Appendix D Traffic Impact Analysis - westplainseis.com

HCM Signalized Intersection Capacity Analysis
14: Hwy. 2 & Middle Access 2/8/2011
Movement EBL EBT WBT WBR SBL SBR
Lane Configurations
Volume (vph) 366 1234 1114 539 804 174
Ideal Flow (vphpl) 1900 1900 1900 1900 1900 1900
Total Lost time (s) 5.0 5.0 4.0 4.0 4.0 4.0
Lane Util. Factor 1.00 0.95 0.95 1.00 0.97 1.00
Frt 1.00 1.00 1.00 0.85 1.00 0.85
Flt Protected 0.95 1.00 1.00 1.00 0.95 1.00
Satd. Flow (prot) 1770 3539 3539 1583 3433 1583
Flt Permitted 0.95 1.00 1.00 1.00 0.95 1.00
Satd. Flow (perm) 1770 3539 3539 1583 3433 1583
Peak-hour factor, PHF 0.92 0.92 0.92 0.92 0.92 0.92
Adj. Flow (vph) 398 1341 1211 586 874 189
RTOR Reduction (vph) 0 0 0 354 0 138
Lane Group Flow (vph) 398 1341 1211 232 874 51
Turn Type Prot Perm Perm
Protected Phases 5 2 6 4
Permitted Phases 6 4
Actuated Green, G (s) 28.4 80.0 47.6 47.6 31.0 31.0
Effective Green, g (s) 28.4 80.0 47.6 47.6 31.0 31.0
Actuated g/C Ratio 0.24 0.67 0.40 0.40 0.26 0.26
Clearance Time (s) 5.0 5.0 4.0 4.0 4.0 4.0
Vehicle Extension (s) 3.0 3.0 3.0 3.0 3.0 3.0
Lane Grp Cap (vph) 419 2359 1404 628 887 409
v/s Ratio Prot c0.22 0.38 c0.34 c0.25
v/s Ratio Perm 0.15 0.03
v/c Ratio 0.95 0.57 0.86 0.37 0.99 0.12
Uniform Delay, d1 45.1 10.7 33.2 25.6 44.3 34.1
Progression Factor 1.00 1.00 1.00 1.00 0.98 0.94
Incremental Delay, d2 31.0 1.0 7.2 1.7 26.9 0.6
Delay (s) 76.1 11.7 40.4 27.3 70.3 32.8
Level of Service E B D C E C
Approach Delay (s) 26.5 36.1 63.7
Approach LOS C D E
Intersection Summary
HCM Average Control Delay 38.8 HCM Level of Service D
HCM Volume to Capacity ratio 0.92
Actuated Cycle Length (s) 120.0 Sum of lost time (s) 13.0
Intersection Capacity Utilization 84.8% ICU Level of Service E
Analysis Period (min) 15
Description: Signalized, Optimized
c Critical Lane Group
2015 plus Project, Alt. 1, PH2-Mitigation Synchro 7 - Report
cak Page 5