Appendix D Traffic Impact Analysis - westplainseis.com

HCM Signalized Intersection Capacity Analysis
5: Hwy. 2 & Hayford Rd. 2/10/2011
Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR
Lane Configurations
Volume (vph) 604 2079 176 179 2323 264 138 248 213 438 168 427
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 5.5
Lane Util. Factor 0.97 0.95 1.00 0.97 0.91 1.00 0.97 0.95 1.00 0.97 1.00 1.00
Frt 1.00 1.00 0.85 1.00 1.00 0.85 1.00 1.00 0.85 1.00 1.00 0.85
Flt Protected 0.95 1.00 1.00 0.95 1.00 1.00 0.95 1.00 1.00 0.95 1.00 1.00
Satd. Flow (prot) 3467 3574 1599 3467 5136 1599 3502 3610 1615 3467 1881 1599
Flt Permitted 0.95 1.00 1.00 0.95 1.00 1.00 0.95 1.00 1.00 0.95 1.00 1.00
Satd. Flow (perm) 3467 3574 1599 3467 5136 1599 3502 3610 1615 3467 1881 1599
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) 643 2212 187 190 2471 281 147 264 227 466 179 454
RTOR Reduction (vph) 0 0 30 0 0 79 0 0 1 0 0 9
Lane Group Flow (vph) 643 2212 157 190 2471 202 147 264 226 466 179 445
Heavy Vehicles (%) 1% 1% 1% 1% 1% 1% 0% 0% 0% 1% 1% 1%
Turn Type Prot pm+ov Prot pm+ov Prot pm+ov Prot pm+ov
Protected Phases 5 2 3 1 6 7 3 8 1 7 4 5
Permitted Phases 2 6 8 4
Actuated Green, G (s) 17.6 65.1 74.5 6.5 54.0 66.5 9.4 14.7 21.2 12.5 17.8 35.4
Effective Green, g (s) 17.6 65.1 74.5 6.5 54.0 66.5 9.4 14.7 21.2 12.5 17.8 35.4
Actuated g/C Ratio 0.15 0.54 0.62 0.05 0.45 0.55 0.08 0.12 0.18 0.10 0.15 0.29
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 5.5
Vehicle Extension (s) 3.0 2.5 3.0 3.0 2.1 3.0 3.0 3.0 3.0 3.0 3.0 3.0
Lane Grp Cap (vph) 505 1926 1059 187 2296 880 273 439 357 359 277 469
v/s Ratio Prot 0.19 c0.62 0.01 0.05 c0.48 0.02 0.04 0.07 0.03 c0.13 0.10 c0.14
v/s Ratio Perm 0.09 0.10 0.11 0.14
v/c Ratio 1.27 1.15 0.15 1.02 1.08 0.23 0.54 0.60 0.63 1.30 0.65 0.95
Uniform Delay, d1 51.6 27.9 9.8 57.1 33.4 14.0 53.6 50.3 46.2 54.1 48.5 41.8
Progression Factor 1.00 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 137.8 73.4 0.1 70.0 43.1 0.1 2.0 2.3 3.7 153.2 5.1 28.6
Delay (s) 189.4 101.3 9.8 127.2 76.5 14.1 55.7 52.6 49.8 207.4 53.6 70.4
Level of Service F F A F E B E D D F D E
Approach Delay (s) 114.3 73.8 52.3 125.8
Approach LOS F E D F
Intersection Summary
HCM Average Control Delay 95.4 HCM Level of Service F
HCM Volume to Capacity ratio 1.19
Actuated Cycle Length (s) 120.8 Sum of lost time (s) 22.0
Intersection Capacity Utilization 100.3% ICU Level of Service G
Analysis Period (min) 15
Description: Dual lefts all approaches, Reconfigure SB Through/Right
Add WB auxilliary lane
Add EB and NB right turn bays
Optimized
c Critical Lane Group
West Plains Development Traffic Impact Analysis
Synchro 7 - Report
2032-Alternative 1 Buildout-Mitigated Page 5