06-25-1990 Council Packet - Laserfiche WebLink

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SICaiAL JUSTIFICATION An engineering study including a signal warrant analysis was conducted for this intersection for traffic conditions as they currently exist and with the addition of expected traffic due to planned development in the short term. Data consisted of an 8-hour traffic volume survey conducted in April of 1989 and a copies of two letters from a developer (ETCO Properties. Inc.) to Art Kunze. Mayor of Long Lake, which contain site-specific trip forecasts tor their planned development in the intersection area during 1990 and 1991. Copies of the original survey data, the two traffic forecast letters, and the calculations which estimate the associated increases in traffic on the northbound Willow Drive approach are included in the appendix of this report. A detailed summary of the traffic survey data and signal warrant analysis is given on pages 11-19. Since the posted speed limits on Wayzata Blvd will be 50 raph west of the intersection and 40 mph east of the intersection, the 85th percentile speed will be greater than 40 mph and thus the vehicular volume requirements of Warrants 1. 2. and 8 are reduced from those listed in the .MMUTCD manual by a factor of 30 percent, as is stated in the warrants. Additionally, again due to the higher speeds on Wayzata Blvd, the lower volume requirements of Figures 4-8 and 4-6 apply for Warrant 9 - "Four Hour Volumes" and Warrant 11 — "Peak Hour Volume", respectively. The results of the warrant analysis for existing traffic conditions (as surveyed in April of 1989) are shown in the Traffic Signal Warrant investigation Summary on page 12 and on the graphs for Warrants 9 and 11 on pages 14 and 15. Although traffic volumes on the major street are very heavy (1740 vph during the P.M. peak hour), the current minor street traffic volumes