Appendix D Traffic Impact Analysis - westplainseis.com

HCM Signalized Intersection Capacity Analysis
4: Hwy. 2 & Garfield St. 2/8/2011
Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR
Lane Configurations
Volume (vph) 123 2057 23 38 2134 219 52 24 97 177 19 100
Ideal Flow (vphpl) 1900 1900 1900 1900 1900 1900 1900 1900 1900 1900 1900 1900
Total Lost time (s) 5.5 5.5 5.5 5.5 5.5 5.0 5.0 5.0 5.0
Lane Util. Factor 1.00 0.95 1.00 0.95 1.00 1.00 1.00 1.00 1.00
Frt 1.00 1.00 1.00 1.00 0.85 1.00 0.88 1.00 0.87
Flt Protected 0.95 1.00 0.95 1.00 1.00 0.95 1.00 0.95 1.00
Satd. Flow (prot) 1787 3568 1787 3574 1599 1770 1639 1805 1660
Flt Permitted 0.95 1.00 0.95 1.00 1.00 0.61 1.00 0.60 1.00
Satd. Flow (perm) 1787 3568 1787 3574 1599 1130 1639 1144 1660
Peak-hour factor, PHF 0.93 0.93 0.93 0.93 0.93 0.93 0.93 0.93 0.93 0.93 0.93 0.93
Adj. Flow (vph) 132 2212 25 41 2295 235 56 26 104 190 20 108
RTOR Reduction (vph) 0 0 0 0 0 53 0 61 0 0 59 0
Lane Group Flow (vph) 132 2237 0 41 2295 182 56 69 0 190 69 0
Heavy Vehicles (%) 1% 1% 1% 1% 1% 1% 2% 2% 2% 0% 0% 0%
Turn Type Prot Prot Perm Perm Perm
Protected Phases 1 6 5 2 4 8
Permitted Phases 2 4 8
Actuated Green, G (s) 8.5 77.1 3.9 72.5 72.5 24.0 24.0 24.0 24.0
Effective Green, g (s) 8.5 77.1 3.9 72.5 72.5 24.0 24.0 24.0 24.0
Actuated g/C Ratio 0.07 0.64 0.03 0.60 0.60 0.20 0.20 0.20 0.20
Clearance Time (s) 5.5 5.5 5.5 5.5 5.5 5.0 5.0 5.0 5.0
Vehicle Extension (s) 3.0 3.0 3.0 3.1 3.1 3.0 3.0 3.0 3.0
Lane Grp Cap (vph) 126 2273 58 2141 958 224 325 227 329
v/s Ratio Prot c0.07 c0.63 0.02 c0.64 0.04 0.04
v/s Ratio Perm 0.11 0.05 c0.17
v/c Ratio 1.05 0.98 0.71 1.07 0.19 0.25 0.21 0.84 0.21
Uniform Delay, d1 56.2 21.4 58.0 24.2 11.0 40.9 40.6 46.6 40.6
Progression Factor 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
Incremental Delay, d2 93.5 15.2 32.4 42.0 0.1 0.6 0.3 22.6 0.3
Delay (s) 149.7 36.5 90.4 66.3 11.1 41.5 40.9 69.3 40.9
Level of Service F D F E B D D E D
Approach Delay (s) 42.8 61.6 41.1 57.8
Approach LOS D E D E
Intersection Summary
HCM Average Control Delay 52.5 HCM Level of Service D
HCM Volume to Capacity ratio 1.08
Actuated Cycle Length (s) 121.0 Sum of lost time (s) 21.5
Intersection Capacity Utilization 100.3% ICU Level of Service G
Analysis Period (min) 15
Description: Southbound left turn lane, Optimized
c Critical Lane Group
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