Agenda - Council - 06/13/2017 - Laserfiche WebLink

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All 95th percentile queues remain at or below four vehicles per approach while delays remain significantly below the LOS D/E boundary for all intersection except TH 10/Alpine Drive. TH 10/Alpine Drive does experience PM queues and delays above the preferred threshold. Projecting the volumes to the 2040 No -Build scenario increase these concerns with the intersection breaking down in the 2040 PM No -Build scenario, operating with 95th percentile queues of 11 vehicles for southwest bound vehicles on Alpine Drive and LOS F for the approach. Also, the left turning vehicles begin to have issues completing their movements due to very heavy through movements along TH 10. Based on these results the Peak Hour Signal Warrants were checked to determine if signalized traffic control is warranted for the intersection. With AM and PM mainline 2040 No -Build volumes above 3,000 vehicles per hour the cross -street volume threshold to warrant a traffic signal is only 100 vehicles per hour. Both the AM and PM No -Build and Build scenarios meet this threshold, with the projected volumes, which suggests the intersection would benefit from signalized traffic control. By installing traffic signal control, gaps in mainline traffic would be produced providing additional time for left turning and U-turning vehicles to safely complete their movements on TH 10. Also, the signal would provide green time for Alpine Drive allowing the queues to clear and prevent excessive backups. It is important to note that the traffic signal would add delay to TH 10 mainline, which is not preferred along arterial roadways. It is also important to note that due to the extended 2040 forecast year, and due to additional volumes based on anticipated, but not guaranteed, developments within the area, these upgrades are not needed immediately upon Capstone Homes construction. Because the volumes are heavily weighted by the additional developments within the area additional monitoring of the TH 10/Alpine Drive intersection should occur as the anticipated developments are added to the area to determine when intersection volumes rise above the Eight - Hour Traffic Warrant. Turn -Lane Warrants were also checked at each of the site accesses to determine if any additional turn treatments are required. With the existing low speed along Alpine Drive and Puma Street, the Turn -Lane Warrants published by MnDOT will not be fulfilled, as a 45 MPH minimum speed limit is not present on either roadway. The 30 MPH speed limit is consistent for a neighborhood street. A preliminary Turn -Lane Warrant analysis was completed based on volumes alone, ignoring the 45 MPH minimum speed requirement as well as sight line/sight distance checks at each access. Traffic Impact Study 9 Capstone Homes Residential Development NSULTIING