Appendix D Traffic Impact Analysis - westplainseis.com

HCM Signalized Intersection Capacity Analysis
11: Hwy. 2 & Fairchild AFB 2/9/2011
Movement EBT EBR WBL WBT NBL NBR
Lane Configurations
Volume (vph) 451 49 314 547 361 744
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 1.00 1.00 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 1881 1805 1615
Flt Permitted 1.00 1.00 0.95 1.00 0.95 1.00
Satd. Flow (perm) 3471 1553 3467 1881 1805 1615
Peak-hour factor, PHF 0.72 0.72 0.72 0.72 0.72 0.72
Adj. Flow (vph) 626 68 436 760 501 1033
RTOR Reduction (vph) 0 51 0 0 0 0
Lane Group Flow (vph) 626 17 436 760 501 1033
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) 16.7 16.7 11.5 34.2 23.7 67.9
Effective Green, g (s) 16.7 16.7 11.5 34.2 23.7 67.9
Actuated g/C Ratio 0.25 0.25 0.17 0.50 0.35 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) 854 382 587 947 630 1615
v/s Ratio Prot 0.18 0.13 c0.40 c0.28
v/s Ratio Perm 0.01 0.64
v/c Ratio 0.73 0.04 0.74 0.80 0.80 0.64
Uniform Delay, d1 23.5 19.5 26.8 14.0 19.9 0.0
Progression Factor 1.00 1.00 1.00 1.00 1.00 1.00
Incremental Delay, d2 3.3 0.0 5.1 5.0 6.9 2.0
Delay (s) 26.8 19.6 31.9 19.0 26.8 2.0
Level of Service C B C B C A
Approach Delay (s) 26.1 23.7 10.1
Approach LOS C C B
Intersection Summary
HCM Average Control Delay 18.1 HCM Level of Service B
HCM Volume to Capacity ratio 0.80
Actuated Cycle Length (s) 67.9 Sum of lost time (s) 10.0
Intersection Capacity Utilization 57.1% ICU Level of Service B
Analysis Period (min) 15
c Critical Lane Group
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