Skip to main content

Travel Demand Forecasting: Parameters and Techniques (2012) / Chapter Skim
Currently Skimming:


Pages 1-6

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 1...
... Both the transferable parameters and the travel measures come from two main sources: the 2009 National Household Travel Survey (NHTS) and a database of model documentation for 69 metropolitan planning organizations (MPOs)
Read the entire page →
From page 2...
... This report is organized as follows: • Chapter 1 -- Introduction; • Chapter 2 -- Planning Applications Context; • Chapter 3 -- Data Needed for Modeling; • Chapter 4 -- Model Components: – Vehicle Availability, – Trip Generation, – Trip Distribution, – External Travel, – Mode Choice, – Automobile Occupancy, – Time-of-Day, – Freight/Truck Modeling, – Highway Assignment, and – Transit Assignment; • Chapter 5 -- Model Validation and Reasonableness Checking; • Chapter 6 -- Emerging Modeling Practices; and • Chapter 7 -- Case Studies. This report is not intended to be a comprehensive primer for persons developing a travel model.
Read the entire page →
From page 3...
... Trip generation models require some explanatory variables that are related to trip-making behavior and some functions that estimate the number of trips based on these explanatory variables. Typical variables include the number of households classified by characteristics such as number of persons, number of workers, vehicle availability, income level, and employment by type.
Read the entire page →
From page 4...
... This step consists of separate highway and transit assignment processes. The highway assignment process routes vehicle trips from the origin-destination trip tables onto paths along Forecast Year Highway Network Forecast Year Transit Network Forecast Year Socioeconomic DataTrip Generation Model Internal Productions and Attractions by Purpose Trip Distribution Model Mode Choice Model Person and Vehicle Trip Tables by Purpose/Time Period Time of Day Model Person and Vehicle Trip Tables by Mode/Purpose/Time Period Highway Assignment CHECK: Input and output times consistent?
Read the entire page →
From page 5...
... However, analysts should be aware that many of the analysis procedures discussed in the report that use travel times as inputs (for example, trip distribution and mode choice) are affected by changes in travel times that may result from the use of feedback methods.
Read the entire page →
From page 6...
... For transit trips, this is the time spent in the transit vehicle and does not include walk access/egress time, wait time, or time spent transferring between vehicles. Usually, transit auto access/ egress time is considered in-vehicle time.
Read the entire page →

Key Terms

  • transit line
  • trip attraction
  • mode choice
  • user benefits
  • trip generation

  • auto access
  • choice model
  • commercial vehicle
  • trip production
  • highway network

  • federal highway
  • local bus
  • income level
  • vehicle availability
  • availability models

  • choice models
  • planning organization
  • generation models
  • highway administration
  • transportation plan

  • trip table
  • metropolitan planning
  • transit network
  • truck trip
  • federal transit

  • rider surveys
  • availability model
  • wait time
  • truck modeling
  • travel time


    • This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
    More information on Chapter Skim is available.