Originally Posted by
RichardKenner
Such a regulation can't possibly exist without some limitations on what the signs might be permitted to say.
It appears that it does exist without limitation. 41 CFR 102-74.385 reads in its entirety:
Persons in and on property must at all times comply with official
signs of a prohibitory, regulatory or directory nature and with the
lawful direction of Federal police officers and other authorized
individuals.