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-� Debra Bloom, P.E. City of Roseville Operations Analysis October 29, 2007 Page 3 The report indicates that the analysis was completed using the Synchro analysis software. This software is an acceptable tool to analyze traffic operations. However, it is a macroscopic model that has limitations in analyzing the queuing at intersections. Using a microscopic model, such as SimTraffic in addition to Synchro would provide a more detailed analysis of the full impact of queuing and blocking, as well as capture the effects of vehicle platoons arriving from coordinated signal systems. Generally, microscopic models such a SimTraffic are more realistic, since they model vehicles individually through the various traffic control systems. As discussed in the previous bullet, the operations analysis may not be accurately accounting for multiple contributing factors to the overall intersection operations. Review of the critical movements at the intersection of Snelling Avenue/CR B indicate that the intersection is over its capacity limit under existing conditions yet is being reported as an acceptable Level of Service (LOS) D. While the critical lane capacity review method used for comparison purposes is merely a planning level review technique, it is valid in determining a level of potential operation and indicates that the analysis methodology used in the traffic study may need to be confirmed with another source (i.e., SimTraffic simulation). Mn/DOT has plans in place to improve Snelling Avenue through the intersections at the Har Mar Mall entrance and County Road B. These geometric improvements were not included in the future conditions analysis. Under future build conditions, the intersection of Snelling Avenue/County Road B is shown to operate at an acceptable LOS D with a delay of 53.5 seconds, which is 1.5 seconds below the LOS D/E threshold. If the trip estimates for the proposed redevelopment of the mall are low or there is background growth in the area that was not accounted for, this intersection could easily fall into the LOS E threshold. As mentioned, there are improvements identified by the City for this intersection that would provide additional capacity. The operations analysis should be revised to include the proposed improvements and include a thorough review of the queue interaction along Snelling Avenue as well (under all conditions). Please note that there is an error in the volume reported for the northbound right-turn movement at the intersection of CR B/Har Mar Mall Access (east), under year 2009 build conditions. The volume reported is 156 vehicles, however the existing and year 2009 no build conditions present volumes that are approximately 100 vehicles less that this value. It is assumed that this value is in error. Please update in text/graphics and the analysis.