Agenda - Council - 01/11/2022 - Laserfiche WebLink

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Trott Brook Crossing EAW Traffic Study Review January 6, 2022 • Nowthen Boulevard NW / 173rd Avenue NW (Proposed Access) o The side -street delay in the eastbound direction is seven (7) seconds for the a.m. peak and six (6) seconds for the p.m. peak hour. The 95th percentile queues in the eastbound direction are expected to be less than 75 feet, or three (3) vehicles, during the a.m. and p.m. peak hours. Other Considerations and Mitigation SRF is currently engaged with Anoka County on a planning study of Nowthen Boulevard NW and the impacts of potential interchanges along TH 10. Given the planning level nature of the study, it is outside of the scope of the detailed traffic impacts from this housing development. However, as part of the study, a crash review was completed at the Nowthen Boulevard NW intersections with Ramsey Boulevard NW and 167th Avenue NW. At both intersections, the observed crash rate is noted to be above the critical crash rate, indicating that there is statistical significance to the crashes and that mitigation should occur. This mitigation would be outside of the scope of the traffic impact study but will play a role in the long-term traffic operations along the corridor. Additionally, this study is considering the impacts on traffic volumes if/when interchanges along TH 10 are constructed. These impacts may change travel behavior and result in additional volume along Nowthen and Ramsey Boulevards NW, furthering a need for long-term mitigation. Based in the impacts documented above, in short-term conditions there is not expected to be a need for either geometric or traffic control mitigation at the study intersections as a result of the proposed development. While there is an increase in side -street delays at the Nowthen Boulevard NW and Ramsey Boulevard NW intersection, the overall intersection is still expected to operate under capacity and side -street delays of that magnitude are not uncommon in developing areas. Additionally, at the site access locations along Variolite Street and Nowthen Boulevard NW, there is not expected to be any issues with vehicles entering/exiting the proposed development. Under long-term conditions, there could be consideration of traffic control changes or geometric improvements at the Nowthen Boulevard NW intersections with Ramsey Boulevard NW and 167th Avenue NW. The increase or delay at these intersections is a result of a combination of both background and adjacent development traffic and traffic related to the proposed development. As noted within the year 2040 no build conditions, side -street delays were already reaching LOS E conditions regardless of the proposed development. However, as noted above, a planning level study is being completed to determine the long-term configuration of Nowthen Boulevard NW and potential improvements will be detailed within that study. A preliminary review completed as part of this study indicates that the potential improvements at 167th Avenue NW could include eastbound and westbound right -turn lanes and northbound and southbound left -turn lanes. At the Nowthen Boulevard NW and Ramsey Boulevard NW intersection, a traffic control modification to a roundabout could be considered. These improvements would reduce delays and queues to acceptable overall levels. Page 19