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Hoi Polloi wrote:Could it have been a privately owned building that was bought by the university who then didn't bother to remove the 30.06 warning?

I would suspect it is more than likely put there by someone at the University who doesn't know that they don't need 30.06 as they are off-limits anyway. We have the same thing at Plano schools; validly sized and worded signs at entrances to parking lots, but they are not valid because schools are government properties. They also post them at the entrances to some of the school buildings, but 30.06 is not valid there either, just the fact that premises (buildings) are off limits by statute.