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IBC 1603.3 Live loads posted

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IBC 160.3 states "Where the live loads for which each floor or portion thereof of a commercial or industrial building is or has been designed to exceed 50 psf, such design live loads shall be conspicuously posted by the owner in that part of each story in which they apply, using durable signs.  It shall be unlawful to remove or deface such notices."
Is this ever done?  What about any corridor or stair designed for 100psf -should they all be posted as such?  Maybe the Exit sign over the emergency exit stair should say Exit - 100psf.
And where are the load posting police?  "Unlawful"?  Can local authorities arrest a building owner for committing a crime if this isn't done? 
Wouldn't it be more important to post a low rating in an area where it would be expected to be high?  Such as an elevated platform designed for 40 psf with forktrucks driving around on it?  After all, bridge structures are only posted when they have limitations, not when they are up to code.
Just curious...
Jim Wilson, PE
Stroudsburg, PA

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