It varies by state and local governing bodies.

Registered aircraft may have different rules from ultralights.
Where local zoning may ban registered aircraft, it may allow
ultralights.

Some states will allow you to land and take off from interstate
highways, others may require the aircraft to be disassembled and
trucked out.
In Alaska, as you drive down a two lane road, you may see signs that
state "AIRCRAFT HAVE RIGHT OF WAY ON ROAD".

On private land, the owners permission is, as a general rule, required.

The rules are all over the place.