https://www.cnbc.com/2018/06/13/alphabet-waymo-testing-early-riders-interview-with-saswat-panigrahi.html

For slightly more than a year, 400 volunteers have tested out Waymo's self-driving car service in Phoenix, Arizona, for free, letting the driverless vehicles whisk them to work, shopping centers, the bar, or anywhere else within a 100-square-mile radius.

In that time, these riders have been filing the non-technical equivalent of bug reports, using the cars' rider support call buttons and in-app feedback forms to point out issues with the service and highlight use cases that Waymo researchers might have missed.