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Buffer-based Area Type Determination for Travel Demand Model Network Links

Buffer-based Area Type Determination for Travel Demand Model Network Links. Lee Klieman, P.E., PTOE. Traditional Highway Link Area Type. Use Combined with functional classification Capacity Free-flow speed Determination Surroundin g TAZs Manual.

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Buffer-based Area Type Determination for Travel Demand Model Network Links

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  1. Buffer-based Area Type Determination for Travel Demand Model Network Links Lee Klieman, P.E., PTOE

  2. Traditional Highway Link Area Type • Use • Combined with functional classification • Capacity • Free-flow speed • Determination • Surrounding TAZs • Manual

  3. Traditional Highway Link Area Type Determination • Problem • Link borders TAZs with differing area types • Traditional Solutions • Hierarchy of TAZ area types • Direct spatial tagging • Manual

  4. Traditional Solution limitations • Simplistic • Incorrect • Discontinuities • Labor-intensive

  5. Area Type Determination with Buffer Analysis • GIS-based • Buffer collects proportional S-E data from TAZ • Area type algorithm applied to area within buffer only • Avoids bias from large TAZ • Sensitive to changes in land use • No discontinuities • Buffer size adjustable to meet needs

  6. Area Type Determination with Buffer Analysis

  7. Area Type Determination with Buffer Analysis

  8. Future Refinements • Apply to census blocks within buffer • Adjust buffer width according TAZ area type • Smaller width for urban area • Larger width for rural area • User-specified “minimum” area type

  9. Thank you Questions or Comments?

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