https://www.cnbc.com/2017/08/23/alphabet-waymo-uses-carcraft-software-castle-base.html >Alphabet's Waymo subsidiary is training self-driving cars by using virtual worlds and a real-world testing ground near Merced, California, according to a report in The Atlantic. >The report offers new insight into the massive effort Alphabet is expending in self-driving cars, and suggests how hard it will be for other companies to catch Waymo, which began as a Google division eight years ago.