Abstract
A TRIP DISTRIBUTION, MODAL SPLIT AND TRIP ASSIGNMENT MODEL IS DEVELOPED. AS IS WELL KNOWN, THE ENTROPY TYPE DISTRIBUTION MODEL IS EQUIVALENT TO POSTULATING A TRAVEL DEMAND FUNCTION WHERE TRIPS ARE PROPORTIONAL TO A NEGATIVE EXPONENTIAL FUNCTION OF THE TRAVEL COST. IT IS SHOWN THAT WHEN TWO DISTRIBUTION MODELS OF THIS TYPE ARE LINKED WITH ROUTE CHOICE MODELS BASED ON WARDROP'S "USER OPTIMIZED" PRINCIPLE, THE MODE CHOICE IS GIVEN BY A LOGIT MODEL. A SOLUTION ALGORITHM IS DEVELOPED THAT COMPUTES THE RESULTING TRIP INTERCHANGES AND ROUTE FLOWS.