I think that we really need to put a bunch of different technologies and changes into effect. Lighter cars and trikes such as the tri-magnum
http://www.rqriley.com/tri-mag.html would be great for local family commutes and trips. BUT.... driving a car like that on the same roads as 18 wheelers would be dangerous. high winds and whatnot. The XR-3 will be a future project of mine. solar power won't work in many places.
I'm off to work now. Love to keep this going though.