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<br />fl1-/?~ <br /> <br />. <br /> <br />A queue length from a left or right turn lane can exceed the storage length of the lane <br />because of background traffic or Site-generated traffic. Roadway improvements to <br />accommodate the background traffic or mitigation measures to handle Site-generated <br />traffic may not be necessary unless it is determined that the queue has a significant <br />impact on the operations at that intersection or the next upstream intersection. Examples <br />where the queue lengths would be considered a significant traffic operational deficiency <br />and roadway improvements or mitigation measures should be considered include: <br /> <br />I. A queue length at a particular intersection exceeds the storage length causing through <br />traffic to spill back through the next upstream intersection. <br /> <br />2. A queue length at a particular intersection exceeds the storage length and does not <br />clear out throughout the peak hour, with the result that traffic volumes for the entire <br />system begin to decrease. <br /> <br />Examples where the queue lengths would not be considered a significant traffic <br />operational deficiency, and roadway improvements or mitigation measures would not be <br />imperative include: <br /> <br />1. A queue length at a particular intersection exceeds the storage length by only a small <br />distance. <br /> <br />. 2. A queue length at a particular intersection exceeds the storage length but it does clear <br />out throughout the peak hour_ <br /> <br />3.3 Defining Impacts <br /> <br />As previously discussed, traffic impacts can be defined in a number of ways including: a) <br />by the level of service of the entire intersection, b) by the level of service of individual <br />movements within an intersection, and c) by the relationship between the queue length <br />and the storage length of an intersection movement. <br /> <br />Once a deficiency in an intersection, an intersection movement, or a queue length is <br />identified, the next step is to determine if the deficiency warrants a roadway improvement <br />(if caused by background traffic) or a mitigation measure (if caused by Site-generated <br />traffic). The following standards are applied: <br /> <br />For an intersection, the overall level of service of an intersection is expected to be <br />at a LOS E or F; <br /> <br />For one or more individual movements at an intersection, the level of service is <br />expected to be at a LOS E or F, which results in a significant decrease in the <br />overall operational efficiency at the intersection; or <br /> <br />. <br /> <br />Walgreen's Traffic Impact Study <br />Draft Report <br /> <br />Traffic Operations Methodology <br />February 07,2001 <br /> <br />3-2 <br />