I've often wondered that. The town I live in has no zoning, so they follow the state code, which, of course, follows the ICC.
Talk about ambiguous. Allowed one unlicensed vehicle. Anything else is considered "junk." Junk is described as being in a state of being parted out and/or scrapped.
The loophole, though, is if you have intent on driving it on public highways again.
If that's the case, then how can code know my intent without asking me? And if I say I'm restoring it and intend to drive it again, then how can they disprove it?