Appendix D Traffic Impact Analysis - westplainseis.com

HCM Signalized Intersection Capacity Analysis
10: SR-902 & Craig 2/8/2011
Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR
Lane Configurations
Volume (vph) 83 284 9 14 284 130 5 140 5 155 176 200
Ideal Flow (vphpl) 1900 1900 1900 1900 1900 1900 1900 1000 1900 1900 1900 1900
Total Lost time (s) 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0
Lane Util. Factor 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
Frt 1.00 1.00 1.00 0.95 1.00 0.99 1.00 0.92
Flt Protected 0.95 1.00 0.95 1.00 0.95 1.00 0.95 1.00
Satd. Flow (prot) 1787 1873 1805 1811 1770 975 1787 1731
Flt Permitted 0.22 1.00 0.51 1.00 0.35 1.00 0.57 1.00
Satd. Flow (perm) 423 1873 973 1811 649 975 1081 1731
Peak-hour factor, PHF 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90
Adj. Flow (vph) 92 316 10 16 316 144 6 156 6 172 196 222
RTOR Reduction (vph) 0 2 0 0 26 0 0 2 0 0 67 0
Lane Group Flow (vph) 92 324 0 16 434 0 6 160 0 172 351 0
Heavy Vehicles (%) 1% 1% 1% 0% 0% 0% 2% 2% 2% 1% 1% 1%
Turn Type pm+pt pm+pt pm+pt pm+pt
Protected Phases 7 4 3 8 5 2 1 6
Permitted Phases 4 8 2 6
Actuated Green, G (s) 23.2 20.3 18.8 18.1 16.6 15.9 21.0 18.1
Effective Green, g (s) 23.2 20.3 18.8 18.1 16.6 15.9 21.0 18.1
Actuated g/C Ratio 0.42 0.36 0.34 0.32 0.30 0.28 0.38 0.32
Clearance Time (s) 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0
Vehicle Extension (s) 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0
Lane Grp Cap (vph) 247 681 338 587 207 278 444 561
v/s Ratio Prot c0.02 0.17 0.00 c0.24 0.00 0.16 c0.02 c0.20
v/s Ratio Perm 0.14 0.02 0.01 0.13
v/c Ratio 0.37 0.48 0.05 0.74 0.03 0.58 0.39 0.63
Uniform Delay, d1 11.3 13.7 12.4 16.8 14.1 17.1 12.4 16.0
Progression Factor 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
Incremental Delay, d2 0.9 0.5 0.1 4.9 0.1 2.9 0.6 2.2
Delay (s) 12.2 14.2 12.5 21.6 14.1 19.9 13.0 18.2
Level of Service B B B C B B B B
Approach Delay (s) 13.8 21.3 19.7 16.7
Approach LOS B C B B
Intersection Summary
HCM Average Control Delay 17.6 HCM Level of Service B
HCM Volume to Capacity ratio 0.75
Actuated Cycle Length (s) 55.8 Sum of lost time (s) 20.0
Intersection Capacity Utilization 65.6% ICU Level of Service C
Analysis Period (min) 15
Description: Signalized, Optimized
c Critical Lane Group
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