https://www.cnet.com/roadshow/news/waymo-releases-its-autonomous-driving-report-card-for-california/

The disengagement report is an interesting measure of how effective a given company's -- in this case Waymo's -- platform is in the real world. The report sums up the number of disengagements that occurred during the period between December 2016 and November 2017, and the number of incidents for the number of miles traveled is pretty impressive.

"We're building the most experienced driver on the road with 4 million miles of testing in 25 cities, as well as driving on our private test track and in simulation. Our low disengage rate shows continued improvement year over year," a Waymo spokesperson said in a statement to Roadshow.