Your proposed model form for Gen3 model



RFI checklist for vendors: Proposal for the TPB Gen3 modelEach vendor responding to the RFI is asked to submit two items: 1) A concise report that explains and justifies the vendor’s proposed approach for the TPB’s Gen3 travel demand forecasting model; 2) a completed checklist (this document). More details about these two items can be found in Section 7 (“Deliverables”) of the product requirements document (PRD). In general, the checklist will provide a short summary of the proposed plan and the report will allow the vendor the opportunity to further describe and support the responses in the checklist.All items in this checklist refer to your proposal for the TPB Gen3 model, unless noted otherwise. For any items marked “please specify,” it is assumed that you will specify briefly on this checklist and will provide more detail in your written report.Your proposed model form for Gen3 model? Trip-based? Tour-based? Activity-based? Hybrid (please specify):Examples where your proposed model form has been implemented (list as many as you like in your report)LocationYear DevelopedWho Developed/Implemented Model?Are you recommending new data collection as part of the Gen3 or Gen4 model development work?? No? Yes, to support Gen3 model (data collection must occur early in the contract)? Yes, to support Gen4 model (data collection can occur in parallel with Gen3 model development)If yes, please describe briefly here and in more detail in your report:Role of big data in Gen3 model development? Big data to have a major role in Gen3 model development? Big data to have modest or no role in Gen3 model developmentPlease provide details in your report.Recommended model update progression: Gen3, Gen4., and long termReferring to Table 6 in the PRD (Section 5.1): Given that the COG/TPB model is currently in Quadrant 1 (aggregate travel demand model and aggregate travel supply/trip assignment model) and that the ultimate, long-term goal is to be in Quadrant 4 (disaggregate travel demand model and disaggregate travel supply/trip assignment model):Over the long term, what path should be taken to get from Quadrant 1 to Quadrant 4?? Q1 > Q3 > Q4 (move to disaggregate demand first)? Q1 > Q2 > Q4 (move to DTA first)? Q1 > Q4 (move to disaggregate demand & DTA at the same time)Given the planned three-year duration of the Gen3 model update, where do you proposed that the COG/TPB model should be at the end of the three-year contract?? Quadrant 1? Quadrant 2? Quadrant 3? Quadrant 4Over the long term, how long should it take to move from Quadrant 1 to Quadrant 4?? 1-2 years? 3-4 years? 5-6 years? 7+ yearsPlease provide details and justification in your report.Recommended zone/area system (check all boxes that apply)StepTAZMicro-analysis zones (MAZ)ParcelsOther (please specify)Land activity inputsNon-motorized travelHighway assignmentTransit assignmentFor the Gen3 or Gen4 model, should we be revising our current TAZ/area system and/or transportation network before making major model updates?? No? Yes, TAZ/area system? Yes, transp. network? Yes, bothIf yes to TAZ system, should it be updated to nest with Census geography?? No? YesShould Gen3 model include updates to TAZ/area system or networks to deal with non-motorized travel?? No? Yes, refine TAZ syst.? Yes, refine networks? Yes, refine bothModel inputs in your recommended Gen3 modelLand activity forecasts (covered above)Highway network? Single-resolution (current COG/TPB practice)? Multi-resolution (please specify):Transit network? Single-resolution (current COG/TPB practice)? Multi-resolution (please specify):What is your recommended approach for land use forecasting?? Delphi approach (current COG/TPB practice)? Land use model (please specify):? Other (please specify):Travel modes in your recommended modelCheck all boxes in the right-hand column that apply. See Section 6.1.3 in the PRD.Travel ModesCheck BoxesPerson travelMotor vehiclePrivate transp. (auto)Single-occupant vehiclesHigh-occupant vehiclesPublic transp.Fixed route, fixed sched.RailHeavy rail, such as MetrorailCommuter rail, such as MARC & VRELight rail transit (LRT)StreetcarNon-railLocal busCommuter/Express BusBus Rapid Transit (BRT)Shuttle bus *FerryFlexible route, flexible sched.Low-capacity motor vehiclesTaxi/taxicab/taxi **Ride hailing/transportation network companies (TNCs) *Short-term car rental/car sharing *Paratransit, such as MetroAccess *Demand responsive transit (DRT)Such as BRIDJ *Non-motorizedWalk **Bike **Private use, privately owned **Public use, bikeshare *Docking *Such as Capital BikeshareDockless *Such as LimeBike, Mobike, SpinFreightMed. truckHeavy truckOther commercial vehicles* Not included in current COG/TPB travel demand model** Included in current COG/TPB travel demand model, but in only a limited fashionTreatment of non-motorized (walk and bike) modes in Gen3 modelHow far should non-motorized travel be estimated in proposed model?? Trip generation (or equiv.)? Trip distribution (or equiv.)? Mode choice (or equiv).? Trip assignmentIf yes to “Trip assignment” above, which types of non-motorized trips should be assigned to network?? Only bike trips? Only walk trips? Both walk and bike tripsTreatment of transportation network companies (TNCs) in Gen3 modelPlease discuss in your report.Treatment of connected and autonomous vehicles (CAVs) in Gen3 modelPlease discuss in your report.Treatment of exogenous travel markets, including external travelPlease discuss in your report.Treatment of external-to-internal (EI)/internal-to-external (IE) transit tripsExamples include EI/IE transit trips at commercial airports and transit trips arriving at Union Station, which started outside the modeled area (e.g., Baltimore).? Do not model EI/IE transit travel (current practice)? Begin to model EI/IE transit travelTreatment of travel to three commercial airports? Treatment in current model is sufficient? Improve treatment of auto-related trips? Improve treatment of transit trips? Use special generator? Develop/use airport choice modelRecommendations for transit faresPlease discuss in your report.Recommendations for trip distribution? No changes? Develop destination choice model? Develop ABM? Other (please specify):Recommendations for mode choice (MC) in Gen3 modelTrade-off between MC and path building? Complex MC model; simple path-builder (dominant U.S. approach)? Simple MC model; complex path-builder (more common in Europe)Estimation and calibration techniques? Disaggregate, statistical estimation, followed by aggregate calibration (shrinking in popularity)? Asserted values for coefficients and nesting constants, followed by aggregate calibration (growing in popularity)Recommendations for traffic assignment in Gen3 model? Static ? Dynamic (DTA)In your report, please provide recommended static/DTA algorithm (e.g., Frank-Wolfe) and rationale.Treatment of managed-lane travel (HOV, HOT, toll) in Gen3 modelPlease discuss in your report.Recommendations for transit assignment in Gen3 modelFormat? Production-attraction (current COG/TPB practice & most common practice in the U.S.)? Origin-destinationApproach? All or nothing (current COG/TPB practice & most common practice in the U.S.)? Capacity-constrainedYour thoughts on our desired model run time threshold of 24 hours? Threshold is reasonable? Threshold is too short? Threshold is too longRecommended software/programing languages for new model? Cube (Citilabs)? EMME (INRO)? TransCAD (Caliper)? VISUM (PTV)? R? Python? Java? C++? Other (please specify):Rationale: Please specify in your report, though recognize that some of these decisions might best be left for the RFP.Do you recommend using a version control system to maintain model code?? No? Yes (please specify):? No opinionDo you recommend using bug-tracking software to maintain model code?? No? Yes (please specify):? No opinionRecommendation regarding software to manage transportation networks used by modelPlease discuss in your report.Minimum computer specifications (e.g., processors, memory, storage)Please specify in your report, though recognize that some of these decisions might best be left for the RFP. Also, if you have any suggestions about using cloud computing, please include your thoughts on this in your report. ................
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