Darren New wrote:
> 
> Given the hint that they're all round in the street and they're not 
> round on the sidewalk... any more takers?

I can't actually agree on this, but it can depend on the country etc, so 
that doesn't matter. There's 2 reasons:
1) No corners -> no tire fatalities.
2) Harder pressure on ground surface (there can be tonnes of masses on 
one axle on the street) -> harder construction (cylindrical shape is 
better to handle pressure from outside).

-- 
Eero "Aero" Ahonen
    http://www.zbxt.net
       aer### [at] removethiszbxtnetinvalid

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