Posted by:
SuperCFL
(---.dsl.chcgil.sbcglobal.net)
Are you sure? Out in the unincorporated areas of the 'burbs they were an old boundary marker for the "Fire Protection District", the boundaries of the service territories for municipal fire departments. If you paid for fire protection from a nearby municipality, you were covered. If you didn't, you were beyond the boundaries and on your own.