Components of a Transportation / Land Use System
A transportation / land use system can be divided in three subcategories
To provide a comprehensive modeling framework, all these models must
share information to form an integrated transportation / land use
model. For instance, a land use model can calculate traffic generation
and attraction, which can be inputted in a spatial interaction model.
The origin-destination matrix provided by a spatial interaction model
can be inputted in a traffic assignment model, resulting in simulated
flows on the transportation network.
- Land use models are generally concerned about the spatial
structure of macro and micro-economic components, which are often
correlated with transportation requirements. For instance, by using
a set of economic activity variables, such as population and level
of consumption it becomes possible to calculate the generation and
attraction of passengers and freight flows.
- Spatial interactions models are mostly concerned about
the spatial distribution of movements, a function of land use (demand)
and transportation infrastructure (supply). They produce flow estimates
between spatial entities, symbolized by origin-destination pairs,
which can be disaggregated by nature, mode and time of the day.
- Transportation network models are trying to evaluate
how movements are allocated over a transportation network, often
of several modes, notably private and public transportation. They
provide traffic estimates for any given segment of a transportation