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Positive feedback : exploring current approaches in iterative travel demand model implementation.

File Language:
English


Details

  • Alternative Title:
    Project title: Positive feedback : an examination of current approaches in iterative travel demand model implementation
  • Creators:
    Reeder, Phillip ; Bhat, Chandra ORCID ICON IMG ; Lorenzini, Karen ; Hall, Kevin
  • Corporate Creators:
    Texas Transportation Institute
  • Corporate Contributors:
    Texas. Dept. of Transportation. Research and Technology Implementation Office ; United States. Federal Highway Administration
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA/TX-12/0-6632-1
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Texas
  • Edition:
    Technical report; Sept. 2010-Aug. 2011.
  • Corporate Publisher:
    Texas Transportation Institute
  • Abstract:
    Currently, the models that TxDOT’s Transportation Planning and Programming Division (TPP) developed are ; traditional three-step models (i.e., trip generation, trip distribution, and traffic assignment) that are sequentially ; applied. A limitation of this sequential approach is an inconsistency between the travel time data used in the different ; stages of the process that may result in: (1) TDMs, which do not accurately reflect system-wide or corridor-level travel ; patterns, (2) travel times in alternative analyses that may not reflect accurate results, and (3) inaccurate results being ; used for the air quality determination process. ; To resolve these differences in the model sequence, researchers proposed an iterative feedback mechanism as ; an approach. This project researched current trends, practices, and tools in implementing a feedback approach for ; potential implementation in the TxDOT TDMs. In general, past research and practice underscores the importance of ; incorporating feedback loops in the travel demand process, especially in regions with moderate to high levels of traffic ; congestion during certain times of the day. Since the current TxDOT TDM model does not include any impedance or ; accessibility measures in the trip generation step, the best current approach is to feed back the output from the traffic ; assignment step to the trip distribution step. Overall, critical consideration should be given to the relative impact that ; implementing feedback might have on existing TxDOT-TPP practices. A feedback mechanism necessarily includes ; additional training and increases the calibration time associated with delivering base year travel models; and possibly ; could include additional data processing (and collection) related to time-of-day implementation.
  • Format:
    PDF
  • Funding:
    Project Number 0-6632
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/23940/dot_23940_DS1.pdf
  • File Type:
    Filetype[PDF - 2.65 MB]
  • Collection(s):
    US Transportation Collection
  • Main Document Checksum:
    urn:sha-512:fd477098402d128818228609f5c8d7a40b952406484363989ce6f31fabb8074f4018811bf6356a8c7301313aaab673e1296cfe12b8aa9d06868999e973401966
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