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Travel Demand Model VLMPO CAC-TAC

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Presentation on the Valdosta-Lowndes Metropolitan Planning Organization's Travel Demand Model to the Citizen's Advisory Committee and the Technical Advisory Committee.

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Travel Demand Model VLMPO CAC-TAC

  1. 1. Valdosta-Lowndes Metropolitan Planning Organization What is the Travel Demand Model? VLMPO CAC-TAC Joint Meeting April 23, 2014
  2. 2. Why are we here? • Assumption: Land use policy decisions impact transportation infrastructure (investment and costs) • Demonstrate how the VLMPO-JLUS 2035 Travel Demand Model can be used to show impacts on transportation infrastructure based on land use policy decisions.
  3. 3. Agenda • What is the Model? • How does the Model Work? • How is the Model used in Transportation? • How is the Model used in Land-Use Policy? • What will Local Officials Learn about Land- use and transportation policy from the Model Outputs?
  4. 4. What is the Model? The Travel Demand Model is a tool (one of many) that can be used to provide more information to decision makers on transportation issues. The TDM should not be used as the final determining factor in any decision, it should be one of many resources and inputs considered.
  5. 5. What is the Model? • The model is the data, not the software – Traffic Analysis Zones (TAZs) – Road Networks – Socioeconmic Data (tabulated at TAZ level) • Population • School Enrollment (school location) • Retail Employment • Wholesale Employment • Service Employment • Manufacturing Employment • Households • Income • Lots of Regional and National Defaults (can be changed)
  6. 6. Traffic Analysis Zones
  7. 7. Highway Network
  8. 8. Two Models • VLMPO 2035 Model – Covers only MPO Jurisdiction • VLMPO-JLUS 2035 Model – Covers MPO Jurisdiction plus JLUS Study Area • VLMPO 2040 Model – Covers expanded MPO Jurisdiction
  9. 9. What do drivers tend to do when a roadway becomes congested?
  10. 10. Travel Demand Model
  11. 11. Socioeconomic Data
  12. 12. Future Growth Consensus
  13. 13. Socioeconomic Data
  14. 14. Socioeconomic Data
  15. 15. Travel Demand Model
  16. 16. 4-Step Model 1. Trip Generation – Number and Type of Trips Each TAZ Produces or Attracts is Calculated 2. Trip Distribution – Trips are Distributed by TAZ from Origins to Destinations 3. Mode Split – Assigns Trips to Cars, Public Transit, Biking, Walking, etc. – Not Used in VLMPO TDM, Alternative Modes not Large Enough 4. Trip Assignment – Trips are Assigned to Highway Network, Using Shortest Path – Once Roadway Becomes Congested, Next Shortest Path is Used
  17. 17. What do the Outputs Look Like?
  18. 18. What does it mean? • Roads are assigned a Level of Service (A thru F) Grading Scale – A=Good, Free Flowing Traffic at Peak Travel Time – F=Very Bad, Standstill Traffic at Peak Travel Time • Planners and Engineers then develop transportation projects to ease congestion on links where Level of Service is improved
  19. 19. LOS
  20. 20. Examples • Exit 2 Lake Park Bellville Road • Oak St/Woodrow Wilson Area • Bemiss Rd and Forest Street Corridors
  21. 21. Scenarios 1. Land Use Inputs for Forrest St. 2. 2035 No Build – 2 lane, other inputs 3. 2035 Build – 5 lane, with school, Park 3 lane 4. 2035 – 4 lane, w/o school, Park 3 lane 5. 2035 – 5 lane, w/o school, Park 3 lane
  22. 22. Scenarios • Can be changed at any time, most all assumptions can be tweaked to answer the questions of local officials • Is macro, not parcel specific

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