Greg F. said way back up there ^

"There IS no public transport worth the name in the U. S. of A."

I must disagree... the Washington D.C. metro area, being one of the most traffic-congested areas, has a pretty good system. Of course, it IS possible to find a place to live that is way down a side street or at the end of an odd lane where access is a problem, but most folks live within a 5-10 minute walk of bus or subway.
Not only that, but bike lanes are being added, a new trolley line has just been added in D.C., and studies are under way for MORE transit. The current drop in gas prices has cut ridership, as people will choose their private car when it saves them a bit of time & money, but the situation WILL make public transit more & more necessary in the future.

Nothing will change the need for a car for some purposes... you can't easily do family grocery shopping on a bike.. or take 4 instruments to a sing on the other side of town... but I know a woman who is blind who often goes to sings. (She 'sometimes' asks for a ride from the bus stop, but can do the major parts of the trip on her own.)

The USA is a very big place, and motor vehicles (including trains) are all that make it possible to get around. Elon Musk is trying to see that alternate forms of power are available in the future. We shall see.