Agenda - Planning Commission - 08/02/2018

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sufficient). Based on these analyses, the following improvements are recommended to provide acceptable operations with reasonable queuing: Corridors: The TH 169 and CSAH 81 were discussed earlier, noting that many agencies have recognized the existing congestion and expected continued congestion due to increases in traffic from regional development. The City of Dayton is recommended to continue working with other agencies to identify spot improvements and long-term upgrades for safe and acceptable operations into the future. Intersection: Dayton River Road/TH 169: The addition of a second dedicated eastbound left turn lane, resulting in two dedicated eastbound left turn lanes and one shared through -left turn lane, from Dayton Road onto TH 169, decreases delays at the intersection. While not bringing operations back into an acceptable range, the delays are significantly reduced with this improvement. Additional pavement between this intersection and the river crossing bridge will be needed for the three left turns to merge before the two northbound lanes over the bridge. Chart 2 and Chart 3 show the a.m. and p.m. mitigated delays are reduced. As noted, additional improvements will likely be necessary for the corridor with or without this proposed development. N Diamond Lake Road/Brockton Lane: As previously mentioned, N Diamond Lake Road/Brockton Lane begins to operate at LOS F during the 2025 No -Build p.m. peak period due to the increase in vehicles along N Diamond Lake Road. However, the a.m. peak hour operates within the acceptable limits up the to 2025 developer preferred land use. These results suggest that a traffic signal would cause un-needed stoppages in traffic flow outside the p.m. peak hour and may decrease overall efficiency of the intersection over a full day. For these reasons a single -lane roundabout is recommended for the intersection. As Chart 4 and Chart 5 shows, the LOS is improved to a LOS A in the a.m. peak hour and LOS C in the p.m. peak hour. Also, outside of the peak periods, vehicles will not need to stop at the intersection and wait for a green light with little or no conflicting traffic as the roundabout does not have the lost -time that a traffic signal would. While a roundabout is preferred, a traffic signal is an acceptable option. With dedicated turn lanes, a traffic signal would operate at an overall LOS B or better during the peak periods. As both Brockton Lane and N Diamond Lake Road are County Roads, separated left and right turn lanes may be required, though not needed for capacity reasons. Traffic Impact Study 16 North Dayton Development 12IM CONSULTING