I had a caller just now with an interesting question. Right now, in Tennessee and I'm sure in a lot of other places, gasoline tax revenue plays a major part in the cost of maintaining and upgrading roads and highways. That's a relatively-straightforward case where the users of a service help to maintain it, something that's not always possible with government services and revenue sources.
Right now, the percentage of electric cars is still quite small, but as it continues to grow, will that have an impact on the available funds for maintaining road infrastructure? If so, how will the tax structure have to change to make sure that roads can be maintained?
It may be a few years before fully-electric cars make enough inroads to put a big dent in the gas tax revenue, but it's something that probably needs to be considered, sooner rather than later.