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BuckyWunderlick007 t1_j66cbx8 wrote

It’s not a Cambridge specific thing. That’s to tell fire fighters the structure is unoccupied, gutted and currently unsafe to enter.

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SheeEttin t1_j66dnsd wrote

Not necessarily gutted, but at least has something like big holes in the floor that a firefighter might fall through while searching for occupants in the smoke.

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BuckyWunderlick007 t1_j66khdw wrote

It means structurally deficient and unsafe for first responders to enter if you want to be specific about it.

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cherry-popsicle t1_j67b4b8 wrote

I’ve seen ones with just a single slash, not an X. Do they mean similar things?

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Master_Dogs t1_j69kyvd wrote

It's basically a caution sign. Firefighters can enter, but use caution.

An X is more severe. Firefighters should only enter if absolutely necessary, like to save a person inside. Otherwise firefighting occurs from the outside only.

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