In Chapter 11 it was argued that any proposed intervention into the transport system should be properly assessed both before and after its implementation – before, so that the number of unwise interventions may be minimised; after, to establish whether the intervention had been worthwhile. This second analysis may appear to be no more than belatedly identifying regretted mistakes, but it is actually a very important contribution to recognising which sorts of interventions are likely to be the most effective – the popularly named ‘learning curve’. The assessment rests on ten stages:
measuring the existing movement through the system;
forecasting the future movements if things are left as they are;
forecasting ...
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