2. A trip-chain based combined mode and route choice network equilibrium model
2.1. Assumption of the model
In this paper, two travel modes are assumed to be available; private car (automobile) and public transportation
system with walking arcs. We only consider buses as the public transportation system, whose travel time is affected
by the number of private cars on roads but not affected by the number of passengers on buses. Under this
circumstance, we consider a nested-logit distribution to model the disaggregation of the demand by modes and
routes as shown in Figure 1 . In this framework, the travellers are assume to choose their travel mode by considering
the cost of the trip chain, and then, they are assigned to the private car (PC) network and the public transportation
(PT) network according to the mode choice probabilities.