I'd say that the camera is mounted on a motorcycle with a stabilized pole mount, and you can hear the tires screaming around some of the curves. Also, when they pass the bike near the end, the camera doesn't have to move over too much to make the pass, if the camera was on a car, much more room would be needed (going into the other lane more) to complete the pass.
If I did this I would be wearing a titanium cup... just in case!
Roger