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activity based method - summary of qa

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Summary of Webinar Q&A Question: How do you account for shoppers, doctor appointments, etc.? Guy Rousseau: Typically there is a home‐based shopping trip purpose Question: How well does the land use and TDM linkage work? Is there a validation process so that it can be shown that the underlying land use assumed for the TDM is appropriate? Guy Rousseau: Usually there would be a feedback loop from the land use model feeding back to the travel demand model, via composite impedances, such as congested travel times, in order to properly reflect congestion throughout land use and travel demand forecasts Question: Does the HH Size break out HH by age? (i.e. driving age?) Guy Rousseau: The traditional 4‐step model sometimes fail to account for age of the household members (though household size does break out by income groups typically), yet an activity‐based model with a population synthesizer allows to take into consideration age of the household members Question: How do you suggest modeling military bases where population and employment varies significantly from time to time? Guy Rousseau: A special generator, combined with seasonality effects, might do the trick here Question: Is there any guidance/publications out there to go from a daily travel demand model to a time of day model? Guy Rousseau: The diurnal distribution of traffic throughout the day would dictate the need to switch to a time of day model, say if you see the emergence of a mid‐day peak, then a time of day model may be warranted Question: How do you account for the diverted trips? Guy Rousseau: Diverted trips may be best accounted for within a traffic micro‐simulation model, or perhaps even a tour‐based model, traditional models are somewhat limited to properly reflect trip diversion Question: Is bike/ped part of this logit model? Guy Rousseau: Bike/ped trips are often set aside after trip generation, and not always assigned, unless you have a good bike/ped choice model with enough data to support it Question: So if you run a scenario with and without a bypass, then a traditional model is not the best way to estimate diversion from the existing facility to the bypass? Guy Rousseau: it depends upon how detailed your network coding is, but in the case of a bypass, the traditional model might suffice here in this case, depending upon its functional classification Question: How do you estimate the travel associated with the USGA annual championship tournament? Guy Rousseau: special events are not always well accounted for in a typical weekday/workday model, unless one has a special event model component Question: Say a trip is not directly from work to home, but instead work to shop then to home, how do you define these kinds of trips? Guy Rousseau: non‐home based, then home‐based other

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activity based method - Summary of QA

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  • SummaryofWebinarQ&AQuestion:Howdoyouaccountforshoppers,doctorappointments,etc.?GuyRousseau:Typicallythereisahomebasedshoppingtrippurpose

    Question:HowwelldoesthelanduseandTDMlinkagework?IsthereavalidationprocesssothatitcanbeshownthattheunderlyinglanduseassumedfortheTDMisappropriate?GuyRousseau:Usuallytherewouldbeafeedbackloopfromthelandusemodelfeedingbacktothetraveldemandmodel,viacompositeimpedances,suchascongestedtraveltimes,inordertoproperlyreflectcongestionthroughoutlanduseandtraveldemandforecasts

    Question:DoestheHHSizebreakoutHHbyage?(i.e.drivingage?)GuyRousseau:Thetraditional4stepmodelsometimesfailtoaccountforageofthehouseholdmembers(thoughhouseholdsizedoesbreakoutbyincomegroupstypically),yetanactivitybasedmodelwithapopulationsynthesizerallowstotakeintoconsiderationageofthehouseholdmembers

    Question:Howdoyousuggestmodelingmilitarybaseswherepopulationandemploymentvariessignificantlyfromtimetotime?GuyRousseau:Aspecialgenerator,combinedwithseasonalityeffects,mightdothetrickhere

    Question:Isthereanyguidance/publicationsouttheretogofromadailytraveldemandmodeltoatimeofdaymodel?GuyRousseau:Thediurnaldistributionoftrafficthroughoutthedaywoulddictatetheneedtoswitchtoatimeofdaymodel,sayifyouseetheemergenceofamiddaypeak,thenatimeofdaymodelmaybewarranted

    Question:Howdoyouaccountforthedivertedtrips?GuyRousseau:Divertedtripsmaybebestaccountedforwithinatrafficmicrosimulationmodel,orperhapsevenatourbasedmodel,traditionalmodelsaresomewhatlimitedtoproperlyreflecttripdiversion

