04-25-2018 Council Packet - Laserfiche WebLink

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Traffic Impact Study Little Canada Caribou Coffee Alliant No. 218-0047.0 8 April 11, 2018 Results of the trip generation estimates indicate the proposed development is expected to generate approximately 161 a.m. peak hour, 79 p.m. peak hour, and 1,486 daily trips. It should be noted that a significant portion of these generated trips are expected to be from motorists already traveling within the study area, primarily along Little Canada Road, who will now divert their trip to the proposed development before continuing to their destination (i.e. pass-by/diverted link trips). Pass-by/diverted link trip percentages for the proposed land use were referenced in the ITE Trip Generation Manual to arrive at a pass-by/diverted link trip reduction of 80 percent. Taking into account the pass-by/diverted link trip reduction, the resultant net new traffic volume impact to the adjacent roadway network is estimated to be approximately 33 a.m. peak hour, 15 p.m. peak hour, and 298 daily trips. 4.3 Trip Distribution and Assignment The distribution of site-generated traffic was estimated based on a review of existing traffic volumes/patterns and engineering judgement. The estimated directional distribution is shown in Figure 5. These trip distribution percentages were applied to the estimated site-generated traffic volumes to forecast year 2020 conditions. The resultant year 2020 traffic forecasts are shown in Figure 6. 4.4 Intersection Capacity Analysis To understand the extent to which the proposed development impacts the study area roadway network, the forecasted year 2020 conditions were analyzed using Synchro/SimTraffic software. Results of the year 2020 intersection capacity analysis presented in Table 5 indicate that the I-35E Southbound Ramps/Little Canada Road/Country Drive study intersection is expected to operate at overall LOS D during the a.m. and p.m. peak hours without signal timing or geometric improvements. While little operational impact is expected on the southbound I-35E Exit Ramp approach, the southbound Country Drive approach will experience increased del ay and queueing without proper mitigation (i.e. signal timing adjustments). Whereas the southbound Country Drive movements currently operate unopposed, outbound proposed development traffic will conflict with southbound Country Drive movements in the future condition. No other significant delay or queueing issues were observed in the traffic simulation. Detailed operations and queuing analysis results are presented in Appendix A. Table 5 – Year 2020 Intersection Capacity Analysis I-35E Southbound Ramps/ Little Canada Road/ Country Drive Traffic Signal 2020 D /F 40.0 /145.9 D /E 35.4 /64.2 Overall Intersection LOS / Worst Approach LOS Overall Intersection Delay / Worst Approach Delay Intersection Traffic Control Year AM Peak Hour PM Peak Hour LOS Delay (s)LOS Delay (s)