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Appendix D Traffic Impact Analysis - westplainseis.com

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HCM Signalized Intersection Capacity <strong>Analysis</strong><br />

3: Hwy. 2 & Lawson St 1/24/2011<br />

Movement EBL EBT EBR WBL WBT WBR NBL NBT NBR SBL SBT SBR<br />

Lane Configurations<br />

Volume (vph) 39 1144 13 87 838 14 60 27 89 45 33 20<br />

Ideal Flow (vphpl) 1900 1900 1900 1900 1900 1900 1900 1900 1900 1900 1900 1900<br />

Total Lost time (s) 5.0 5.0 5.0 5.0 4.0 4.0 4.0 4.0<br />

Lane Util. Factor 1.00 0.95 1.00 0.95 1.00 1.00 1.00 1.00<br />

Frt 1.00 1.00 1.00 1.00 1.00 0.85 1.00 0.85<br />

Flt Protected 0.95 1.00 0.95 1.00 0.97 1.00 0.97 1.00<br />

Satd. Flow (prot) 1787 3568 1787 3565 1818 1599 1828 1599<br />

Flt Permitted 0.95 1.00 0.95 1.00 0.75 1.00 0.79 1.00<br />

Satd. Flow (perm) 1787 3568 1787 3565 1406 1599 1486 1599<br />

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<br />

Adj. Flow (vph) 42 1230 14 94 901 15 65 29 96 48 35 22<br />

RTOR Reduction (vph) 0 0 0 0 1 0 0 0 61 0 0 16<br />

Lane Group Flow (vph) 42 1244 0 94 915 0 0 94 35 0 83 6<br />

Heavy Vehicles (%) 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1%<br />

Turn Type Prot Prot Perm Perm Perm Perm<br />

Protected Phases 1 6 5 2 4 8<br />

Permitted Phases 4 4 8 8<br />

Actuated Green, G (s) 4.2 44.7 11.1 51.6 12.9 12.9 12.9 12.9<br />

Effective Green, g (s) 4.2 44.7 11.1 51.6 12.9 12.9 12.9 12.9<br />

Actuated g/C Ratio 0.05 0.54 0.13 0.62 0.16 0.16 0.16 0.16<br />

Clearance Time (s) 5.0 5.0 5.0 5.0 4.0 4.0 4.0 4.0<br />

Vehicle Extension (s) 3.0 3.8 3.0 2.5 3.0 3.0 3.0 3.0<br />

Lane Grp Cap (vph) 91 1929 240 2224 219 249 232 249<br />

v/s Ratio Prot 0.02 c0.35 0.05 c0.26<br />

v/s Ratio Perm c0.07 0.02 0.06 0.00<br />

v/c Ratio 0.46 0.64 0.39 0.41 0.43 0.14 0.36 0.02<br />

Uniform Delay, d1 38.2 13.4 32.7 7.9 31.6 30.1 31.2 29.6<br />

Progression Factor 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00<br />

Incremental Delay, d2 3.7 0.8 1.1 0.1 1.4 0.3 0.9 0.0<br />

Delay (s) 41.8 14.2 33.8 8.0 32.9 30.4 32.1 29.6<br />

Level of Service D B C A C C C C<br />

Approach Delay (s) 15.1 10.4 31.6 31.6<br />

Approach LOS B B C C<br />

Intersection Summary<br />

HCM Average Control Delay 15.1 HCM Level of Service B<br />

HCM Volume to Capacity ratio 0.54<br />

Actuated Cycle Length (s) 82.7 Sum of lost time (s) 9.0<br />

Intersection Capacity Utilization 59.9% ICU Level of Service B<br />

<strong>Analysis</strong> Period (min) 15<br />

c Critical Lane Group<br />

Existing PM Peak Hour Conditions<br />

Synchro 7 - Report<br />

cak Page 1

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