br />o .., <br />C <br />Stable operation. The ability to maneuver is <br />more restricted than LOS B. <br />>20-35 <br />>15-25 <br />CC <br />-----.---=- ----- <br />"., Lam" <br />D <br />Less stable operation. Small increases in flow <br />may cause large increases in delay and reduced <br />speeds. <br />>35-55 <br />>25-35 <br />-----„--------- <br />E- <br />Unstable operation. Low speeds and <br />considerable delay. <br />>55-80 <br />>35 50 <br />• --1C • 1001 • 001 , * <br />---------------- <br />(J ( <br />Congested operation. High delay and extensive <br />queuing. <br />>80 <br />>50 <br />X� :-_� .�� � „�_ <br />For side street stop -controlled intersections special emphasis is given to providing an estimate for the <br />level of service of the minor approaches. Traffic operations at an unsignalized intersection with side <br />street stop -control can be described two ways. First, consideration is given to the overall intersection <br />level of service. This takes into account the total number of vehicles entering the intersection and the <br />capability of the intersection to support these volumes. Second, it is important to consider the delay on <br />the minor approaches, since the mainline does not have to stop. It is common for intersections with higher <br />mainline traffic volumes to experience increased levels of delay and poor level of service on the side <br />streets. <br />A final fundamental component of operational analyses is a study of vehicular queuing, or the line of <br />vehicles waiting to pass through an intersection. An intersection can operate with an acceptable Level of <br />Service, but if queues from the intersection extend back to block entrances to turn lanes or accesses to <br />adjacent land uses, unsafe operating conditions could result. In this report, the Industry Design Standard <br />95t'' percentile queue length is used. The 951'' Percentile Queue Length refers to that length of vehicle <br />queue that has only a five -percent probability of occurring during an analysis hour. <br />This study has utilized the industry current Synchro/SimTraffic software package (1 I' Edition) to analyze <br />the Existing and Build conditions for the AM peak hour. The results are summarized in Tables 2. <br />4 I P a g e Caribou Coffee, Elk River, MN <br />