in the course of work on the cristal transport planning model of greater london, a greatly simplified "single-link" version of the model has been developed. in this, various parts of the area are treated as if traffic conditions were uniform over the area represented; this leads to a model which has definite limitations but which over a limited range of applications can give very rapid assessments of alternatives. this paper describes the model, the data used to set it up and the results of some applications to restraint and fares policies. these applications are mainly concerned with sensitivity tests, with alternative assumptions and with variations on the main policy options; the main policy options themselves have been dealt with more satisfactorily by the network version of the model. like the network model, the single-link model only deals with traffic effects and their direct economic consequences, and not with the wider social environmental or political considerations. (a)

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