Travel Demand Model - OKI

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OKI/MVRPC Travel Demand Model – Version 6.05.6 Trip BalancingStep 16 applies the OKI trip attraction models to the entire consolidated region, and balancestotal attractions to productions. In the course of calibrating and validating the trip distributionand highway assignment models, it was determined that this method tended to overestimate thetrip interchanges between the OKI and MVRPC regions. The most likely reason is that the OKItrip attraction models do not fully apply to the MVRPC region. Original trip attraction models forMVRPC could not be estimated, due to lack of data. Instead, attraction scale factors wereintroduced to allow control over the allocation of attractions between the two regions. Thesescale factors were estimated jointly with the production scale factors by adjusting the modelregional volume and VMT estimates to the observed volume and VMT. Special attention was paidto the screenlines, in particular those at or near the border between the two regions. The finalattraction factors are shown in Table 5.8. Note that the overall effect of these factors is todecrease the attractiveness of the OKI region for work trips, and to decrease attractiveness ofthe MVRPC region for HBO trips.Table 5-8 HBW and HBO Attraction Scale FactorsRegionScale FactorHBW HBOOKI 0.85 0.90MVRPC 1.12 0.755.7 Step16 Batch, Control and Parameter FilesThe Step16 parameter file, ST1601.inp, was modified to add a new parameter to the tripgeneration program: the highest internal zone number (NIZ). Previously this parameter wasinternally calculated by assuming that all zones with no households and no employment wereexternal zones. This is no longer the case, and thus it was necessary to read this parameter oninput. ST1601.inp also specifies an additional output file (see Section 5.8). The Step16 batchfile, Step16.bat, was modified so that it now uses the new version of the executable program,ST160160.exe. The modified control and batch files are listed in Appendix A. Additional inputfiles to the Step16 program are listed in Table 5.9 below.Additional parameters were added to control the balancing of trip attractions to productions,identified in the control file as SCALHBW and SCALHBO. See Appendix B for a listing of thesefactors.Trip Generation - Trip Generation 20
OKI/MVRPC Travel Demand Model – Version 6.0Table 5-9 Step 16 Batch, Control and Parameter FilesFile Name Subdirectory Update Required DescriptionStep16.bat \Batch\Model60\ Yes Step 16 batch fileSt1601.inp \Batch\Model60\C Yes Step 16 parameter fileM0007 \Batch\Model60\C Yes Tranplan Taxi, EE, HBSC Trip TablesSchlpop.prn \Batch\Model60\C Yes School-age population by countyElem.prn \Batch\Model60\C No Elementary school enrollment databaseUniv.prn \Batch\Model60\C Yes University enrollment databaseMisc.prn \Batch\Model60\C No Miscellaneous trip purposes databaseRecr.prn \Batch\Model60\C Yes Recreational trip databaseHisch.prn \Batch\Model60\C Yes High school enrollment databaseShop.prn \Batch\Model60\C Yes Shopping trip databaseExtinfo.prn \Batch\Model60\C Yes External zones databaseZtoctos.prn \Batch\Model60\C Yes Zone-County-State equivalence table5.8 Executable Programs: ST160160The following modifications were made to the Step16 executable program:• Read parameter NIZ (highest internal zone number) from control file, instead of calculating itinternally.• Update parameter NZ (highest zone number) to 2531.• Modified calculation of school-age population so that it now includes the three MVRPCcounties (subroutine READ11).• Calculate the external-external trip ends directly from the EE trip table (M0007), thuseliminating the need for EETEND.EXE.• Ensure that internal zones that have no households and no employment produce zerointernal-external trips.• Write an additional output file, A1608, after "negative" trips have been set to zero."Negative" trips occur when total internal-internal trips in a zone are less than estimatedinternal-external trips, and this results partly due to random estimation errors in the internalexternaltrip regression models, as well as to random errors in the home-based tripproduction and attraction models. This occurs in approximately 10 zones throughout theconsolidated region. When the IE estimate for a given zone is larger than the home-basedestimate, the difference is set to zero, which has the effect of overestimating trips by anamount equal to the difference in the estimates. For the base year model estimates, thisoverestimation amounts to 32 trip productions and 307 trip attractions, which clearlyrepresents a negligible impact on total trip generation.• Apply the attraction scale factors prior to trip balancing.Trip Generation - Trip Generation 21
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APPENDIX F • TRAVEL DEMAND MODEL
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OKI/MVRPCTravel Demand ModelVersion
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Table of ContentsPart IPart IIPart
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OKI/MVRPC Travel Demand Model - Ver
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Table A.1 (cont.)Zone System Equiva
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Table A.2Zone System Equivalences -
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Table A.3Zone System Equivalences -
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Table B.1External Stations in the C
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Table B.1External Stations in the C
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Page 107 and 108: distance for each centroid or node.
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Page 117 and 118: Appendix ASample EMME/2 Transit Lin
Page 119 and 120: Appendix FTravel Demand ModelingTec
Page 121 and 122: Index of TablesTable 2-1 Socio-Econ
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Table of Contents1. Background ....
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Index of FiguresFigure 2-1 Alternat
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NORTH-SOUTH TRANSPORTATION INITIATI
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Run # 63: Start with 7.17 estimatio
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Run # 67:Split parking cost from ot
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Run # 70a:Include zero-auto segment
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Run # 71c:Repeat #71a with zero aut
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Run # 71g:Repeat #71d with wait tim
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Run # 73:Include residential densit
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Run # 76:Nest: auto vs transitVaria
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Run # 79:Repeat #72 with zero autos
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Run # 80:Nest: auto vs. all othersV
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Run # 82:(071h) nested: auto vs tra
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Run #3VariableModeDrive Shared Ride
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Run #8VariableModeDrive Shared Ride
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Run #12 test: make aoc=10.5 instead
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Run #29VariableModeDrive Shared Rid
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Run #33VariableModeDrive Shared Rid
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Run #37vot constrained to $7.00Vari
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Run #30bSame as #30a, combine cost
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Run #140 (same as run #40)vot const
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Run #140b (same as run #40)vot cons
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Run #141avot constrained to $3.00 &
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Run #141cvot constrained to $3.00 &
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Run # 1:Base RunVariablesModesDA Sh
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Run # 5:Base Run with walk time set
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Run # 8:Base Run, split walkVariabl
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Run # 10: Nested structure (autos v
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Part VITRIP ASSIGNMENT ANDVALIDATIO
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Index of TablesTable 2-1 Average Ve
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VOBFigure 4-8 Screenline Location -
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Table of Contents1. Introduction...
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Appendix FTravel Demand ModelingTec
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Table of Contents1. Introduction...
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2. Surveys and Other Datasets2.1 OK
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Table 2-1 OKI Home Interview Survey
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Table 1-4 On-Board Survey Data Dict
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2.3 External Station Survey - Conso
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2.4 External Cordon Survey - Consol
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2.5 External-External Trip Table fr
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2.20 Screenline Shape File - Screen
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