Appendix D Traffic Impact Analysis - westplainseis.com

HCM Unsignalized Intersection Capacity Analysis
10: SR-902 & Craig 1/18/2011
Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR
Lane Configurations
Volume (veh/h) 50 284 9 14 284 22 5 47 5 43 80 168
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) 56 316 10 16 316 24 6 52 6 48 89 187
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 340 326 1009 803 321 817 796 328
vC1, stage 1 conf vol
vC2, stage 2 conf vol
vCu, unblocked vol 340 326 1009 803 321 817 796 328
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 % 95 99 95 83 99 80 71 74
cM capacity (veh/h) 1225 1245 120 299 720 244 303 716
Direction, Lane # EB 1 EB 2 WB 1 WB 2 NB 1 SB 1
Volume Total 56 326 16 340 63 323
Volume Left 56 0 16 0 6 48
Volume Right 0 10 0 24 6 187
cSH 1225 1700 1245 1700 277 431
Volume to Capacity 0.05 0.19 0.01 0.20 0.23 0.75
Queue Length 95th (ft) 4 0 1 0 22 154
Control Delay (s) 8.1 0.0 7.9 0.0 21.8 34.5
Lane LOS A A C D
Approach Delay (s) 1.2 0.3 21.8 34.5
Approach LOS C D
Intersection Summary
Average Delay 11.7
Intersection Capacity Utilization 53.2% ICU Level of Service A
Analysis Period (min) 15
Description: Add Southbound Right Turn Lane (100')
Existing PM Peak Hour Conditions
Synchro 7 - Report
cak Page 10