Appendix D Traffic Impact Analysis - westplainseis.com

HCM Signalized Intersection Capacity Analysis
1: Hwy. 2 & Craig Road 1/25/2011
Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR
Lane Configurations
Volume (vph) 285 1286 87 90 1103 360 36 2 75 257 2 210
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 1.00 0.95 1.00 1.00 1.00 1.00
Frt 1.00 1.00 0.85 1.00 0.96 1.00 0.85 1.00 0.85
Flt Protected 0.95 1.00 1.00 0.95 1.00 0.95 1.00 0.95 1.00
Satd. Flow (prot) 1787 3574 1599 1787 3442 1787 1606 1787 1601
Flt Permitted 0.95 1.00 1.00 0.95 1.00 1.00 1.00 1.00 1.00
Satd. Flow (perm) 1787 3574 1599 1787 3442 1881 1606 1881 1601
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) 306 1383 94 97 1186 387 39 2 81 276 2 226
RTOR Reduction (vph) 0 0 12 0 19 0 0 75 0 0 202 0
Lane Group Flow (vph) 306 1383 82 97 1554 0 39 8 0 276 26 0
Heavy Vehicles (%) 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1%
Turn Type Prot Perm Prot pm+pt pm+pt
Protected Phases 5 2 1 6 3 8 7 4
Permitted Phases 2 8 4
Actuated Green, G (s) 22.5 82.1 82.1 10.3 69.9 10.6 10.6 14.4 14.4
Effective Green, g (s) 22.5 82.1 82.1 10.3 69.9 10.6 10.6 14.4 14.4
Actuated g/C Ratio 0.17 0.61 0.61 0.08 0.52 0.08 0.08 0.11 0.11
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 3.0 3.0 3.0 3.0 3.0 3.0
Lane Grp Cap (vph) 298 2174 972 136 1782 148 126 201 171
v/s Ratio Prot c0.17 0.39 0.05 c0.45 0.01 0.01 0.11 0.02
v/s Ratio Perm 0.05 c0.01 c0.04
v/c Ratio 1.03 0.64 0.08 0.71 0.87 0.26 0.07 1.37 0.15
Uniform Delay, d1 56.2 16.9 10.9 60.9 28.6 58.2 57.6 60.6 54.8
Progression Factor 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
Incremental Delay, d2 59.2 1.4 0.2 16.2 6.2 1.0 0.2 196.1 0.4
Delay (s) 115.5 18.3 11.1 77.1 34.8 59.1 57.8 256.7 55.2
Level of Service F B B E C E E F E
Approach Delay (s) 34.6 37.3 58.3 165.5
Approach LOS C D E F
Intersection Summary
HCM Average Control Delay 52.6 HCM Level of Service D
HCM Volume to Capacity ratio 0.92
Actuated Cycle Length (s) 135.0 Sum of lost time (s) 21.0
Intersection Capacity Utilization 94.3% ICU Level of Service F
Analysis Period (min) 15
Description: Signalized, NB/SB Left turn lanes, Optimized
c Critical Lane Group
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