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U.S. to decide soon on GM's request to deploy cars without steering wheels
(www.autoblog.com)
This is a most excellent place for technology news and articles.
https://storage.googleapis.com/waymo-uploads/files/documents/safety/Safety%20Performance%20of%20Waymo%20RO%20at%201M%20miles.pdf
This is waymo, not cruise, but it's a comparison between 1 million miles with no humans behind the wheel and the human average. That's about 80 years worth of human driving, and while that's not long enough to provide meaningful data on reducing fatalities, they do show that self driving cars reduce both the frequency and severity of more minor accidents