They don't :). Its upto you to make sure it doesn't crash into anything. Its not a co-incidence that all the videos of this tech is shot in large open fields ;)

They don't :). Its upto you to make sure it doesn't crash into anything. Its not a co-incidence that all the videos of this tech is shot in large open fields ;) Obstacle avoidance is coming though! The research world is converging on a solution!