Appendix D Traffic Impact Analysis - westplainseis.com

HCM Signalized Intersection Capacity Analysis
11: Hwy. 2 & Fairchild AFB 2/10/2011
Movement EBT EBR WBL WBT NBL NBR
Lane Configurations
Volume (vph) 778 60 621 843 439 1243
Ideal Flow (vphpl) 1900 1900 1900 1900 1900 1900
Total Lost time (s) 6.0 6.0 6.0 6.0 4.0 4.0
Lane Util. Factor 0.95 1.00 0.97 0.95 0.97 1.00
Frt 1.00 0.85 1.00 1.00 1.00 0.85
Flt Protected 1.00 1.00 0.95 1.00 0.95 1.00
Satd. Flow (prot) 3471 1553 3467 3574 3502 1615
Flt Permitted 1.00 1.00 0.95 1.00 0.95 1.00
Satd. Flow (perm) 3471 1553 3467 3574 3502 1615
Peak-hour factor, PHF 0.72 0.72 0.72 0.72 0.72 0.72
Adj. Flow (vph) 1081 83 862 1171 610 1726
RTOR Reduction (vph) 0 47 0 0 0 0
Lane Group Flow (vph) 1081 36 862 1171 610 1726
Heavy Vehicles (%) 4% 4% 1% 1% 0% 0%
Turn Type Perm Prot Free
Protected Phases 6 5 2 4
Permitted Phases 6 Free
Actuated Green, G (s) 31.9 31.9 24.9 62.8 21.4 94.2
Effective Green, g (s) 31.9 31.9 24.9 62.8 21.4 94.2
Actuated g/C Ratio 0.34 0.34 0.26 0.67 0.23 1.00
Clearance Time (s) 6.0 6.0 6.0 6.0 4.0
Vehicle Extension (s) 3.0 3.0 3.0 3.0 3.0
Lane Grp Cap (vph) 1175 526 916 2383 796 1615
v/s Ratio Prot 0.31 0.25 0.33 0.17
v/s Ratio Perm 0.02 c1.07
v/c Ratio 0.92 0.07 0.94 0.49 0.77 1.07
Uniform Delay, d1 29.9 21.1 33.9 7.8 34.1 47.1
Progression Factor 1.00 1.00 1.00 1.00 1.00 1.00
Incremental Delay, d2 11.6 0.1 17.2 0.2 4.4 43.3
Delay (s) 41.5 21.1 51.1 7.9 38.5 90.4
Level of Service D C D A D F
Approach Delay (s) 40.1 26.3 76.9
Approach LOS D C E
Intersection Summary
HCM Average Control Delay 50.5 HCM Level of Service D
HCM Volume to Capacity ratio 1.07
Actuated Cycle Length (s) 94.2 Sum of lost time (s) 0.0
Intersection Capacity Utilization 65.1% ICU Level of Service C
Analysis Period (min) 15
Description: Optimized
Add NB Left turn bay and WB through lane
c Critical Lane Group
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