page_title: Trip distribution
hierarchical_section_title: Trip distribution
caption_attribution_description: English: Sign near roundabout on the R449 near Leixlip, County Kildare
context_page_description: Trip distribution is the second component in the traditional four-step transportation forecasting model. This step matches tripmakers’ origins and destinations to develop a “trip table”, a matrix that displays the number of trips going from each origin to each destination. Historically, this component has been the least developed component of the transportation planning model.
  Where: T ᵢⱼ = trips from origin i to destination j. Note that the practical value of trips on the diagonal, e.g. from zone 1 to zone 1, is zero since no intra-zonal trip occurs.
  Work trip distribution is the way that travel demand models understand how people take jobs. There are trip distribution models for other activities such as the choice of location for grocery shopping, which follow the same structure.
context_section_description: Trip distribution (or destination choice or zonal interchange analysis) is the second component (after trip generation, but before mode choice and route assignment) in the traditional four-step transportation forecasting model. This step matches tripmakers’ origins and destinations to develop a “trip table”, a matrix that displays the number of trips going from each origin to each destination. Historically, this component has been the least developed component of the transportation planning model.
  Where: T ᵢⱼ = trips from origin i to destination j.  Note that the practical value of trips on the diagonal, e.g. from zone 1 to zone 1, is zero since no intra-zonal trip occurs.
  Work trip distribution is the way that travel demand models understand how people take jobs.  There are trip distribution models for other (non-work) activities such as the choice of location for grocery shopping, which follow the same structure.
caption: All trips have an origin and destination and these are considered at the trip distribution stage.
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