07-17-2006 Planning Commission Packet

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� r Clarlc Lohr Pebruary 6,2006 Generally, Level of Service "D" represents the threshold for acceptable ovec�ll intersection operating COl1C�ItI011S CILIPing a peak hour. The acceptable threshold for a particular n�oveinent at an intersection depends on both the priority assigned to that movement and its traffic volume. In genecll, the higher the priority and the higher the traffic volume,the more stringent the acceptable threshold will be. i'or example,the acceptable threshold for a high-priority/high-volume movement might ve "C," while LOS "P" on a low-priority/low-volume movement might be appropriate. Typic111y,LOS "D" is chosen as the threshold for peak hour operations on facilities throughout the metropolitan acea. For side-street-stop-cont►•olled intersections, a key measure of operational effectiveness is the side street LOS. Long delays and poor LOS can sometimes result on the side street, even if the overall intersection is fi�nctioning well. Again, de�ending on priority and traffic volume, lcceptable side-street LOS can ringe from "D"to"F,"with LOS"D"typical ly chosen as the threshold. A final fundamental component of operational analyses is a study of vehicular queuing, or the lineup of vehicles waiting to pass througll an intersection. An intersection can operate witl� an acceptable level of service, but if queues from the intersection extend back to block e��trances to turn lanes or accesses to adjacent land uses, unsafe operating conditions could result. The 95'�' percentile c�ueue, or the length of queue with a 5% chance of occurring during the peak houc, is considered the standard for design purposes. Onerational Analysis Results 2009 No-Build Conditions Table 2 provides the results for 2009 No-Build conditions. It is noted tl�at existing signal timing inforination for the intersection of Wayzata Boulevard and Old Crystal Bay Road, provided by MnDOT, was utilized in determining an appropriate timing plan for the analysis. It was assumed that Hennepin County will undertake the process of conducting traffic counts and retiming signals along Wayzata Boulevard once new TH 12 has opened to traffic and jurisdiction of Wayzata Boulevard is turned over. Table 2. Results of O erational Analysis—2009 No-Build Intersection Melsure of Effectiveness AM Pe�k Hour PM Peak Hour Wayzata Overall LOS C C .__.._................_...._._....._._.....__......_._.._.._....__......._......_.._�-------- —•--- - Boulevard&Old _Worst Movement LOS D S2 movements ____ _ D(2 movements) Crystal B1y Rd. � �� Lon est 95'�Percentile ueueV �� 394 feet eastbound) 450 feet(westbound Wayzata Overall LOS A � A -�.................-�-�--._....---_..................__..---........._....__.......___._._-------- --.__.___._----__. -- Boulevard&Site Northbound LOS C C .�._..............._.......�...__�.._.......�_.........................._._.._._._.__.__�. __._. Access ._Nortlibound 95`"Percentile Queue, _ _____less tlian one vehicle _� _____�less tltan one vehicle 1Vlainline Dela %Vel�icle 0.0 sec%veli EB),0.1 sec%veh WB) 0.0 sec%veli CB&W.B) Old Ciystll Bay ... ... ... ....Ovei.all LOS........... ... A A ..--.--------__.....---.___..--.--.--.___.__.�..____._.._._.__._.._._...._----._.. _�._._. Rd.&South Site Eastbound/Westbound LOS C/13 B/B . .. . .... _._..__........._.... ... ---�--•-----�--.__._.___.__-------._.__._...______.._— -- Access Lon est 95'h Percentile Queue less than one vel�icle less than one vehicle Results of the o�erational analysis of 2009 No-Btiild conditions show acceptable overall intersection levels of service at all four studied intersections. On an II1dIVICIUI� movement basis, all movemenYs operated at LOS ".D" or better. Q«euing will reinain an issue o» Wayzata Boulevard during peak times, RLK Inc. Page 5 of7 Orono OPfice/Warehouse � G:1Rym�Companies12006-021-M1 Technieol Dnln\Imllic4c{wn102-10-OG upclnled sq fooinges\TIS menw 0?-I O.OG.doe 260G-02 I-M