These are very common today. I have family that uses them. That being said, they're usually still piloted and they mostly use them because they're more accurate than trying to drive them, but they need to be there when things inevitably go awry.
2014-12-29 11:11 GMT-10:00 H Veeder <hveeder...@gmail.com>: > Driverless farm tractors > > > http://fortune.com/2014/12/29/driverless-tractors-on-the-farm/?xid=yahoo_fortune > > Harry
