Appendix D Traffic Impact Analysis - westplainseis.com

HCM Signalized Intersection Capacity Analysis
5: Hwy. 2 & Hayford Rd. 2/22/2011
Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR
Lane Configurations
Volume (vph) 582 1853 154 179 2073 264 113 248 213 438 168 402
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 5.5 5.5 5.5 5.5 5.5
Lane Util. Factor 0.97 0.95 1.00 1.00 0.95 1.00 1.00 0.95 1.00 0.97 0.95
Frt 1.00 1.00 0.85 1.00 1.00 0.85 1.00 1.00 0.85 1.00 0.89
Flt Protected 0.95 1.00 1.00 0.95 1.00 1.00 0.95 1.00 1.00 0.95 1.00
Satd. Flow (prot) 3467 3574 1599 1787 3574 1599 1805 3610 1615 3467 3196
Flt Permitted 0.95 1.00 1.00 0.95 1.00 1.00 0.95 1.00 1.00 0.95 1.00
Satd. Flow (perm) 3467 3574 1599 1787 3574 1599 1805 3610 1615 3467 3196
Peak-hour factor, PHF 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94
Adj. Flow (vph) 619 1971 164 190 2205 281 120 264 227 466 179 428
RTOR Reduction (vph) 0 0 31 0 0 105 0 0 2 0 233 0
Lane Group Flow (vph) 619 1971 133 190 2205 176 120 264 225 466 374 0
Heavy Vehicles (%) 1% 1% 1% 1% 1% 1% 0% 0% 0% 1% 1% 1%
Turn Type Prot pm+ov Prot Perm Prot pm+ov Prot
Protected Phases 5 2 3 1 6 3 8 1 7 4
Permitted Phases 2 6 8
Actuated Green, G (s) 17.5 60.1 71.9 10.5 53.1 53.1 11.8 18.2 28.7 13.5 19.9
Effective Green, g (s) 17.5 60.1 71.9 10.5 53.1 53.1 11.8 18.2 28.7 13.5 19.9
Actuated g/C Ratio 0.14 0.48 0.58 0.08 0.43 0.43 0.09 0.15 0.23 0.11 0.16
Clearance Time (s) 5.5 5.5 5.5 5.5 5.5 5.5 5.5 5.5 5.5 5.5 5.5
Vehicle Extension (s) 3.0 2.5 3.0 3.0 2.1 2.1 3.0 3.0 3.0 3.0 3.0
Lane Grp Cap (vph) 488 1728 996 151 1527 683 171 529 444 377 512
v/s Ratio Prot 0.18 c0.55 0.01 0.11 c0.62 0.07 0.07 0.04 c0.13 c0.12
v/s Ratio Perm 0.07 0.11 0.10
v/c Ratio 1.27 1.14 0.13 1.26 1.44 0.26 0.70 0.50 0.51 1.24 0.88dr
Uniform Delay, d1 53.4 32.1 12.0 56.9 35.6 22.9 54.5 48.9 41.6 55.4 49.6
Progression Factor 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
Incremental Delay, d2 136.3 70.8 0.1 158.7 203.6 0.1 12.3 0.7 0.9 127.1 5.2
Delay (s) 189.7 102.9 12.0 215.6 239.2 23.0 66.8 49.6 42.6 182.5 54.8
Level of Service F F B F F C E D D F D
Approach Delay (s) 117.0 214.8 50.4 110.3
Approach LOS F F D F
Intersection Summary
HCM Average Control Delay 147.1 HCM Level of Service F
HCM Volume to Capacity ratio 1.15
Actuated Cycle Length (s) 124.3 Sum of lost time (s) 11.0
Intersection Capacity Utilization 116.1% ICU Level of Service H
Analysis Period (min) 15
Description: Dual SB Left Turn lane
dr Defacto Right Lane. Recode with 1 though lane as a right lane.
c Critical Lane Group
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