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A similar functional relationship may be assumed in order to model trip attraction, provided that the independent variables are causal. this can be done through multiple regression analysis or Cobb-Douglas type production functions. Because travel demand is a 'derived demand,' it is usually effective to correlate trip generation with some explanatory variables, such as population, employment, income, etc. Most of the classical travel demand simulation processes originated during the sixties. He is on the Editorial Board of Transportation Research.

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He currently specializes in logistics systems analysis, and has been involved in professional projects such as Intermodal Transportation Plans for Barcelona, Zaragoza, Malaga, and Vigo. in Engineering from the University of California at Berkeley. He received the Doctorat in Civil Engineering from the Universitat Politècnica de Catalunya, the Master of Science in Operations Research, the Master of Engineering in Transportation and the PhD. Transportation modeling A typical modeling processįrancesc ROBUSTE is Associate Professor of Transportation at the Escola Tècnica Superior d'Enginyers de Camins, Canals i Ports de Barcelona. Finally, the third part includes several other conjectures regarding transportation networks and regional development most of these conjectures are based on logistics principles of system efficiency. The conjectures here focus on short-run and long-run system efficiency, to conclude that pricing should be closely related to activity location management. The second part deals with transportation network pricing. The first part describes the recent simulation model of the highways in Catalonia: after reviewing the typical modeling process, several conjectures are formulated about the models' forecasting accuracy.

The conjectures are such in the sense that they are not formally proven, but some ideas are drawn from the direct experience obtained in Catalonia or in the Barcelona Metropolitan Area. Tihis paper reviews several issues regarding transportation networks and regional development, and formulates several conjectures.

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