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Thread: What's the state of practice on travel demand modeling

  1. #1

    What's the state of practice on travel demand modeling

    What's the state of practice right now on TDM:
    • Trip Generation
    • Modeling with Trip rates(national/collected/average)
  2. Modeling with ITE manual
  • Pure math models
  • Trip Distribution
  • Which models are used for what?
  • Multimodal distribution
  • external trip estimation
  • logit based models
  • Mode Choice
  • Trip Assignment
  • Validation and Calibration
  • Future forecasting
  • etc
  • Quote Quote

  • #2
    Cyburbian DetroitPlanner's avatar
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    Uhh I don't understand you. TDM is not modeling though you can model the impact of TDM countermeasures.

    http://www.ops.fhwa.dot.gov/aboutus/...emand_mgmt.pdf
    We hope for better things; it will arise from the ashes - Fr Gabriel Richard 1805

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    Cyburbian
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    I think your question is FAR to broad to elicit any really useful responses. You can see for yourself from your google search that there are many, many tools out there, but that's just the tip of the iceberg as virtually all of them have extensive programming environments used to really customize things for each specific area. What you do depends a lot on the data you have, what sort of answers you need, the area, time-frame, types of traffic (e.g. transit and especially freight are often quite different) etc. You may also want to look at trip-chaining, activity based models, and mesoscopic modelling too.

    Also note that TDM in my experience at least refers to Travel Demand Management, not modelling, but that probably varies depending on your local vocabulary. there is definitely a name-space shortage for acronyms in our field!

    Can you be more specific with your interests perhaps?

  • #5
    Cyburbian DetroitPlanner's avatar
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    Quote Originally posted by Don View post
    Can you be more specific with your interests perhaps?
    Thats the point I was trying to make, you have just reiterated the basic four steps along with checks for validity. By calling it TDM does not mean much as transportation planning is full of a lot of acronyms some of which mean different things to different sub-sets of planners.
    We hope for better things; it will arise from the ashes - Fr Gabriel Richard 1805

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