Appendix D Traffic Impact Analysis - westplainseis.com

HCM Unsignalized Intersection Capacity Analysis
1: Hwy. 2 & Craig Road 2/8/2011
Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR
Lane Configurations
Volume (veh/h) 292 1821 292 90 1606 535 225 114 75 404 100 217
Sign Control Free Free Stop Stop
Grade 0% 0% 0% 0%
Peak Hour Factor 0.93 0.93 0.93 0.93 0.93 0.93 0.93 0.93 0.93 0.93 0.93 0.93
Hourly flow rate (vph) 314 1958 314 97 1727 575 242 123 81 434 108 233
Pedestrians
Lane Width (ft)
Walking Speed (ft/s)
Percent Blockage
Right turn flare (veh)
Median type TWLTL TWLTL
Median storage veh) 2 2
Upstream signal (ft)
pX, platoon unblocked
vC, conflicting volume 2302 2272 3930 5082 979 3669 4820 863
vC1, stage 1 conf vol 2586 2586 1920 1920
vC2, stage 2 conf vol 1344 2496 1749 2900
vCu, unblocked vol 2302 2272 3930 5082 979 3669 4820 863
tC, single (s) 4.1 4.1 7.5 6.5 6.9 7.5 6.5 6.9
tC, 2 stage (s) 6.5 5.5 6.5 5.5
tF (s) 2.2 2.2 3.5 4.0 3.3 3.5 4.0 3.3
p0 queue free % 0 57 0 0 68 0 0 22
cM capacity (veh/h) 218 224 0 0 251 0 0 300
Direction, Lane # EB 1 EB 2 EB 3 EB 4 WB 1 WB 2 WB 3 WB 4 NB 1 SB 1
Volume Total 314 979 979 314 97 863 863 575 445 775
Volume Left 314 0 0 0 97 0 0 0 242 434
Volume Right 0 0 0 314 0 0 0 575 81 233
cSH 218 1700 1700 1700 224 1700 1700 1700 0 0
Volume to Capacity 1.44 0.58 0.58 0.18 0.43 0.51 0.51 0.34 Err Err
Queue Length 95th (ft) 459 0 0 0 51 0 0 0 Err Err
Control Delay (s) 263.0 0.0 0.0 0.0 32.7 0.0 0.0 0.0 Err Err
Lane LOS F D F F
Approach Delay (s) 31.9 1.3 Err Err
Approach LOS F F
Intersection Summary
Average Delay
Err
Intersection Capacity Utilization 121.4% ICU Level of Service H
Analysis Period (min) 15
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