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Buffer-Based Area Type Determination for Travel Demand Modeling in Network Links

This paper discusses a buffer-based methodology for determining area types relevant to traditional highway link analysis in travel demand models. It emphasizes the limitations of existing methods that rely on manual classification and highlights the benefits of a GIS-based approach. By utilizing buffer analysis, the proposed method collects proportional socio-economic data from surrounding TAZs, enabling a more accurate, efficient, and adaptable area type determination. The approach minimizes biases and addresses issues such as inconsistency and labor intensity, ultimately enhancing travel demand model accuracy.

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Buffer-Based Area Type Determination for Travel Demand Modeling in 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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