Appendix D Traffic Impact Analysis - westplainseis.com

HCM Unsignalized Intersection Capacity Analysis
10: SR-902 & Craig 2/14/2011
Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR
Lane Configurations
Volume (veh/h) 78 346 11 17 346 78 6 101 6 112 149 222
Sign Control Free Free Stop Stop
Grade 0% 0% 0% 0%
Peak Hour Factor 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90
Hourly flow rate (vph) 87 384 12 19 384 87 7 112 7 124 166 247
Pedestrians
Lane Width (ft)
Walking Speed (ft/s)
Percent Blockage
Right turn flare (veh)
Median type None None
Median storage veh)
Upstream signal (ft)
pX, platoon unblocked
vC, conflicting volume 471 397 1316 1073 391 1086 1036 428
vC1, stage 1 conf vol
vC2, stage 2 conf vol
vCu, unblocked vol 471 397 1316 1073 391 1086 1036 428
tC, single (s) 4.1 4.1 7.1 6.5 6.2 7.1 6.5 6.2
tC, 2 stage (s)
tF (s) 2.2 2.2 3.5 4.0 3.3 3.5 4.0 3.3
p0 queue free % 92 98 75 44 99 0 21 61
cM capacity (veh/h) 1096 1173 27 200 658 100 211 629
Direction, Lane # EB 1 EB 2 WB 1 WB 2 NB 1 SB 1
Volume Total 87 397 19 471 126 537
Volume Left 87 0 19 0 7 124
Volume Right 0 12 0 87 7 247
cSH 1096 1700 1173 1700 153 222
Volume to Capacity 0.08 0.23 0.02 0.28 0.82 2.42
Queue Length 95th (ft) 6 0 1 0 134 1099
Control Delay (s) 8.6 0.0 8.1 0.0 89.3 687.9
Lane LOS A A F F
Approach Delay (s) 1.5 0.3 89.3 687.9
Approach LOS F F
Intersection Summary
Average Delay 233.1
Intersection Capacity Utilization 71.6% ICU Level of Service C
Analysis Period (min) 15
West Plains Development Traffic Impact Analysis 5:00 pm 2/8/2011 2032 Alternative 3 Buildout
Synchro 7 - Report
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