Cost: 100 54 signs with various designs, such instance:
Unauthorized owner cannot enter; construction is on; there is a break-in; trees are being cut down; the J2 GC-Runway is closed; the J2 Walkway is closed; find an alternate route; and there is a gathering spot (in case of fire or similar).
There are other ways to raise the signage, including using your hands, a BigBag lifting hook, or pallet forks.
Each sign in the upper right section of the store has a description.

Thanks to FiteM123