CCP 02-26-2001 - Laserfiche WebLink

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. . . f{?/% For one or more queue lengths, the queue length exceeds the storage length, which results in significant upstream traffic impacts. The following guidelines were applied when conducting the traffic analysis and identifying the need to consider roadway improvements or mitigation measures. All intersections operating at a LOS E or F as a result of background traffic or Site-generated traffic would be considered for roadway improvement or mitigation measures. However, not all intersection movements expected to be at a LOS E or F require roadway improvements or mitigation measures. For example, if an individual movement operates at a LOS E or F but has a low volume, the movement would not be expected to significantly decrease the overall operation at the intersection. Similarly, not all queue lengths that exceed storage lengths necessitate roadway improvements or mitigation measures. For example, if a queue length exceeds the storage length but by only a short distance, the queue would not be expected to have a significant upstream impact. Or if the queue diminishes (clears out) regularly throughout the peak hour, the movement would not be expected to significantly disrupt upstream traffic. In addition, if an intersection or a specific movement at an intersection warrants consideration for mitigation due to the increased traffic volumes from a development, improvements would be applied only to return the intersection or specific movement back to the existing (background) traffic conditions. For example. if a particular intersection operates at a LOS E under existing conditions and LOS F with development volumes, mitigation measures would be considered to return the intersection to a LOS E condition. Mitigation measures to improve the intersection to an acceptable (LOS D) condition, which would be better than the existing conditions, would not be considered. Once a specific deficiency is identified that necessitates consideration for a roadway improvement or mitigation measure, the following solutions are evaluated to reduce or eliminate the deficiency: Optimizing the intersection signal timing, adjusting the intersection phasing, and/or reassigning the lane geometry; Implementing geometric improvements, including adding through lanes, adding turn lanes or lengthening turn lanes; Suggesting ways to reduce the number of vehicles that use that intersection or individual intersection movement. Such as directing vehicles to alternate routes or suggesting alternate modes of transportation. Walgreen's Traffic Impact Study Draft Repon Traffic Operations Methodology February 07, 2001 3-3