I think self-driving cars will be more common by 2030, but not the primary mode of transportation, at least not in major U.S. cities. There are still too many challenges, from regulations and infrastructure to public trust and cost. Plus, cities like NYC and Chicago already rely heavily on public transit, so mass adoption might take longer. That said, I wouldn’t mind a self-driving Uber after a long night out. I recently had to call FasTrak customer service about a toll issue, and I can’t imagine how they’ll handle self-driving cars using express lanes.