Some car dealerships have 30.06 signs. There are interesting nuances. In one place they have non compliant signs. A shopping center in Austin as noncompliant 30.06 signs.
I think they have it both ways - it's posted to scare aware evil gun folks but they know if a person is caught it won't stand up.
There is a TX site with lists of locations and compliance. Hospital signs are usually compliant. But I'm going to the hospital to avoid dying, so it's not an issue.