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Trott Brook Crossing EAW Traffic Study Review <br />Table 2. Level of Service Criteria for Signalized and Unsignalized Intersections <br />January 6, 2022 <br />LOS Designation <br />Signalized Intersection <br />Average Delay/Vehicle (seconds) <br />Unsignalized Intersection <br />Average Delay/Vehicle (seconds) <br />A <br /><_10 <br /><_10 <br />B <br />> <br />10-20 <br />> <br />10-15 <br />C <br />> <br />20-35 <br />> <br />15-25 <br />D <br />> <br />35 - 55 <br />> <br />25 - 35 <br />E <br />> <br />55-80 <br />> <br />35-50 <br />F <br />> 80 <br />> 50 <br />For side -street stop/yield-controlled intersections, special emphasis is given to providing an estimate <br />for the level of service of the side -street approach. Traffic operations at an unsignalized intersection <br />with side -street stop/yield control can be described in two ways. First, consideration is given to the <br />overall intersection level of service. This takes into account the total number of vehicles entering the <br />intersection and the capability of the intersection to support these volumes. Second, it is important to <br />consider the delay on the minor approach. Since the mainline does not have to stop, the majority of <br />delay is attributed to the side -street approaches. It is typical of intersections with higher mainline traffic <br />volumes to experience high -levels of delay (i.e., poor levels of service) on the side -street approaches, <br />but an acceptable overall intersection level of service. <br />Results of the existing intersection capacity analysis shown in Table 3 indicate that the study <br />intersections currently operate at an acceptable overall LOS A during the a.m. and p.m. peak hours <br />with the existing geometric layout and traffic controls. No significant queuing or delays issues were <br />identified. <br />Table 3. Existing Intersection Capacity Analysis <br />Intersection <br />A.M. Peak Hour <br />P.M. Peak Hour <br />LOS <br />Delay <br />LOS <br />Delay <br />Variolite Street NW / Alpine Drive (1) <br />A/A <br />4 sec. <br />A/A <br />3 sec. <br />Variolite Street NW / 161st Avenue NW (1) <br />A/A <br />4 sec. <br />A/A <br />6 sec. <br />Variolite Street NW / 173rd Avenue NW (1) <br />A/A <br />2 sec. <br />A/A <br />2 sec. <br />Nowthen Boulevard NW / Ramsey Boulevard NW (1) <br />A/A <br />7 sec. <br />A/C <br />15 sec. <br />Nowthen Boulevard NW / 167th Avenue NW (1) <br />A/A <br />6 sec. <br />A/B <br />13 sec. <br />Nowthen Boulevard NW / 173rd Avenue NW (1) <br />A/A <br />4 sec. <br />A/A <br />4 sec. <br />Nowthen Boulevard NW / 175th Avenue NW (1) <br />A/A <br />5 sec. <br />A/A <br />6 sec. <br />(1) Indicates an unsignalized intersection with side -street stop control, where the overall LOS is shown followed by the worst approach <br />LOS. The delay shown represents the worst side -street approach delay. <br />Page 5 <br />