International and interregional trade and transport are on the rise and hence, there is a clear needfor reliable estimates of transport flows. However, the available databases and estimation methodsare not yet satisfactory for analytical and predictive purposes.In this paper we explore the use...

1. The nature of transport -- 2. The mobility of goods -- 3. The production of transport -- 4. The freight system : the companies -- 5. The freight system : the public powers -- 6. Trends, future developments and conclusion.