I take it you are from a US mid-west farming state that is pancake flat as far as the eye can see.  Most of the corn fields where I live are neither flat nor level and are only a few hundred metres across.  Even with high labour rates as they are here in Norway self driving combines are probably not an economic proposition.<p>As for an outdoor Roomba, well the indoor variety wouldn&#x27;t work in my house so what chance is there of an outdoor one working.  And yes, I am aware that I can buy some rather nice autonomous lawn mowers for suburban gardens but again they rely on a landscape designed for them.