2009-02-25 CC Packet - Laserfiche WebLink

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2008 volume conditions. Warrants lA, 1B, 2 and 3B are satisfied under year 2030 forecasted volume conditions. Traffic signal control is warranted at the CSAH 14/21" Avenue intersection by satisfying the requirements of Warrants 1B, 2 and 3B under year 2013 forecasted volume conditions and Warrants lA, IB, 2 and 3B are satisfied under year 2030 forecasted volume conditions. . Capacity Analysis The two reconstructed traffic signal controlled CSAH 14/1-35E ramp intersections and the reconstructed traffic signal controlled CSAH 14/21" A venue intersection are anticipated to operate at acceptable levels of service under both existing year 2008 and year 2030 forecasted volume conditions. It is anticipated the intersections would not operate acceptably when all-way stop controlled for year 2030 forecasted volume conditions. . Right-of-Way Considerations Based on the revised interchange configuration, additional right -of-way is already required to accommodate the loops and the additional distance between the ramp intersections. In order to determine the actual right-of-way impacts as a result of installing roundabouts, the size of the roundabouts would need to be determined to see if additional right-of-way would be required. . Transportation System Considerations Installing traffic signal control at the reconstructed CSAH 14/1-35E ramp intersections and the reconstructed CSAH 14/21" Avenue intersection will allow for the intersections to operate as a coordinated system within the interchange area. This will allow for coordination for heavy movements during the peak hours, which reduces vehicular delay and controls the queuing interaction among the intersections along CSAH 14. Based on the aforementioned conclusions, traffic signal control is recommended at the reconstructed CSAH 14/I-35E ramp intersections and the reconstructed CSAH 14/21" Avenue intersection, as shown in the MnlDOT Levell layout (SRF Consulting Group, Inc., May 2008). This recommendation is consistent with previous studies for the interchange reconstruction project. It is recommended to operate the traffic signal controlled CSAH 14/1-35E ramp intersections as a system with the closely spaced adjacent traffic signal controlled intersections on CSAH 14 to minimize the impacts to the transportation system by providing coordination for heavy movements during the peak hours. Roundabout control was considered in previous studies but has been eliminated because of the proposed interchange configuration. The traffic signals at the at the reconstructed CSAH 14/I-35E ramp intersections and the reconstructed CSAH 14/21" Avenue intersection will be operated and maintained by MnlDOT. An agreement will be executed where the costs associated with operating and maintaining the CSAH ] 4/21" Avenue intersection will be reimbursable by Anoka County. ~CONS{'!l.'flNG GROVP, lNC. - 17- January 30, 2009 34