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The article presents an improved and refined version of the snus-1 model, which was documented only in French. The greatest difficulty faced in the development of the model did not have to do with structure-the multilevel structure is straightforward-but with the specification of the employment activity variable, due to the specifics of the German economy, and with the proper formulation of the role of vehicle stocks in the road demand models. The following aspects are special in the context of an analysis in Germany: (1) there exist no general speed limits on motorways, i.e., about 70% allow unlimited speed today, and in the Sixties, this share was even higher; (2) the country is large compared with other regions were the DRAG-methodology is employed, and it possesses high car ownership levels and an important car industry that sees the German infrastructure as an appropriate testing ground; (3) Germany is poly-central, its infrastructure resembles a grid, whereas France's is almost a hub-and-spoke system, as compared for instant to Norway's line; and (4) unification is not yet included because of lagging data availability and, thus, problems to compensate for the structural break in data series. In terms of econometric analysis, the TRIO-LEVEL algorithm was applied in new ways, both in the analysis of the functional forms and the evaluation of multi-moment determination of the models.
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