They do have a working prototype; it's in the video.
Also, your comment is ironically pretty dismissive.
As an expert, do you think that the sporadic time/money cost of changing a tire could offset a significant reduction in fuel cost or trip time? How expensive would a tire change have to be to outweigh, say, a (conservative) 30% reduction in fuel cost?
Also, your comment is ironically pretty dismissive.
As an expert, do you think that the sporadic time/money cost of changing a tire could offset a significant reduction in fuel cost or trip time? How expensive would a tire change have to be to outweigh, say, a (conservative) 30% reduction in fuel cost?