A driverless car is already loaded up with all the sensors you need to fully map the road. Google's cars start with an extremely detailed map of the road, incl

A driverless car is already loaded up with all the sensors you need to fully map the road. Google's cars start with an extremely detailed map of the road, including where the lanes are and where everything should be. And, every time a Google car drives the road, that map can be updated. This obviously isn't ready to deploy nation-wide right now, but there's a pretty obvious growth path here. If you were to buy a Google car for your commute, you might have to manually drive it for several days in order for it to learn everything it needs to know. Eventually, the other self-driving cars on the road will also be helping build a map for you, and you for them.