Do you see how the horseless carriages were whipping in and out of lanes of travel? The problem is that the human body was not meant to travel at those kinds of speeds. It is dangerous!
Heh... the tech used for this video has only one problem, analogous to what happens in old westerns from Hollywood — the wheel spokes. In many scenes in old Hollywood movies, the wheels appear to be turning backwards. In this video, they appear to not be turning at all, for the most part.