Agenda - Planning Commission - 08/02/2018

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North Dayton Development AUAR Accounting for additional traffic from the proposed development, the following mitigation will also be necessary to accommodate the full projected 2025 volumes: • Construct a single -lane roundabout at the Dayton River Road/Pineview Lane intersection, reserving right-of-way for future right turn lanes, or a traffic signal with dedicated turn lanes. Hennepin County prefers dedicated turn lanes at its county road intersections and could request them at the proposed development key access intersections. Three study intersections are considered these key access points with entering and exiting traffic from the development: Dayton River Road/River Hills Parkway, Dayton River Road/Vicksburg Lane, and North Diamond Lake Road/Zanzibar Lane. Although the capacity analyses suggest no improvements are necessary, the County may still request dedicated turn lanes at these intersections. Beyond year 2025, the long-range time frame and uncertainty of potential developments, roadway network, and travel patterns result in multiple assumptions for this analysis. Due to this inherent uncertainty, year 2040 recommendations should not be constructed today. Instead, right-of-way should be preserved for these needs when required based on actual traffic growth. The following modifications to the study roads and intersections, assuming the planned roadway network is implemented, are recommended for the year 2040 to address potential issues due to general background growth and other specific development traffic with or without the proposed North Dayton site: • Continue to work on long-term solutions with other agencies to accommodate future congestion on the TH 169 and CSAH 81 corridors. • Construct a multi -lane roundabout at the Dayton River Road/South Diamond Lake Road intersection, with two-lane Dayton River Road approaches, or a traffic signal with dedicated turn lanes. • Construct single -lane roundabouts or traffic signals with dedicated turn lanes at the intersections of 129th Avenue/Pineview Lane, Dayton River Road/Brockton Lane, and South Diamond Lake Road/Pineview Lane. • Continue to update signal timing at all signalized intersections at least every three to five years. With the North Dayton proposed development traffic contributing to the study area volumes, the following additional 2040 mitigation is recommended: • Provide dedicated right turn lanes for the Dayton River Road/Pineview Lane intersection single - lane roundabout using the reserved right-of-way if a roundabout was constructed as part of the 2025 mitigation. • Construct a single -lane roundabout or a traffic signal with dedicated turn lanes at the N Diamond Lake Road/Zanzibar Lane intersection. • Construct multi -lane roundabout at the Dayton River Road/N Diamond Lake Road intersection, with two-lane Dayton River Road approaches, or a traffic signal with dedicated turn lanes. 35