What if riders don't close a robotaxi door after a ride? Try DoorDash.

Autonomous vehicles have a lot of potential. As long as you program them right, they won't speed, won't break traffic laws, and won't get drunk, high, abusive, or violent. And the technology has been getting much more capable, even as some of the hype has died down, taking some of the related companies with it. Waymo still easily leads the field and is already operating commercially in six cities across America, with a dozen more (plus London) coming soon. Waymos can even drop you off and pick...