    Question:Isbike/pedpartofthislogitmodel?GuyRousseau:Bike/pedtripsareoftensetasideaftertripgeneration,andnotalwaysassigned,unlessyouhaveagoodbike/pedchoicemodelwithenoughdatatosupportit

    Question:Soifyourunascenariowithandwithoutabypass,thenatraditionalmodelisnotthebestwaytoestimatediversionfromtheexistingfacilitytothebypass?GuyRousseau:itdependsuponhowdetailedyournetworkcodingis,butinthecaseofabypass,thetraditionalmodelmightsufficehereinthiscase,dependinguponitsfunctionalclassification

    Question:HowdoyouestimatethetravelassociatedwiththeUSGAannualchampionshiptournament?GuyRousseau:specialeventsarenotalwayswellaccountedforinatypicalweekday/workdaymodel,unlessonehasaspecialeventmodelcomponent

    Question:Sayatripisnotdirectlyfromworktohome,butinsteadworktoshopthentohome,howdoyoudefinethesekindsoftrips?GuyRousseau:nonhomebased,thenhomebasedother

  • Question:Doyoucalibratetheintersectionturningmovementvolumes?GuyRousseau:intersectionturningmovementsarenotnecessarilyalwayscalibratedwithinaregionaltraveldemandmodel,buttheyareasapartofatrafficmicrosimulationmodel

    Question:IstherealegitimatewaytocalculateVMTandVHTfromTAZtoTAZinamodelwith4000TAZs?GuyRousseau:zonetozonematricesandskimmatrices,combinedwithtraveltimesanddistancesfromzonetozonemayhelpheredeterminewhatyouneed

    Question:Howdoyoumodelcollegefootballgamesinthefall?GuyRousseau:hereagain,specialeventswouldneedtobepostprocessedinordertobefactoredin,rememberherewemodelthetypicalweekdayworkday

    Question:Iftheintersectionturningmovementvolumesarenotcalibrated,howdowegetthefutureintersectionturningmovementvolumesfromtheforecastingmodel?GuyRousseau:whilewemayobtainintersectingvolumesfromlinkscrossings,leftturnandrightturnandthroughmovementsarebestobtainedinamicrosimulationmodel

    Question:Isthereagoodwaytoaccountforsignalsinatraditionalmodel?GuyRousseau:viaturnpenaltiesandturnprohibitionsyoumayaccountfortrafficsignals

    Question:TranscadorTransplanwhichisbetter?GaryThomas:FHWAandtheTMIPprogramdonotendorseorcommentonthequalityofvarioussoftwarepackages.

    Question:Howarethedifferentattractioncriteriaweighted?Forexamplewhenweighingtransitwiththecriterialistedtheoverallcostwouldbelowerwhereastraveltimemaybehigher.Ultimatelyhowcouldyouusethecriteriatoplanfordifferentmodalbalancingutilizingexistingtraveldata?EricPihl:Generallythoserelationshipsareestablishedwhenmodelsareestimated.Generallychoicebasedmodelsenabletheinclusionofvariablesthatrelatetolandusecharacteristicsandotherimportantattributes,andthoseweightsarederivedusingmodelestimationsoftware(alogitandlimdeparecommonpackages)

    Question:Howcanamodelreplicateandevaluatecompletestreetpolicy?EricPihl:Somemodelsinthe90sweredevelopedwith'pedestrianenvironmentfactors'todescribebike/pedfriendlinessandconsideredinnetworkassignment.Otherapproachesmayincludeadjustingthespeedandcapacityinputstomodelsasaproxyfordesignimprovements.

    Question:Ifwewouldliketosimulatetheintersectionoperationin2030,weneedtogettheintersectionturningmovementfromtheforecastingmodel,butwejustdon'thavetheaccuratevolumesifnotcalibrated?EricPihl:Turningmovementsareoftendifficulttomatchwithouttheadoptionofturnpenaltiesintripassignment.ManyareasuseNCHRP255methodsthatsimplyfactorcountsbasedonmodelderivedgrowthrates.


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