https://techcrunch.com/2017/10/03/gms-cruise-explains-why-self-driving-tests-in-dense-cities-gives-it-an-edge/

GM is sharing more info about its testing process for autonomous cars through Cruise, the startup it acquired last year. For the first time, Cruise has shared some numbers related to the advantages it says its program has by placing emphasis on city testing, vs. testing only in less densely occupied areas.

“Cruise does the majority of its testing, or at least a significant portion of it, in San Francisco, and in particular the most dense part of San Francisco,” explained Cruise CEO and founder Kyle Vogt on a call related to the news.