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I recently visited the in-laws in Colorado and got to drive an autonomous John Deere. It wasn't the most sophisticated tractor that's available, as I still had to do the turns at the end of a run, but once you make the turn and get within ~3 feet of the proper line and push a button, the steering goes under GPS control and is maintained within a 4" distance. The advanced systems can make the turns and keep under 1" of precision.
100 passes and 8hrs later, I was still marveling in the technology. Farming will one day be driverless, with a single technician monitoring a number of tractors.
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