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CCP 02-26-2001
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CCP 02-26-2001
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<br />. <br /> <br />f I~ <br />~tl <br /> <br />. <br /> <br />3.0 Traffic Operations Analysis Methodology <br /> <br />A traffic operations analysis is a process that estimates the quality and capacity of traffic <br />flow along segments of roadway and through intersections. The traffic operations <br />analysis included; detennining level of service and queue lengths for each of the key <br />intersections. From these analyses, deficiencies in the roadway system were defined. <br />The next step was to develop, evaluate and present roadway improvements or mitigation <br />strategies for these deficiencies. The following sections detail the methodology and <br />standards followed in this Traffic Study. <br /> <br />3.1 Level of Service Summary <br /> <br />The approach to the traffic operations analysis is derived from the established <br />methodologies documented in the Highway Capacity Manual, Third Edition, 1997. The <br />Highway Capacity Manual (HCM) contains series of analysis techniques that are used to <br />evaluate the operation of transportation facilities under specified conditions. Sycnchro5 <br />and SimTraffic5, Highway Capacity Manual implementing operation analysis software <br />packages, were used to analyze the key intersections. <br /> <br />. <br /> <br />The results of an HCM analysis are typically presented in the form of a letter grade (A-F) <br />that provides a qualitative indication of the operational efficiency or effectiveness. The <br />letter grade assigned to HCM analysis results is referred to as Level of Service (LOS). <br />By definition, LOS A conditions represent high-quality operations (i.e., motorists . <br />experience very little delay or interference) and LOS F conditions represent very poor <br />operations (i.e., extreme delay or severe congestion). <br /> <br />In accordance the Minnesota Department of Transportation guidelines, this study uses the <br />LOS D / E boundary as the indicator of acceptable traffic operations. <br /> <br />3.2 Queue Summary <br /> <br />Using only a capacity analysis to determine impacts would neglect potential queuing <br />issues resulting from the background traffic or proposed development. A queue is <br />defined as a line of one or more vehicles waiting to be serviced by the system. For this <br />analysis, the system is represented by a signalized or unsignaIized intersection. A <br />queuing analysis was also conducted to determine if adequate storage length for left and <br />right turn lanes exists and will be available for future conditions. In addition, the queuing <br />analysis indicates issues with through-traffic spilling back into the upstream intersection. <br /> <br />. <br /> <br />The storage length for this Traffic Study is defined as the length of the turn lane (not <br />including the length ofthe taper into the turn lane) or the distance between intersections <br />(from the near side of the downstream intersection to the far side of the upstream <br />intersection). The queue lengths reported for the analysis were the 95th percentile queues <br />that are expected to occur during the peak hour. In some instances, the 95th percentile <br />queue length may exceed the storage length only once during the peak hour; however, the <br />queue length is still reported as exceeding the storage length. <br /> <br />Walgreen's Traffic Impact Study <br />Draft Report <br /> <br />Traffic Operations Methodology <br />February 07, 2001 <br /> <br />3-1 <br />
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