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>> 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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