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Stop Sign Memo <br />June 21, 2017 <br />Page 3 <br /> <br /> <br />G:\Group Data\Traffic\Arden Hills\Chatham Ave & Mccraken Ln\Arden Hills Stop Sign Request Memo.doc <br />3. If the 85th percentile approach speed of the major street traffic exceeds 40 MPH, the <br />minimum vehicular volume warrant is 70 percent of the above values. <br /> <br />A speed study was not performed at this intersection, but both roads currently have at speed limit <br />of 30 MPH and 85 th percentile speeds exceeding 40 MPH would not be expected. <br /> <br />Where no single criterion is satisfied, but where criteria B, C.1, and C.2 are all satisfied to 80 percent of <br />the minimum values. Criterion C.3 is excluded from this condition. <br /> <br />Criteria B, C.1, and C.2 are not satisfied to 80 percent of the original minimum values stated previously. <br /> <br />D. Pedestrian Volumes <br />Pedestrian volumes at this intersection are assumed to be higher than normal for a residential <br />neighborhood. This is mostly related to the children crossing to or from the school bus stops. During the <br />AM peak hour, seven pedestrians were counted within the intersection. During the PM peak hour, eight <br />pedestrians were present. There are no sidewalks within the intersection quadrant, and no pedestrian <br />signs are posted nearby. <br /> <br />F. Sight Distance 1 <br />Exhibit 9-51 (Table 1 ) from AASHTO’s Geometric Design of Highways and Streets displays the sight <br />distance travel by an approaching vehicle as a function of the design speed of the roadway on which the <br />uncontrolled intersection approach is located. Based on the speed limit of 30 MPH for both Chatham <br />Avenue and McCracken Lane, 140 feet of sight distance is needed to safely permit the vehicles on either <br />road to stop, if necessary, before reaching the intersection. The existing geometry does not currently <br />provide adequate sight lines for an uncontrolled intersection. However, low volumes on these roadways <br />combined with the current travel patterns for most vehicles, has resulted in very few conflicts at the <br />intersection with no recorded crashes. <br /> <br />Table 1. Sight Distances Based on Design Speeds <br /> <br /> <br />1 Based on procedures and values found in “A Policy on Geometric Design of Highways and Streets” (2004) by the American <br />Association of State Highway and Transportation Officials (AASHTO).