Item 5 - PH on Laurel Hill Plan - Laserfiche WebLink

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Larson Property Traffic Impact Study Page Plan specifies that unsignalized intersections must operate at level of service (LOS) "E" or better. For those movements that are found to exceed the mobility standards under the current plan designation, the proposed plan amendment will require mitigation if it further degrades the movement. The mitigation must bring the V/C back to the level of the current plan designation. d. Existing Level of Service For existing 2003 conditions, all intersections are stop controlled. The Highway Capacity Manual (HCM) defines the methods by which level-of-service (LOS) is calculated in this analysis. For unsignalizcd intersections, only the LOS on approaches where movements are required to STOP or yield are reported. The Highway Capacity Manual Soi~are (HCM2000 v.4.1 d) was used to evaluate the operation of all study intersections. The existing peak hour factors (PHF) from the traffic counts were used. The volume to capacity ratio (V/C), the level of service (LOS), and the 95t~ percentile queue lengths are reported. The rePorted queue length is in passenger cars, assuming 25 feet/car and rounded up in all cases. The right tums permitted without stopping were coded as flared right-turns from through lanes with a 2.0 second gap acceptance. The intersections were realigned in the model so that the STOPPED movements oppose each other and the gap acceptance values reassigned to the actual movement values. The results of the analyses are shoTM in Table 1 and the worksheets can be found in Appendix C. Table 1: 2003 Existing Peak ltour LOS Analysis AM Peak Hour PM Peak Hour Inters ction Movement ~ V/C LOS 95th% Queue WC LOS Queu Gl nwo d Blvd. @ I-5 NB Ramps Southbound Left turn 0.14 A 1 0.25 A 1 Westbound Movement 0.19 B 1 0.15 * C 1 Gl nw dDr. @l-SSBRamps Southbound Left turn 0.30 A 2 0.24 A 1 Westbound Movements 0.15 B 1 0.26 C 2 Glenwood Blvd. @ Glenwood Dr. Northbound Movements 0.38 C 2 0.26 C 2 Southbound Left turn 0.07 A I 0.11 A 1 Westbound Left tum 0.29 A 2 0.24 A 1 Moon Mountain Dr. @ Laurel Hill Dr. Northbound 0.14 A N/A 0.11 ^ N/A Southbound 0.24 A 0.21 A Eastbound 0.23 A 0.11 A Westbound 0.17 A 0.34 A Access Engineering December 1, 2003 ~..~B~31