I'm more surprised that this is not already the case as the farming machines as they commonly use GPS to precisely follow the path on the land they work on. It

I'm more surprised that this is not already the case as the farming machines as they commonly use GPS to precisely follow the path on the land they work on. It's also much less formidable landscape than driving autonomous vehicles among the humans. 1) The area that these machines work is already considered an insulated work space, you would not expect to have humans on the grounds when the autonomous machines operate. 2) These machines make a lot of noise and move very slowly, which would allow humans to protect themselves from machines that misbehave 3) The farming equipment is already bulky and doesn't need considerations for things like aerodynamics, which means that all kind of sensor and extra equipment can be attached. 4) The business model can tolerate cost increase, it's very common for these machines to be time shared between users. I'm looking forward for a future where being a farmer means machine management from a comfortable room. The traditional farming is so dirty and hard job that most young people are avoiding it at all cost and this is not a business that can cease to exist as farming is what makes our civilisation exist.