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" ... Cars tested with the pool will be able to know they can handle everything that human drivers would see in many lifetimes of driving. In particular, they can be tested against the unusual situations that create risk. They can also be tested against variations of those situations. You can take a sitaution and say, “try it if the other car shows up 1 second earlie ror later, or 2 seconds, or 3. Test it if the car is one foot to the left or right. Test it in heavier or lighter traffic. Test it in rain or snow. Every scenario lets us learn if there is anything that trips up the self-driving system and creates an accident. ... "