TRAVEL TIME BUDGET IN TRANSPORT NEWTWORK WITH STOCHASTIC DEGRADATIONS

Recent empirical studies have suggested that travel time reliability plays an important role in travelers' route choice behavior. This study proposes an approach to relate travel time variability due to stochastic network link capacity degradations to travelers' corresponding route choice behavior. We postulate that travelers acquire the variability of route travel times based on past experiences and factor such variability into their route choice consideration in the form of a travel time budget. This travel time budget varies with individuals and with trip purposes and is related to the requirement on punctual arrivals. Moreover, all travelers want to minimize their travel time budgets. We formulate this route choice behavior in a mix-equilibrium formulation with multiple classes of travelers, each class with a different requirement on punctual arrivals. Numerical studies are conducted to demonstrate the properties of the models