Google 's fleet of 341 self-driving cars has passed the 2 million miles on the road mark, putting the likes of Dolgov , which has autonomous taxis operating in Pittsburgh , Pittsburgh , in the shade. Google second began dabbling with self-driving science in 2009 , and lead engineer Dmitri Dolgov said the first 90% of the work is easy, but the last 10% is hard as it "requires teaching the car to handle edge cases". Google 's self-driving car has required human intervention 341 times 2 million miles . Uber has a small fleet of self-driving cars ferrying people around downtown Pittsburgh, Pennsylvania, right now. As well as operating on roads, Google simulates 3 million driving miles each day .
Google 's fleet of 341 self-driving cars has passed the 2 million miles on the road mark, putting the likes of Dolgov , which has autonomous taxis operating in Pittsburgh , Pittsburgh , in the shade. Google second began dabbling with self-driving science in 2009 , and lead engineer Dmitri Dolgov said the first 90% of the work is easy, but the last 10% is hard as it "requires teaching the car to handle edge cases". Google 's self-driving car has required human intervention 341 times 2 million miles . As well as operating on roads, Google simulates 3 million driving miles each day .