>> Have different speed limits depending on how much pollution your car 
>> produces.  Allow the most fuel efficient cars to go slightly faster than 
>> they can today, and make other cars go slower.  In the centre of cities
>
> That would require more lanes. On a normal 2-lane (1 per direction) road 
> different limits on same-class cars only generates angry drivers, while 
> the traffic ain't smooth and easy anymore, but there's lots and lots of 
> overtakes going on all the time.

Yeh I was thinking of just on the multi-lane-per-direction roads, as they 
are the ones mostly used for long distances where a higher speed limit might 
be an incentive for people to buy greener cars.

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