7.2.B. SR 06-19-2017 - Laserfiche WebLink

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Andrew Witter, Sherburne County April 25, 2017 CSAH 1 and MN Highway 10 Traffic Review [3] Alternatives Configurations County staff provided four alternative configurations along CSAH 1 (north of MN Highway 10), which were evaluated from an intersection capacity and queuing perspective. Results of the analysis indicate that the study intersections are expected to operate at an acceptable overall intersection level of service during the a.m. and p.m. peak hours for all alternatives. All alternatives significantly reduce southbound queuing during the p.m.peak hour.However,for all alternatives the sight-distance should be further evaluated for eastbound left-turns at the proposed roadway. Changes to delays and queues at the northbound, eastbound, and westbound approaches of the CSAH 1/MN Highway 10 intersection are not expected to significantly change from existing conditions. The following summarizes the operations for each alternative,which are illustrated in the Appendix. Alternative 1 14) While the southbound left-turn queues are expected to improve during the a.m. peak hour, queues are expected to continue to frequently queue beyond the North Shell Access and occasionally to the railroad tracks. Alternative 2 15) Alternative 2 is expected to improve southbound queuing compared to Alternative 1. Southbound queues are expected to extend beyond the South Shell Access/Proposed Roadway approximately 10 percent of the a.m. peak hour and five (5) percent of the p.m. peak hour. 16) With the split phasing for the northbound and southbound approaches, the overall delay at the CSAH 1/MN Highway 10 intersection increases. Alternative 3 17) Similar to Alternative 1, southbound left-turn queuing is expected to frequently extend beyond the North Shell Access and occasionally extend to the railroad tracks during the a.m. peak hour. Without access to the South Shell Access via the southbound approach, more storage space is available. 18) Due to the extended median in Alternative 3,westbound left turn vehicles at the existing South Shell Access were rerouted to the North Shell Access,which results in higher delays. Alternative 4 19) Due to safety, queuing,and operational issues,the CSAH 1/MN Highway 10 intersection along with the U-turn movements to the east and west were evaluated as signalized intersections. 20) The Southeast Shell Access was assumed to be closed under this alternative. 21) This alternative provides the lowest overall delay at the CSAH 1/MN Highway 10 intersection compared to the other alternatives evaluated.