I have a $100 bet going with a coworker at the office.<p>We defined self-driving cars: When I can pull out my phone in any of at least 5 major metropolitan areas around the world, order a driverless car, have it pick me up and deliver me to a specified location within the city in a timely fashion, with as little risk as getting in a taxi.<p>He is sub 20 years. I&#x27;m thinking more like 40-50 mark.<p>My thesis? We can solve the technical challenges, but so much physical, legal, and regulatory infrastructure needs to change to make this viable that it will be more than 2 decades until we see self-driving cars as a reality across multiple cities. Of course, I would be more than happy to lose the $100 as it would make everyone&#x27;s lives better that much sooner. But I&#x27;m skeptical.