Appendix D Traffic Impact Analysis - westplainseis.com

HCM Signalized Intersection Capacity Analysis
1: Hwy. 2 & Craig Road 2/8/2011
Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR
Lane Configurations
Volume (vph) 292 1821 292 90 1606 535 225 114 75 404 100 217
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 5.5 5.0 5.0 5.0 5.0 5.0
Lane Util. Factor 0.97 0.95 1.00 1.00 0.95 1.00 0.97 0.95 0.97 1.00 1.00
Frt 1.00 1.00 0.85 1.00 1.00 0.85 1.00 0.94 1.00 1.00 0.85
Flt Protected 0.95 1.00 1.00 0.95 1.00 1.00 0.95 1.00 0.95 1.00 1.00
Satd. Flow (prot) 3467 3574 1599 1787 3574 1599 3467 3361 3467 1881 1599
Flt Permitted 0.95 1.00 1.00 0.95 1.00 1.00 0.95 1.00 0.95 1.00 1.00
Satd. Flow (perm) 3467 3574 1599 1787 3574 1599 3467 3361 3467 1881 1599
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) 314 1958 314 97 1727 575 242 123 81 434 108 233
RTOR Reduction (vph) 0 0 59 0 0 236 0 72 0 0 0 85
Lane Group Flow (vph) 314 1958 255 97 1727 339 242 132 0 434 108 148
Heavy Vehicles (%) 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1%
Turn Type Prot Perm Prot Perm Prot Prot Perm
Protected Phases 5 2 1 6 3 8 7 4
Permitted Phases 2 6 4
Actuated Green, G (s) 10.5 78.5 78.5 6.5 74.5 74.5 11.8 15.0 14.0 17.2 17.2
Effective Green, g (s) 10.5 78.5 78.5 6.5 74.5 74.5 11.8 15.0 14.0 17.2 17.2
Actuated g/C Ratio 0.08 0.58 0.58 0.05 0.55 0.55 0.09 0.11 0.10 0.13 0.13
Clearance Time (s) 5.5 5.5 5.5 5.5 5.5 5.5 5.0 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 3.0 3.0
Lane Grp Cap (vph) 270 2078 930 86 1972 882 303 373 360 240 204
v/s Ratio Prot c0.09 c0.55 0.05 0.48 0.07 0.04 c0.13 0.06
v/s Ratio Perm 0.16 0.21 c0.09
v/c Ratio 1.16 0.94 0.27 1.13 0.88 0.38 0.80 0.35 1.21 0.45 0.73
Uniform Delay, d1 62.2 26.2 14.1 64.2 26.2 17.2 60.4 55.5 60.5 54.5 56.6
Progression Factor 1.07 0.80 0.62 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
Incremental Delay, d2 101.1 8.6 0.6 135.8 5.8 1.3 13.6 0.6 115.9 1.3 12.2
Delay (s) 167.8 29.5 9.2 200.0 32.1 18.5 74.1 56.1 176.4 55.9 68.8
Level of Service F C A F C B E E F E E
Approach Delay (s) 43.9 35.6 65.9 127.3
Approach LOS D D E F
Intersection Summary
HCM Average Control Delay 52.7 HCM Level of Service D
HCM Volume to Capacity ratio 0.96
Actuated Cycle Length (s) 135.0 Sum of lost time (s) 16.0
Intersection Capacity Utilization 89.9% ICU Level of Service E
Analysis Period (min) 15
Description: Dual EB, NB, SB lefts, 2nd NB through lane, Optimized
c Critical Lane Group
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