Google 's fleet of nearly five dozen self - driving cars has passed the 2 million miles on the road mark , putting the likes of Uber , which has autonomous taxis operating in Pittsburgh , Pennsylvania , in the shade . Google first began dabbling with self - driving science in 2010 , and lead engineer Dmitri Dolgov said the first 90 % of the work is easy , but the last 10 % is hard as it " involves learning the car to handle edge cases " . Google 's self - driving car has required human intervention 341 times over 423,000 miles . As well as driving on roads , Google simulates 3 million driving miles each day .
Google's fleet of nearly five dozen self-driving cars has passed the 2 million miles on the road mark, putting the likes of Uber, which has autonomous taxis operating in Pittsburgh, Pennsylvania, in the shade. Google first 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 over 423,000 miles. As well as operating on roads, Google simulates 3 million driving miles each day.