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2017-05-10 CC Packet
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2017-05-10 CC Packet
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-A <br />SEH <br />Building a Better World <br />for All of Us® <br />October 12, 2015 <br />Ms. Jane Rose <br />Traffic Engineering Manager <br />Anoka County Highway Department <br />1440 Bunker Lake Boulevard NW <br />Andover, Minnesota 55304 <br />Dear Jane: <br />RE: Anoka County, Minnesota <br />CSAR 14 at CSAR 54 Signal System <br />Flashing Yellow Arrow Considerations <br />SEH No. ANOKC 122928 <br />As requested, we reviewed the intersection of CSAR 14 (Main Street) and CSAH 54 (201s Avenue North) <br />in the Cities of Centerville and Lino Lakes with regards to proposed modification of the existing <br />intersection traffic signal left turn operations. Recently, the County has received requests from the public <br />to have flashing yellow arrow operation installed and activated at this intersection. In response to these <br />requests, the County had SEH perform an analysis of the intersection to determine if flashing yellow <br />arrow 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 analysis. <br />This 4 -legged intersection was first signalized in 2007, with protected left turn phasing installed for all <br />approaches. The posted speed limit on CSAH 14 is 45 mph, while the north leg of CSAH 54 is posted at <br />55 mph and the south leg of CSAH 54 is posted at 50 mph. All iptersection approaches have a single <br />separate dedicated left turn lane, except that the southbound CSAH 54 approach has a dual left tum lane. <br />The County provided SEH with limited turning movement traffic count information (completed for 9:30- <br />11:00 am on April 8, 2007). However, we had concerns about the traffic volumes shown on this count <br />summary for this time of day given local development and typical area traffic patterns, as well as the age <br />of the count itself. The southbound CSAR 54 left and right turning traffic volumes for 10:00-11:00 am <br />were much higher than would be anticipated for this area. To address these concerns, SEH performed an <br />AM and PM peak hour traffic count during the week of October 5-9, 2015. An AM peak hour traffic <br />count was taken on Wednesday, October 7, 2015 between 7:00-8:00 am while a PM peak hour traffic <br />count was taken on Monday, October 5, 2015 between 4:00-5:00 pm. As shown on the attached count <br />summary, current peak hour traffic volumes were much lower for all movements to and from the north <br />(eastbound left turns, westbound right turns, and all southbound movements) than shown on the 2007 <br />count. For our analysis of the intersection, we utilized the 2015 counts but also will mention the 2007 <br />count in our review. <br />SEH also obtained crash data for the intersection for the most recent 3 years of available crash data (2012- <br />2014) from the State's crash website. SEH then completed a brief field review of the signal system to <br />confirm that the existing traffic signal plans correspond to the current installation of the signal system and <br />take into account , the current intersection geometrics. SEH also reviewed traffic signal cabinet <br />Engineers I Architects I Planners I Scientists <br />.Short Elliott Hendrickson Inc., 3535 Vadnais Center Drive, St. Paul&MN.55110-5196 <br />SEN is 100% employee -owned I sehinc.com I 651.490.2000 I 800.325.2055 � �r •8$8.908.8166 fax <br />123 <br />
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