The CEO of Uber, Travis Kalanick, has been quoted as saying that if Tesla Motors manages to launch its RoboCar autonomous vehicle by 2020, he'll buy 500,000 of them.The American Learn Bonds website reports that Tesla is due to put its self-driving car on the road this year and that it expects to produce half a million by the end of the decade including a sedan, SUV and mid-range car. If Uber could get rid of the drivers that form the basis of its business, says the report, it would expand its margins, change the nature of transport forever, and make its investors very, very wealthy.Tesla Motors is due to release the Model S this year which, on private land, will be able to park itself in the garage and drive out to meet drivers when summoned.  However legal barriers mean it will be some years before it can drive on the highway.