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) 78 284 9 14 284 113 5 126 5 137 161 196
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 0.96 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 1819 1770 974 1787 1726
Flt Permitted 0.25 1.00 0.49 1.00 0.40 1.00 0.58 1.00
Satd. Flow (perm) 474 1873 926 1819 743 974 1085 1726
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) 87 316 10 16 316 126 6 140 6 152 179 218
RTOR Reduction (vph) 0 2 0 0 23 0 0 3 0 0 72 0
Lane Group Flow (vph) 87 324 0 16 419 0 6 143 0 152 325 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) 20.2 18.2 17.4 16.8 15.8 15.2 20.4 17.5
Effective Green, g (s) 20.2 18.2 17.4 16.8 15.8 15.2 20.4 17.5
Actuated g/C Ratio 0.38 0.34 0.33 0.32 0.30 0.29 0.39 0.33
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) 231 644 315 578 234 280 457 571
v/s Ratio Prot c0.01 0.17 0.00 c0.23 0.00 0.15 c0.02 c0.19
v/s Ratio Perm 0.13 0.02 0.01 0.11
v/c Ratio 0.38 0.50 0.05 0.73 0.03 0.51 0.33 0.57
Uniform Delay, d1 11.5 13.8 12.1 16.0 13.2 15.7 11.0 14.6
Progression Factor 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
Incremental Delay, d2 1.0 0.6 0.1 4.5 0.0 1.6 0.4 1.3
Delay (s) 12.5 14.4 12.1 20.5 13.2 17.3 11.5 15.9
Level of Service B B B C B B B B
Approach Delay (s) 14.0 20.2 17.2 14.7
Approach LOS B C B B
Intersection Summary
HCM Average Control Delay 16.4 HCM Level of Service B
HCM Volume to Capacity ratio 0.65
Actuated Cycle Length (s) 52.9 Sum of lost time (s) 16.0
Intersection Capacity Utilization 63.3% ICU Level of Service B
Analysis Period (min) 15
Description: Signalized, Optimized
c Critical Lane Group
2015 plus Project, Alt. 1, PH2-Mitigation Synchro 7 - Report
cak Page 4