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Travel Model Improvement Program Iowa Peer Exchange Travel Demand Model Calibration/Validation

Travel Model Improvement Program Iowa Peer Exchange Travel Demand Model Calibration/Validation. Presented by James B. Miller. Iowa Department of Transportation Ames, IA March 30 - April 1, 2004. Discussion Topics. Introduction Transportation planning projects

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Travel Model Improvement Program Iowa Peer Exchange Travel Demand Model Calibration/Validation

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  1. Travel Model Improvement Program Iowa Peer Exchange Travel Demand Model Calibration/Validation Presented by James B. Miller Iowa Department of Transportation Ames, IA March 30 - April 1, 2004

  2. Discussion Topics • Introduction • Transportation planning projects • Validation/Calibration steps • Remarks

  3. SIMPCO Transportation System Planning Model • Background • Results • Model Applications

  4. SIMPCO - Results • Steps • iterations • Key items • friction factors • time penalty - bridges • Screenline comparisons

  5. Friction factor adjustments

  6. Screenline Comparisons

  7. SIMPCO Model Applications • Forecasted traffic volumes for the downtown (Sioux City) segment along I-29

  8. Kane County, IL • Background • Results • Model Applications

  9. Kane County - Results • Steps • iterations • Key Items • friction factors • Mean travel time comparison • Screenline comparisons • within acceptable guidelines

  10. Mean Travel Times by Purpose

  11. Kane County Model Applications • Sub-area planning studies • Impact fee program • 2030 Long Range Transportation Plan • Fox River bridge crossing

  12. Lake County Transportation Improvement Program (LCTIP), IL • Background • Results • Model Applications

  13. LCTIP - Results • Steps • Iterations • Key items • Zone splitting - centroid connectors • Volume delay functions • Screenline comparisons

  14. LCTIP - Applications • Traffic Model used in the alternative development phase • Formed the basis of the County’s Long Range Transportation Plan

  15. Remarks • Use practical guidelines - references • Establish total travel demand, then adjust at the route/link level • Key items • “Good data” - traffic network and socioeconomic • Special Generators • Friction Factors • Volume Delay Functions • External trips • Model applications

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