Agenda - Council - 10/24/2023 - Laserfiche WebLink

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signal-controlled intersections might be necessary, especially regarding timing. The signal timings were optimized when the 2040 builds were run but the phasing and cycle length were unchanged. Some of the left-turn movements are anticipated to see an increase in delay due to the site traffic with a few operating at LOS E. No individual movement is anticipated to operate at LOS F and the movements that operate at LOS E generally saw only a modest increase in delay as a result of the added site traffic. The only intersection to operate at a LOS lower than D is the intersection of CSAH 5 & Iodine Street, specifically the westbound left turn movement which is primarily site traffic exiting the development. This level of delay is expected considering the high number of vehicles traveling southbound along CSAH 5 in the AM and is not of high enough concern to justify any major mitigation changes. Traffic patterns at this intersection should be observed in the future in case the traffic generated by the development is higher than estimated. The project could also exacerbate the aforementioned issue with the left turns at the MN-47 &Sunwood Dr intersection, since these movements show higher delays and in some cases LOS when compared to the 2040 No-Build Scenario. The SimTraffic reports are provided in Appendix D. TURN LANE WARRANT AT NORTH SITE ACCESS While the operations at the north site access are acceptable in all analysis scenarios, turn lane warrants were analyzed for the intersection in the build condition as the access is proposed to be converted from an exit only to right in/right out. The necessity of northbound right turn lane at CSAH 5 and the north site access was analyzed using NCHRP Report 457 - Evaluating Intersection Improvements: An Engineering Study Guide. CSAH 5 has a posted speed limit of 50 mph. The guidelines from NCHRP Report 457 recommend that if the plotted volumes are to the right of the curves for the speed of the major road listed, a right turn lane be considered. The PM Peak hour is the highest of the three peak hours in terms of volumes at the intersection. Table 8 summarizes the results from Figure 2-6 from NCHRP Report 457. A northbound right turn lane is not warranted in 2027 or 2040. Table 8- Right-Turn Lane Warrants Major Road Right Turn Limiting Right Turn Condition Volume Volume Right TurnWarranted (veh/h) (veh/h) VolumeYes/no? (veh/h) 2027—PM Peak Hour 442 5 28 No 2040—PM Peak Hour 496 5 25 No While a northbound right turn lane is not warranted, Anoka County has expressed a desire to have a northbound right turn lane installed at the access. Haviland Fields-Ramsey, MN Traffic Impact Analysis I October 2023