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- <br /> ASSl55P~EnT OF TM! TRAFFIC IMPACT ANALYSIS REPORT (TIp1i) <br /> IN COUNTY ENVIRONMlNTAL REPORT <br /> SUBMITT[D 6Y W. H. SHIPMAN LIMITED <br /> 70 HAWA>Q COUNTY ON SlPTlM!!R 27,1997 <br /> Dune on Apnl 15, :000 by P~nos D. Ptevedouros, PhD' db~ ATTR4 for James ~IcC.wly <br /> <br /> ~l REVIEW of TZAR <br /> I <br /> This section of the report deco-ibes Inspedlons on the accuracy of the methodology and <br /> calculations of the TIAR The next sectl~ralses questions on assumptions and breadth <br /> of analysis <br /> The Mp generation numbers :n the TIAR check OK, but pass-by (PB) trips were <br /> applied Incorrectly. Pass•bys are defined as trips that were already on the way, e.g., <br /> rrlotori;ts simply made a tern u, "II-„N y,:;, b,:r f:,cd, ctc (Thc more the PBs, the lesser <br /> the impact of the pro)ect on traffc.) The TZAR applies the PB factor to all trips. <br /> However, the PB factor applies StrlcGy to shopping center trips. In addition, [he <br /> estimate of PB=47Yo appears to be incorrect; my estimate ~s 42.2%. These resul*. in a <br /> P.M, peak load which Is lighter by about 100 vehicles. The results for P.M. peak <br /> changed very Iltt1e when the corrections were made, <br /> Traffic assignment flows show lower-than-expected volumes on the other <br /> Intersection (Keaau-Pahoa antl Volcano Road) but the subject Irtersectlon appears to <br /> have been goaded properly, Also the assignment o! project-generated (new) traffic Is <br /> proportional to anticipated background volumes which is appropriate <br /> I compared recent volume counts provided from Hawall County with the 2008 <br /> volumes in the TIAR. The results are mixed. Based on recent counts, 1n the A.M, period <br /> (year 2008) the TZAR should have 1,635 vehicles but It has 1,4E7 In the P M period <br /> (year 20081 the TZAR should have 426 vehicles but It has 517. fhe A.M traffic at this <br /> intersection's much heaver than [he P.M traffic, so currently daring the morning peak <br /> period the intersection is likely to operate a little worse than shown in the TIAR. <br /> The Table below shows that I was able to replicate the TIAR's results for 2008 <br /> without proielct, However, for 2008 with project, my analyses produced results <br /> which are consistently one level of service worse than those In the TIAR. It ~s notable <br /> that delays on cntical movements are pro)ected to be particularly bad in the A.M. peak <br /> hour (with project). <br /> ' Aec Pr~rennr of Tnniporonm kalMeerfllf ~ Onewe Pmpem Knee, wept or l.n a PJK.~eenn{ 1,11 n Meow <br /> 1 <br /> <br />