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No -Build scenario during the p.m. peak hour. As these delays are only present <br />during the p.m. peak period, a single -lane roundabout is recommended for <br />mitigation and results in p.m. peak build period operation of LOS B. <br />A four -phase traffic signal with single approach lanes is sufficient to handle the <br />volumes as well and results with LOS A operations. However, turn lanes may be <br />required or desired beyond capacity reasons. <br />Dayton River Road/N Diamond Lake Road and Dayton River Road/S <br />Diamond Lake Road: The side street stop control at these intersections begin <br />to experience unreasonable queueing by the 2040 build scenarios. Much like <br />Dayton River Road/Pineview Lane, these delays are due to the increased <br />mainline volumes creating lack of gaps for cross street movements. Multi -lane <br />roundabouts are recommended at these intersections with shared through -right <br />and through -left layouts along Dayton River Road. This layout provides sufficient <br />capacity for the increased Dayton River Road volumes while still allowing cross <br />street vehicle progression. Chart 11 and Chart 12 show the corresponding LOS <br />under the roundabout mitigation. <br />Traffic signals can be installed to accommodate the 2040 volumes if sufficient <br />approach lanes are provided. Dedicated left turn and right turn lanes are required <br />for Dayton River Road approaches with the potential need for an additional <br />through lane for the S Diamond Lake Road intersection (not the full corridor) and <br />dual northbound left turn lanes for the N Diamond Lake Road intersection. <br />S Diamond Lake Road can operate as a single lane westbound and shared left <br />turn/through lane with dedicated right turn lane for eastbound traffic. The <br />N Diamond Lake Road approach will need dedicated left turn and right turn lanes <br />while the opposing approach of 142nd Avenue only needs a single lane for <br />capacity purposes. Additional dedicated turn lanes for several approaches may <br />be required beyond capacity reasons. Chart 9 and Chart 10 show the signalized <br />mitigation results. <br />Dayton River Road/Brockton Lane, N Diamond Lake Road/Zanzibar Lane, <br />and 129th Avenue/Pineview Lane: The side street stop control at these <br />intersections begin to experience unreasonable queueing during the 2040 No - <br />Build scenario for 129th Avenue/Pineview and Dayton River Road/Brockton Lane <br />and during the 2040 build scenario at N Diamond Lake Road/Zanzibar. Single - <br />lane roundabouts provide sufficient traffic flow and reduce delays to LOS C or <br />better at all the intersections under the preferred developer land use. Chart 11 <br />and Chart 12 present the mitigated delays for these intersections. <br />If signalized intersections are preferred, the following can be implemented: <br />i. Dayton River Road/Brockton Lane — Three phase signal with dedicated <br />turn lanes on all approaches. <br />ii. N Diamond Lake Road/Zanzibar Lane — Four phase signal with dedicated <br />turn lanes on N Diamond Lake Road while the Zanzibar Lane approaches <br />Traffic Impact Study 25 <br />North Dayton Development <br />12IM CONSULTING <br />