Barricade 4
Barricade 4 : The effective screening of a building containing explosive materials from the magazine or another building, a railway, or a highway by a natural or an artificial barrier. A straight line from the top of any sidewall of the building containing explosive materials to the eaveline of any magazine or other building or to a point 12 ft (3660 mm) above the center of a railway or highway shall pass through such barrier
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