Adrian wrote:

The _right_ question for short urban journeys is "Why are people using
private cars instead of public transport?"

That's easy. Public transport is crap and an unusable replacement for
the vast majority of vehicle miles currently driven.

Even if public transport was good, you would still have a major problem
persuading people to use it since it is going to be hugely difficult to
compete with the freedoms that drivers are now accustomed to. (i.e. A
door to door service, in your own private air conditioned space, with
your own choice of music, and no other people in your face to put up
with).


--
Cheers,

John.

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