I've found 60 fps is needed to reliably snag details like license plates. I've tried a couple of my digital still cameras with video options and consistently caught more detail at 720/60 fps than 1080/30 fps. There were still plenty of blurred frames, but 60 fps improves the chances of getting at least one clear frame of the license plate or other crucial detail.

I stopped using my P&S digicams as bike video cameras because the vibrations were rattling the telescoping lenses too much. But I'd want a dedicated action cam with at least 720/60 capability.