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 . Granted, the company has never said anything remotely useful about when it might be ready, where it might be used, or what people will do with it. 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 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 .