Appendix D Traffic Impact Analysis - westplainseis.com

HCM Signalized Intersection Capacity Analysis
5: Hwy. 2 & Hayford Rd. 2/21/2011
Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR
Lane Configurations
Volume (vph) 439 1354 97 137 1328 194 96 191 173 344 128 314
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
Lane Util. Factor 0.97 0.95 1.00 0.95 1.00 1.00 0.95 0.97 0.95
Frt 1.00 0.99 1.00 1.00 0.85 1.00 0.93 1.00 0.89
Flt Protected 0.95 1.00 0.95 1.00 1.00 0.95 1.00 0.95 1.00
Satd. Flow (prot) 3467 3538 1787 3574 1599 1805 3353 3467 3193
Flt Permitted 0.95 1.00 0.95 1.00 1.00 0.95 1.00 0.95 1.00
Satd. Flow (perm) 3467 3538 1787 3574 1599 1805 3353 3467 3193
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) 467 1440 103 146 1413 206 102 203 184 366 136 334
RTOR Reduction (vph) 0 3 0 0 0 93 0 138 0 0 269 0
Lane Group Flow (vph) 467 1540 0 146 1413 113 102 249 0 366 201 0
Heavy Vehicles (%) 1% 1% 1% 1% 1% 1% 0% 0% 0% 1% 1% 1%
Turn Type Prot Prot pm+ov Prot Prot
Protected Phases 5 2 1 6 7 3 8 7 4
Permitted Phases 6
Actuated Green, G (s) 18.0 57.8 11.9 51.7 66.0 11.7 13.9 14.3 16.5
Effective Green, g (s) 18.0 57.8 11.9 51.7 66.0 11.7 13.9 14.3 16.5
Actuated g/C Ratio 0.15 0.48 0.10 0.43 0.55 0.10 0.12 0.12 0.14
Clearance Time (s) 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 2.1 3.0 3.0 3.0 3.0 3.0
Lane Grp Cap (vph) 520 1706 177 1541 880 176 389 413 439
v/s Ratio Prot 0.13 c0.44 0.08 c0.40 0.02 0.06 c0.07 c0.11 c0.06
v/s Ratio Perm 0.06
v/c Ratio 0.90 0.90 0.82 0.92 0.13 0.58 0.64 0.89 0.46
Uniform Delay, d1 50.0 28.5 53.0 32.1 13.0 51.7 50.6 52.0 47.6
Progression Factor 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
Incremental Delay, d2 18.0 7.1 25.7 8.8 0.1 4.6 3.6 19.8 0.8
Delay (s) 68.1 35.5 78.7 40.9 13.1 56.3 54.2 71.8 48.3
Level of Service E D E D B E D E D
Approach Delay (s) 43.1 40.8 54.6 58.6
Approach LOS D D D E
Intersection Summary
HCM Average Control Delay 45.9 HCM Level of Service D
HCM Volume to Capacity ratio 0.89
Actuated Cycle Length (s) 119.9 Sum of lost time (s) 22.0
Intersection Capacity Utilization 88.2% ICU Level of Service E
Analysis Period (min) 15
Description: Dual SB Left Turn Lanes, Optimized
c Critical Lane Group
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