Driver interventions, on a few streets, with highly instrumented cars. But compared to public roads warehouses are easy. There isn't fog or rain or snow. There aren't potholes. The light doesn't change. And to prove my point: look at all these self-driving cars on the streets today.

It's a peculiar case of Bay Area Tech brain. "We very rarely kill pedestrians in SF and Arizona. I'm sure this tech will work fine in Ohio."