Urban trip prediction process is among the most important parts of the traortation planning. This process is appertain to urban traortation planning and its utilization with accordance to effective data and exact analysis could use for future development as an instrument. Conventional process of trip prediction in evaluation of traortation projects has a general structure that modal choice (modal split) models a part of such structure. This model should be sensitive to different traffic politics. At this time, available modal choice model for Isfahan has been estimated based on travel time and car ownership. So, lack of effective parameters such as trip cost caused to a decrement in the accuracy of models. In the past, trip cost factor has not an important parameter, because fuel cost was to some extant cheap. But in recent years, as for government politics in elimination of subsidies and the effect of these politics on public traortation situations, considering of trip cost in modal choice seems to be necessary. In this study, existing modal choice models of Isfahan have been reviewed considering trip cost and travel time value. In this way, at first a model has been generated for taxi- mode. This model is calibrated using data achieved from taxi office following , considering fuel price congestion of the routes , a model have been evaluated for trip cost using personal cars. Then, these models have been used to estimate the utility of different modes. Utility functions has been generated calibrated for personal cars, taxi, bus, motorcycle bicycle. The structure of utility function in different trip targets were considered constant and then these functions were modified calibrated on the basis of different trip targets. Finally, the utility functions (utility models) have been calibrated using statistics data achieved from the first phase of comprehensive study of Isfahan traortation. The result of this study is modification of available models that were not sensitive to trip cost parameter. These models could help Politian for pricing of different modes. Keywords: Trip Pridiction Process, Traortation Planing, Modal Choice, Trip Cost
