Module 2: Transportation planning

Lecture 8 Trip distribution

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Growth factor methods

Uniform growth factor

If the only information available is about a general growth rate for the whole of the study area, then we can only assume that it will apply to each cell in the matrix, that is a uniform growth rate. The equation can be written as:

$$T_{ij} = f\times t_{ij}$$ (1)

where $f$ is the uniform growth factor $t_{ij}$ is the previous total number of trips, $T_{ij}$ is the expanded total number of trips. Advantages are that they are simple to understand, and they are useful for short-term planning. Limitation is that the same growth factor is assumed for all zones as well as attractions.