Agenda - Public Works Committee - 10/19/2021

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; i. Mr.Bruce Westby,PE March 211,2017 Page 3 I� k. traffic in the AM peak hour and for westbound traffic in the PM peak hour during 4 i. fall-winter months). For northbound CSAII 83, sight distance is somewhat limited due to a sweeping north-to-west horizontal curve that begins approximately 300 feet north of the intersection. However, there are no impediments to sight distance in the median area and no trees or other topography exist to the north on either side of the roadway that limit sight distance for northbound left turning traffic at the intersection(northbound left turning traffic can see oncoming traffic clearly for at least the minimum stopping sight distance required at the posted 55 mph speed limit). Based on this information available stopping in sight distance meets this criteria for each intersection approach. I �y Based on the recent crash history at this intersection, no crashes were reported on the State of Minnesota's crash web site between 2011 and 2015. Thus, there does not appear to be a safety concern at this intersection with the presence of signalized operation, lr • One of the recommendations from the MnDOT Traffic Signal Timing and Coordination Manual is to utilize protected left turn phasing only either for p - situations where the p posted speed limit exceeds 45 mph and the peak hour left '{ p turning volume is greater than 240 vehicles per hour, or for when the cross product between left turning traffic volume and opposing through traffic volume exceeds 80,000. With regards to the most recent available traffic counts: a. Between the hours of 4:00 pm-5:00 pm of the most recent traffic counts, westbound Sunwood Drive left turn volumes were near 130 vehicles per hour. No other intersection approach exceeded 65 left turning vehicles per hour during the PM peak period. b. For the midday and AM peak, hour counts, no intersection approach had left F; turning traffic volumes that exceeded 70 vehicles per hour. E c. The cross product between left turn traffic volumes and opposing through V traffic volumes never exceeded 25,000 for any hour counted in 2016. F Following p g u against the flashing yellow arrow criteria from the MnDOT Traffic Signal Timing iT and Coordination Manual: is is 1. Left turn lanes line up well for each intersection approach with sufficient turning room in the intersection so that left turn paths were not conflicting. This was observed specifically for the westbound dual left turn lane/eastbound single left turn ; F I1 Ili f i F f l�. V II i i