Appendix D Traffic Impact Analysis - westplainseis.com

HCM Signalized Intersection Capacity Analysis
4: Hwy. 2 & Garfield St. 2/14/2011
Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR
Lane Configurations
Volume (vph) 141 2097 17 46 2168 266 52 29 118 215 23 110
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
Lane Util. Factor 1.00 0.95 1.00 0.95 1.00 1.00 1.00 1.00
Frt 1.00 1.00 1.00 1.00 0.85 0.92 1.00 0.85
Flt Protected 0.95 1.00 0.95 1.00 1.00 0.99 0.96 1.00
Satd. Flow (prot) 1787 3570 1787 3574 1599 1691 1818 1615
Flt Permitted 0.95 1.00 0.95 1.00 1.00 0.69 0.51 1.00
Satd. Flow (perm) 1787 3570 1787 3574 1599 1188 978 1615
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) 152 2255 18 49 2331 286 56 31 127 231 25 118
RTOR Reduction (vph) 0 0 0 0 0 72 0 40 0 0 0 55
Lane Group Flow (vph) 152 2273 0 49 2331 214 0 174 0 0 256 63
Heavy Vehicles (%) 1% 1% 1% 1% 1% 1% 2% 2% 2% 0% 0% 0%
Turn Type Prot Prot Perm Perm Perm Perm
Protected Phases 1 6 5 2 4 8
Permitted Phases 2 4 8 8
Actuated Green, G (s) 9.5 76.9 3.9 71.3 71.3 36.2 36.2 36.2
Effective Green, g (s) 9.5 76.9 3.9 71.3 71.3 36.2 36.2 36.2
Actuated g/C Ratio 0.07 0.58 0.03 0.54 0.54 0.27 0.27 0.27
Clearance Time (s) 5.5 5.5 5.5 5.5 5.5 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
Lane Grp Cap (vph) 128 2064 52 1916 857 323 266 440
v/s Ratio Prot c0.09 c0.64 0.03 c0.65
v/s Ratio Perm 0.13 0.15 c0.26 0.04
v/c Ratio 1.19 1.10 0.94 1.22 0.25 0.54 0.96 0.14
Uniform Delay, d1 61.8 28.0 64.4 30.9 16.5 41.3 47.7 36.7
Progression Factor 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
Incremental Delay, d2 138.6 53.5 102.9 102.5 0.2 1.7 44.6 0.2
Delay (s) 200.3 81.6 167.4 133.3 16.7 43.0 92.3 36.8
Level of Service F F F F B D F D
Approach Delay (s) 89.0 121.4 43.0 74.8
Approach LOS F F D E
Intersection Summary
HCM Average Control Delay 101.6 HCM Level of Service F
HCM Volume to Capacity ratio 1.19
Actuated Cycle Length (s) 133.0 Sum of lost time (s) 21.5
Intersection Capacity Utilization 110.0% ICU Level of Service H
Analysis Period (min) 15
Description: Optimized
c Critical Lane Group
West Plains Development Traffic Impact Analysis 5:00 pm 2/8/2011 2032 Alternative 3 Buildout
Synchro 7 - Report
Page 4