Agenda Packets - 1997/06/02 - Laserfiche WebLink

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Jim Erickson Glen Van Wormer • John Hagen May 15, 1997 Page 3 Revised work is presented in this memorandum to demonstrate forecast operations at Driveway D and calculated northbound and southbound stacking. Figures 1, 2, and 3 illustrate traffic assignments for the road network under existing, site-generated, and proposed build conditions. Tables 1 and 2 on the following page, show exisiting and proposed traffic assignments. Traffic assignments for the intersection of Highway 10/County Road I were not included on Figures 1, 2, or 3. Biko Associates was advised by Anoka County that this intersection did have to be analyzed in this study. Revised intersection capacity analysis computer print-outs for Intersection A (Highway 10/Silver Lake Road) and Driveways D and E, under the proposed condition, are also included. As presented on the capacity analysis computer print-outs, these three intersections are forecast to operate at acceptable Levels of Service and intersection delays. At Level of Service C, overall intersection delay at 19.1 seconds per vehicle, and with northbound delay calculated at 22.9 seconds per vehicle, the minimum storage length for northbound vehicles is 225 feet. As stated in the traffic study, 170 feet for stacking is available between Intersection A and Driveway D. An additional 160 feet for northbound stacking is available between Driveway D and Driveway E, however; for a total of 330 feet of stacking. According to the Highway Capacity. Manual, the stacking distance for an unsignalized intersection, such as Driveway D, should accommodate the average number of vehicles expected to use the lane in a two minute period. As shown in Table 2, 58 southbound left-turns are expected to occur at Driveway D during the PM peak hour. According to this criterion, and providing 25 feet of stacking distance for each vehicle, a minimum of 50 feet will be needed for queued vehicles. As stated 170 feet is available between the Highway 10/Silver Lake Road intersection and Driveway D. • If queued northbound vehicles block Driveway D, Driveway E will be open. As shown on the site plan in the traffic study, Driveway E provides access to uses proposed for southeast corner of the Highway 10/Silver Lake Road intersection. As explained in the footnote to Table 2, none of the southbound Ieft-turns to the proposed gas station/car wash use were assigned to Driveway E. Instead they were all assigned to Driveway D. Without any of these southbound left-turns assigned to Driveway E, the worst case condition at Driveway D was assumed for the analysis. •