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Building a Better World <br />for All of Us° <br />March 21, 2017 <br />Mr. Bruce Westby, PE <br />City Engineer <br />City of Ramsey <br />7550 Sunwood Drive Northwest <br />Ramsey, Minnesota 55303 <br />Dear Mr. Westby: <br />RE: Ramsey, Minnesota <br />CSAH 83 at Sunwood Drive/147th <br />Avenue NW Signal System <br />Flashing Yellow Arrow <br />Considerations <br />SEH No. RAMSY 141224 <br />As requested, we reviewed the intersection of CSAH 83 (Armstrong Boulevard) and Sunwood <br />Drive/147th Avenue Northwest with regards to proposed modification of the existing intersection <br />traffic signal left turn operations. Recently, the City has received requests to have flashing <br />yellow arrow operation installed and activated at this intersection. In response to these requests, <br />the City had SEH perform an analysis of the intersection to determine if flashing yellow arrow <br />operation can be utilized here. The analysis would include review of the feasibility, cost, and <br />safety of the intersection for flashing yellow arrow operations. Following is the results of our <br />analysis. <br />This 4-legged intersection was signalized in January 2013 (prior to when the adjacent Trunk <br />Highway 10-CSAH 83 intersection was reconstructed with an interchange), with protected left <br />turn phasing installed for all approaches. The posted speed limit on CSAH 83 is 55 mph, while <br />both Sunwood Drive and 147th Avenue Northwest are posted at 30 mph. The northbound and <br />southbound CSAH 83 approaches and the eastbound 147th Avenue Northwest approaches each <br />have a single left turn lane, while the westbound Sunwood Drive approach has a dual left turn <br />lane. Single through lanes and separate right turn lanes exist on the side street approaches, while <br />each CSAH 83 approach has two separate through lanes and a separate right turn lane <br />approaching the intersection. The intersection is located approximately 'A mile east of the Trunk <br />Highway 10/CSAH 83 interchange area, with a significant east -to -south horizontal curve for <br />northbound CSAH 83 traffic from the interchange area to where a full left turn lane exists for <br />traffic approaching Sunwood Drive/147th Avenue Northwest. <br />SEH obtained peak hour turning movement traffic counts on September 29, 2016, several <br />months after the Trunk Highway 10-CSAH 83 interchange area was opened and area traffic <br />patterns were able to stabilize, in order to properly analyze existing traffic conditions. SEH <br />Engineers I Architects I Planners I Scientists <br />Short Elliott Hendrickson Inc., 3535 Vadnais Center Drive, St. Paul, MN 55110-5196 <br />SEH is 100% employee -owned 1 selline.com 1 651.490.2000 I 800.325.2055 I 888.908.8166 fax <br />