You can design anthing you want but it will take years to turn over the vehicles already on the road. I know many people who hang onto their vehicle until the wheels fall off (ecomodders comes to mind). Also many people who make a good living who have never owned a new vehicle they only buy from the secondary market. When I lived in Pa the average car was 10-20 years old in some communities. Having it available is nice but implamentation is years in the future. Speed limits are available now. Do we have years? The only thing that is encouraging them now is fuel cost. If you have a paid for vehicle it's a lot easier to come up with $4+ a gallon gas than if you have a car payment. I heard this argument yesterday. When you factor in the cost of a new fe vehicle he's still ahead of the game for a long time dirving his old car. One thing I have noticed is this has made a lot of people slow down. Slowing down saves a lot of fuel more than tire air pressure and not idling.
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