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1989_0213_packet
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1989_0213_packet
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11/23/2011 1:54:30 PM
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low is 1 6 <br />I & IP I <br />With a p.m. peak hour northbound left turn volume of 1,95 <br />a <br />vehicles ati a signalized south driveway, the key question to be <br />I <br />answered is: WHAT IS' THE MAXIMUM NUMBER OF VEHICLES THAT WILL BE <br />ENTERING THE SITE, IN' ONE PLATOON', AND WILL IT AFFECT TRAFFIC ON <br />FAIRVIEW AV'EVU-E'-:--L- <br />The existing signal, systems in, the area now operate on a 90- <br />slecond c,yicl,e, l,engthel Therefore,, a typical cycle of the signal <br />will release four northbound left-turning veh'icles: <br />('155 vehs/'(3600 slecs/90 sec cycle']) � 4 veh/cyc14 <br />]!Iowe,vier, assuming that left turns are made only with the <br />left, turn arrow,, the typi,cal platlooln will be 4 vehicles. For <br />municipal and county type roadways,, a factor of 1.5 times the <br />average flow rate, is, often assumed for dietermining the "design"- <br />platoon size for design purposes, <br />At this location, that would then be 4 vehicles times 1,5 <br />6 vehi,clies per cycle for <br />• standard maximum for design purposes, <br />To ensure that the entrance per,foirms adequately and well beyond <br />normally, accepted levels of design,,, we have made the following - <br />0 <br />further assiumptions. <br />(1) A factor olf 2 times the averaige flow rate has been use <br />rather than 1.5.i This would Produce a maxi'mum platoon of 8 <br />vehicle,si. i <br />(2) If' Ramsey Clounty were to increase the signal cycle <br />length from, 90 to 12,10 seconds, the combined effect <br />0 f all of <br />these,, possibilities would, mlean that the absolute m ' <br />I aximum platoon <br />producied by tihe signal system would be 10 vehicles, <br />Therefore, tihere will not be a queuing problem under normal <br />ci.rcumsitances with the three-way Itstop" control proposed for the <br />intersection. at thie end of the entrance. The storage of the <br />maximum, pla,tlooln will be an 'issue, only 'if the FIRST vehicle of t'.'te <br />Wi <br />
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