Well, this will certainly get 'em to slow down...
 

So, we want people to slow down and thereby conserve fuel, correct?

I think we should lobby our collective congresspersons for the (link NSFW) Danish system

scroll down to the end of the post and watch the embedded video.

*Warning* I didn't embed the video here because of it's, shall we say, gratuitous display of the female chest-area.

Haha - I'm not saying it wouldn't work but...

(editing your post to add NSFW)

Oh, those Danes.

Hilarious. And it would be perfectly legal in Ontario! Although impractical for half the year.

What a lovely view.