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SEH <br /> Building a getter World for All of Us' <br /> March 21, 2017 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 /> 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 /> As requested, we reviewed the intersection of CSAH 83 (Armstrong Boulevard) and Sunwood 'y <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 /> y <br /> analysis. <br /> This 4-legged intersection was signalized in January 2013 (prior to when the adjacent Truk <br /> Highway 10-CSAH 83 intersection was reconstructed with an interchange), with protected left <br /> g y <br /> turn phasing installed for all approaches. The posted speed limit on CSAH 83 is 55 mph, while <br /> p r <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 /> g g <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 1/4 mile east of the Trunk <br /> pp g <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 /> pp g <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 ( Planners Scientists <br /> Short Ei6ioe-k Hen&ickson mice,3535 Vadnais Center Drive,St.Paul,IVIN 551:1.0-5196 <br /> SEH is 100%employee-owned sehinc.conn I 651.E-90.2000 800.325.2055 I 888.908.8166 fax <br />