Benedict Evans brings up a some insightful questions for electric and autonomous vehicles becoming mainstream:

If autonomy ends accidents, removes parking and transforms what congestion looks like, then we should try to imagine changes to cities on the same scale as those that came with cars themselves. How do cities change if some or all of their parking space is now available for new needs, or dumped on the market, or moved to completely different places? Where are you willing to live if 'access to public transport' is 'anywhere' and there are no traffic jams on your commute? How willing are people to go from their home in a suburb to dinner or a bar in a city centre on a dark cold wet night if they don't have to park and an on-demand ride is the cost of a coffee? And how does law enforcement change when every passing car is watching everything?