&gt;My position in this discussion is that yes, infrastructure improvements are necessary, but they&#x27;ll be relatively straight forward in the US, as basically every city in the US was designed to support automobile traffic.<p>This is not to say that it&#x27;s impossible, but US cities barely manage to get the infrastructure upgrades and maintenance they need now - Google et. al. have a lot of money, but I&#x27;m not confident they can play bureaucracy well enough to get some of the infrastructure improvements necessary for either large fleets of SDC&#x27;s. I admit, the idea of replacing all the individually owned cars on the road with a fleet of summonable automobiles is very appealing; it just seems like there are a lot of intermediary steps that are less about technology and money than they are about politics and personal interests.