Notes
HCM 2000 signalized intersection capacity analysis for three intersections along S 128th St under 2032 No Action PM Peak conditions, prepared by Concord Engineering, Inc. as part of the SAMP Surface Transportation Analysis. Intersections analyzed: (1) SR 509 SB Ramps & S 128th St — control delay 21.3s, LOS C, ICU 104.6% (LOS G), v/c ratio 0.58, cycle length 75.1s; (2) NB SR 509 Ramps & S 128th St — control delay 18.7s, LOS B, ICU 104.6% (LOS G), v/c ratio 0.59, cycle length 75.1s; (3) Des Moines Way S & S 128th St — control delay 26.5s, LOS C, ICU 63.3% (LOS B), v/c ratio 0.65, cycle length 63.4s. Documents include lane configurations, saturation flow rates, v/s ratios, actuated green times, RTOR reductions, progression factors, and incremental delay for eastbound, westbound, northbound, and southbound movements. SR509 corridor surface transportation intersection performance data for the Sustainable Airport Master Plan (SAMP) Draft EA.