A picture of the problem

The thing is, transport is a systems problem – lots of interlocking factors, change any one of them and the others will change in turn. Difficult to get a proper handle on and so really, you do need a diagram:

(Source: the Levett-Therivel sustainability consultants. This graphic is quite well-known, I think, and I found this copy here.

Also by Roger Levett: an astute discussion of how government actually behaves.)

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