2022-05-03 P & Z Packet - Laserfiche WebLink

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Project Banjo Traffic Study — Regional Analysis Addendum April 22, 2022 Page 23 7) Long -Term: Southbound Left -Turn Lanes along 20th Avenue — the capacity analysis does not indicate a need for southbound left -turn lanes along 20th Avenue at Commerce Drive or Fairview Steet since most site generated trips will use 21s' Avenue to access 1-35E. However, coordination with Anoka County should occur to review the analysis and study findings and determine if these turn lanes should be incorporated from a safety and reduced conflict perspective. 20TH AVENUE TURN LANE SENSITIVITY TEST Based on discussion with project representatives, there were concerns with business impacts associated with potential infrastructure and access changes along 21st Avenue south of Main Street; queuing and turn lane storage were also noted as a concern. Although the capacity analysis did not indicate any major issues, an additional sensitivity test was conducted to understand how changes in development routing could impact infrastructure needs. Since the proposed development has a significant amount of control over their employee and van routing, this sensitivity test was conducted assuming proposed development related traffic was geo-coded/routed via 20th Avenue to access the site, as opposed to 21st Avenue. The analysis focused on the 2040 Build Peak Season during the p.m. peak hour, which represents the highest traffic volume scenario evaluated. The change in routing shifts approximately 300 p.m. peak hour vehicles to 20th Avenue from 21st Avenue (i.e., 200 inbound and 100 outbound), via Main Street. This shift also adds about 100 southbound left -turning vehicles along 20th Avenue at Commerce Drive and Fairview Streets, respectively (assuming both Commerce Drive and Fairview Streets were allowed to be used under a geo-coded scenario). Although the capacity analysis shown in Table 8 does not indicate any capacity issues from a level of services perspective, introducing 100-plus peak hour left -turning movements would warrant constructing southbound left -turn lanes along 20th Avenue at both Commerce Drive and Fairview Street (depending on the geo-coded routing desired). The specific configuration would need to be further evaluated and include other considerations (i.e., road realignments and ped crossings). Table 8 2040 Build Peak Season Sensitivity Test Intersection Traffic Control 2040 Build Peak Season - PM Peak Hour Level of Service (Delay) Original Routing Geo-Coded Routing 201h Avenue / Main Street SIGNAL C (21 sec) C (25 sec) 201h Avenue / Commerce Drive SSS A / B (13 sec) A / B (14 sec) 20th Avenue / Fairview Street SSS A / B (14 sec) A / C (15 sec) 215t Avenue / Main Street SIGNAL C (27 sec) C (25 sec) 215t Avenue / Commerce Drive SSS A / B (13 sec) �_A / B (10 sec) Note that the queueing issues at the 21st Avenue / Main Street intersection are expected to continue, regardless of the proposed development traffic rerouting (see Table 7 sensitivity test). The queues are reduced from the 2040 Build — Peak Season analysis but are still expected to extend beyond the gas station access as previously noted. The westbound left -turn lane at the 20th Avenue / Main Street intersection can accommodate the shift in volumes, but once again, the signal timing would need to be optimized. Therefore, based on this sensitivity test, the geo-controlling of employees and/or vans of the proposed development is a tool that could be leveraged to help mitigate issues, but is not considered a requirement to ensure safe and efficient transportation conditions in the area.