"The simulations were not conducted independently of the company, nor were they reviewed by any third-party for verification prior to the company making them public." from https://www.theverge.com/2021/3/8/22315361/waymo-autonomous-...
"This research was made possible because of the thorough crash reports the Chandler Police Department and Arizona Department of Transportation (ADOT) prepare following fatal crashes, and we’re grateful to ADOT, Chandler Police Department, and Arizona Department of Public Safety for making these reports available to the public upon request."