2004-033 Council Resolution - Laserfiche WebLink

Home Search

City of Lino Lakes Legacy at Woods Edge — Traffic Operations Analysis February 11, 2004 Page 2 The 2005 forecast traffic volumes were determined by applying a 1.5 percent per year growth rate to the existing traffic at the ramp intersections and adding the full build -out development traffic to those volumes. The 2010 forecast traffic volumes were determined by applying the 1.5 percent per year growth rate to all volumes including the development volumes. The traffic volumes used in the analysis are consistent with those discussed in the October 23, 2003 memorandum from Glen Van Wormer. The existing and forecast turning movement volumes used in the analysis are attached. Traffic Operations Analysis The evaluation of traffic operations is based on calculations of the volume to capacity ratio (V /c) ratio and average delay per vehicle in seconds per vehicle (s/veh) for intersections. These calculations result in a measure of Level of Service (LOS). The LOS of an intersection is graded on a score of "A" (least delay per vehicle) to "F' (most delay per vehicle). Most major roadways in the Minneapolis /St. Paul metropolitan area typically operate at levels of service in the range of D to E during evening rush hours. A LOS of D is generally acceptable for design. Simulation was used to model traffic over the PM peak hour to determine the average delay per vehicle and the related LOS for each intersection and approach. Another critical element of traffic operations analysis is queuing - the distance that approaches to an intersection "back -up" with vehicles. Simulation reported the maximum queues for the intersections and the animation was reviewed to determine how the queues impacted operation. The LOS for the intersections analyzed are shown in Table 1 and the maximum queues as compared to available or proposed storage are shown in Table 2 (attached). Also reviewed were critical lane volumes per the methods in the Mn/DOT Traffic Signal Timing and Coordination Manual. This analysis reviews the critical turning movement volumes at intersections for the purpose of determining the general capacity sufficiency of a signalized intersection. Existing 2003 Turning movement volumes conducted by Mn/DOT on December 3, 2003 at the I -35W ramp intersections with Lake Drive were used in conjunction with turning movements obtained from trip generation for the existing development in Legacy at Woods Edge and the existing gas station in the southwest quadrant of the interchange. A field review of existing traffic operations was conducted during the PM peak hour on Tuesday January 20, 2004. The simulation of existing traffic operations showed results similar to the field review. The Northbound I -35W ramps are currently offset at Lake Drive. The Northbound I -35W exit ramp showed a maximum standing queue of 12 vehicles during the field observation and the simulation showed a maximum standing queue of 7 vehicles or 140 feet. The existing LOS for the exit ramp approach to the intersection is LOS A. It was observed in the field that the exiting vehicles do receive gaps in traffic caused by the platooning of vehicles from the traffic signal at Apollo Drive and Lake Drive. These gaps allow the exiting vehicles to make their movements without excessive delay. The LOS for the approaches to each of the three intersections is at LOS C or better. 2005 No -Build This analysis showed system failures under the 2005 Build forecast traffic volumes and existing geometric and intersection control conditions. The intersection of Lake Drive with the Northbound I -35W