.
.
.
n
Dj

Tom V. Mathew and K V Krishna Rao

When information is available on the growth in the number of trips originating and terminating in each zone,
we know that there will be different growth rates for trips in and out of each zone and consequently having
two sets of growth factors for each zone. This implies that there are two constraints for that model and such a
model is called doubly constrained growth factor model. One of the methods of solving such a model is given
by Furness who introduced balancing factors ai and bj as follows:

3. Do not consider changes in travel cost.

CHAPTER 8. TRIP DISTRIBUTION

(8.12)

Tom V. Mathew and K V Krishna Rao

1
ΣBj Dj f (cij )

Tom V. Mathew and K V Krishna Rao