Ummm..OK.
There should be no need to register an AUTOMOBILE (and in most cases there isn't) which is:
- on the operator’s property w/in a reasonable setback from the property line
- operating at a reasonable height
- operating at a reasonable speed.
Except that some automobile owners are not going to abide by those restrictions.
I think the idea here is to deter some folks from doing stupid things, because their UAV can be traced back to them if it crashes.