Some ideas are destined to never work.
The hoverboard is one. So is the flying car. A peanut-butter-and-sardine sandwich would also make the list of ideas not likely to catch on.
The state of Oregon is about to discover one more: a miles-driven tax in place of a fuel tax.
The slow rise of electric and hybrid vehicles, in addition to improved fuel economy in vehicles powered by fossil fuels, has presented state governments with a new problem: how to fund roads with less money coming in from fuel taxes.