Agenda Packets - 1997/04/28 - Laserfiche WebLink

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INTERSECTION CAPACITY ANALYSIS Analysis was conducted in this study to determine intersection capacity at two intersections, Highway 10/Silver Lake Road and Driveway D/Silver Lake Road. The capacity analysis considered both existing and proposed conditions for the Highway 10/Silver Lake Road intersection. The analysis evaluated intersection level of service (LOS), which is a measure of the average stop delay vehicles experience at stop sign-controlled and signalized intersections. LOS A represents the shortest delay, and LOS F represents extremely long delays and congestion. LOS A, B, C, and D are acceptable, LOS E is tolerable, and LOS F is unacceptable. Results of the capacity analysis, detailed in the Appendix, show that the Highway 10/Silver Lake Road intersection currently operates at LOS C. The addition of traffic that would be generated by the proposed development would not negatively affect capacity at this intersection, and under the proposed condition, LOS C is maintained. The analysis also showed that the intersection formed by Driveway D with Silver Lake Road will operate at LOS A under the proposed condition. ON-SITE CIRCULATION Location of Driveways and Access Operations As presented on the site plan(Figure 2), three access driveways are proposed to be located on Highway 10. The centerline of Driveway A, the westernmost access point on Highway 10 is shown on the site plan to be 270 feet from the centerline of Silver Lake Road and 210 feet from the curb return. This access point exists today at a • distance of 180 feet from the curb return and serves a structure (an office) that will be demolished and cleared to implement the proposed project. It has been relocated to the east 30 feet to bring it closer to the Mn/DOT standard, 300 feet. Driveway D is shown on the site plan to be the northernmost access point on Silver Lake Road. As shown, this driveway will be directly aligned with an existing driveway that serves the gas station west of the proposed development site. Driveway F, directly south od Driveway D, provides access to an internal loop road. The loop road would permit movement between on-site uses; e.g., the gas station and the restaurant. The loop road is not intended to be used as a short-cut to avoid the intersection of Highway 10 and Silver Lake Road. Instead, its inclusion in the design of the site supports one of the purposes of PUDs, the ability to travel between on-site uses while minimizing impacts to the adjacent road system. Vehicle Stacking A consequence of vehicles waiting at an intersection is queuing or stacking. Analysis was conducted to determine if, under the proposed condition, the distance provided for queued vehicles would be adequate to prevent the northernmost access point, Driveway D, from being blocked. Driveway D is 170 feet south of the Highway 10 curb return. The analysis indicated that a minimum of 225 feet would be required for northbound vehicle stacking, and the available distance for stacking is 55 feet(approximately two stacked car lengths) short. This shortage, however, should be weighed against five factors: -16-