>> 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.
>>
>
> Well yes, in some countries. Germany's highways are pretty great 
> infrastructure, for example,

I think it would also work well in the UK, France and Italy from what I've 
personally experienced.  In Germany they could simply say that all cars 
above a certain pollution level are always limited to a maximum of 120 
km/hr, even if there is no limit at that point.  If they fixed it so that 
that "certain level" meant around 50% of new cars sold before were either 
side of the limit, then I suspect it would significantly reduce pollution 
(due both to people buying greener cars, and people going slower with the 
more polluting cars).

> but ie. in Finland there's rarely over 200km of highway/multi-lane on 
> 500km trip.

Well yes (I experienced a crazy 3-lane road once in Finland where the middle 
lane was for both directions!), but at least on those single-lane roads 
there isn't so much traffic that you never get an opportunity to overtake!

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